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Table Of Contents
atm sig-traffic-shaping strict
Cisco IOS ATM Commands
This chapter presents the Cisco IOS ATM commands.
abr
To select available bit rate (ABR) quality of service (QoS) and configure the output peak cell rate and output minimum guaranteed cell rate for an ATM permanent virtual circuit (PVC) or virtual circuit (VC) class, use the abr command in the appropriate command mode. To remove the ABR parameters, use the no form of this command.
abr output-pcr output-mcr
no abr output-pcr output-mcr
Syntax Description
output-pcr
The output peak cell rate, in kilobits per second.
output-mcr
The output minimum guaranteed cell rate, in kilobits per second.
Defaults
ABR QoS at the maximum line rate of the physical interface.
Command Modes
Interface-ATM-VC configuration (for an ATM PVC)
VC-class configuration (for a VC class)
PVC range configuration (for an ATM PVC range)
PVC-in-range configuration (for an individual PVC within a PVC range)Command History
11.1
This command was introduced.
12.1(5)T
This command was modified to be available in PVC range and PVC-in-range configuration modes.
Usage Guidelines
If the abr command is not explicitly configured on an ATM PVC, the VC inherits the following default configuration (listed in order of precedence):
•
Configuration of any QoS command (abr, ubr, ubr+, or vbr-nrt) in a VC class assigned to the PVC itself.
•
•
•
ABR is a quality of service class defined by the ATM Forum for ATM networks. ABR is used for connections that do not require timing relationships between source and destination. ABR provides no guarantees in terms of cell loss or delay, providing only best-effort service. Traffic sources adjust their transmission rate in response to information they receive describing the status of the network and its capability to successfully deliver data.
In ABR transmission, the peak cell rate (PCR) specifies the maximum value of the allowed cell rate (ACR), and minimum cell rate (MCR) specifies the minimum value for the ACR. ACR varies between the MCR and the PCR and is dynamically controlled using congestion control mechanisms.
Examples
The following example specifies the output-pcr argument to be 100,000 kbps and the output-mcr argument to be 3000 kbps for an ATM PVC:
pvc 1/32abr 100000 3000Related Commands
atm aal aal3/4
To enable support for ATM adaptation layer 3/4 (AAL3/4) on an ATM interface, use the atm aal aal3/4 command in interface configuration mode. To disable support for AAL3/4 on an ATM interface, use the no form of this command.
atm aal aal3/4
no atm aal aal3/4
Syntax Description
This command has no arguments or keywords.
Defaults
Support for AAL3/4 is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on Cisco 7500 series routers with ATM Interface Processor (AIP). This command is not supported on the ATM port adapter. Because Cisco 4500 and Cisco 4700 routers always support both AAL3/4 and AAL5, this command is not required on Cisco 4500 and Cisco 4700 routers.
Only one virtual circuit can exist on a subinterface that is being used for AAL3/4 processing, and that virtual circuit must be an AAL3/4 virtual circuit.
The AAL3/4 support feature requires static mapping of all protocols except IP.
Examples
The following example enables AAL3/4 on ATM interface 2/0:
interface atm2/0ip address 172.21.177.178 255.255.255.0atm aal aal3/4Related Commands
atm abr rate-factor
To configure the amount by which the cell transmission rate increases or decreases in response to flow control information from the network or destination for available bit rate (ABR) virtual circuits (VCs), use the atm abr rate-factor command in interface configuration mode. To return to the default, use the no form of this command.
atm abr rate-factor [rate-increase-factor] [rate-decrease-factor]
no atm abr rate-factor [rate-increase-factor] [rate-decrease-factor]
Syntax Description
Defaults
ABR rate increase and decrease factor is 16.
Command Modes
Interface configuration
Command History
Usage Guidelines
To configure an ABR VC, use the pvc command with the abr keyword.
To verify the ABR rate factor, use the show atm interface atm EXEC command.
Examples
The following example sets the ABR rate factor to 32 for the next cell transferred on ATM interface 4/0:
interface atm 4/0atm abr rate-factor 32 32Related Commands
pvc
Configures the PVC interface.
show atm interface atm
Displays ATM-specific information about an ATM interface.
atm-address
To override the control ATM address of a Multiprotocol over ATM client (MPC) or a Multiprotocol over ATM server (MPS), use the atm-address command in interface configuration mode. To revert to the default address, use the no form of this command.
atm-address atm-address
no atm-address
Syntax Description
Defaults
The default is an automatically generated ATM address.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command specifies the control ATM address that an MPC or MPS should use when it comes up if it is associated with a hardware interface.
The atm-address command overrides the default operational control address of the MPC or MPS. When this address is deleted (using the no form of the command), the MPC or MPS uses an automatically generated address as its control address.
Examples
The following example shows how to specify the ATM address for an MPC:
Router(config-if)# atm-address 47.0091810000000061705b7701.00400BFF0011.00The following example shows how to specify the ATM address for an MPS:
Router(config-if)# atm-address 47.0091810000000061705C2B01.00E034553024.00atm address-registration
To enable the router to engage in address registration and callback functions with the Interim Local Management Interface (ILMI), use the atm address-registration command in interface configuration mode. To disable ILMI address registration functions, use the no form of this command.
atm address-registration
no atm address-registration
Syntax Description
This command has no arguments or keywords.
Defaults
Enabled
Command Modes
Interface configuration
Command History
Usage Guidelines
This command enables a router to register its address with the ILMI for callback when specific events occur, such as incoming Simple Network Management Protocol (SNMP) traps or incoming new network prefixes.
Examples
The following example enables ATM interface 1/0 to register its address:
interface atm 1/0atm address-registrationRelated Commands
atm arp-server
To identify an ATM Address Resolution Protocol (ARP) server for the IP network or set time-to-live (TTL) values for entries in the ATM ARP table, use the atm arp-server command in interface configuration mode. To remove the definition of an ATM ARP server, use the no form of this command.
atm arp-server [self | nsap nsap-address] [time-out minutes]
no atm arp-server [self [time-out minutes] | [nsap nsap-address]]
Syntax Description
Defaults
The default timeout value is 20 minutes.
The ARP server process is disabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
If an NSAP address is specified, the ARP client on this interface uses the specified host as an ARP server. You can specify multiple ATM ARP servers by repeating the command. If self is specified, this interface acts as the ARP server for the logical IP network.
The ATM ARP server takes one of the following actions if a destination listed in the server's ARP table expires:
•
•
This implementation follows RFC 1577, Classical IP over ATM.
To configure redundant ARP servers, you must first enable redundant ARP server support by entering the atm classic-ip-extensions command with the BFI keyword.
Examples
The following example configures ATM on an interface and configures the interface to function as the ATM ARP server for the IP subnetwork:
interface atm 0/0ip address 10.0.0.1.255.0.0.0atm nsap-address ac.1533.66.020000.0000.0000.0000.0000.0000.0000.00atm rate-queue 1 100atm maxvc 1024atm pvc 1 0 5 qsaalatm arp-server selfRelated Commands
atm classic-ip-extensions
Enables support for redundant ATM ARP servers on a single LIS.
atm classic-ip-extensions
To enable support for redundant ATM Address Resolution Protocol (ARP) servers on a single logical IP subnetwork (LIS), use the atm classic-ip-extensions command in interface configuration mode. To remove support for redundant ATM ARP servers, use the no form of this command.
atm classic-ip-extensions {BFI | none}
no atm classic-ip-extensions
Syntax Description
BFI
Enables simple redundant ARP server support. BFI as an acronym is undefined.
none
Enables standard RFC 1577 behavior (no redundant ARP server support).
Defaults
Redundant ATM ARP server support is not enabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
Cisco's implementation of the ATM ARP server supports redundant ATM ARP servers on a single logical IP subnetwork (LIS). In order for redundant ATM ARP server support to work, all of the devices on the LIS must be Cisco devices and must have the atm classic-ip-extensions BFI command configured.
The none keyword enables behavior that complies with RFC 1577, Classical IP over ATM. RFC 1577 does not support redundant ARP servers.
Examples
The following example shows how to configure redundant ARP servers on an ATM interface:
Router(config)# interface atm 1/0Router(config-if)# atm classic-ip-extensions BFIRouter(config-if)# atm arp-server nsap 47.000580FFE1000000F21A3167.666666666666.00Router(config-if)# atm arp-server nsap 47.000580FFE1000000F21A3167.555555555555.00Related Commands
atm arp-server
Identifies an ATM Address Resolution Protocol (ARP) server for the IP network or sets TTL values for entries in the ATM ARP table.
atm clock internal
To cause the ATM interface to generate the transmit clock internally, use the atm clock internal command in interface configuration mode. To restore the default value, use the no form of this command.
atm clock internal
no atm clock internal
Syntax Description
This command has no arguments or keywords.
Defaults
The ATM interface uses the transmit clock signal from the remote connection (the line). The switch provides the clocking.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is meaningless on a 4B/5B physical layer interface module (PLIM).
For SONET interfaces, use the atm clock internal command to configure an ATM port adapter to supply its internal clock to the line.
Examples
The following example causes the ATM interface to generate the transmit clock internally:
interface atm 4/0atm clock internalatm compression
To specify the software compression mode on an interface, use the atm compression command in interface configuration mode. To remove the compression mode setting, use the no form of this command.
atm compression {per-packet | per-interface | per-vc}
no atm compression {per-packet | per-interface | per-vc}
Syntax Description
Defaults
per-packet
Command Modes
Interface configuration
Command History
11.3(1)MA
This command was introduced on the Cisco MC3810 multiservice concentrator.
Usage Guidelines
This command applies to ATM configuration on the Cisco MC3810 multiservice concentrator.
Examples
The following example configures per-packet ATM compression:
interface atm0atm compression per-packetatm ds3-scramble
To enable scrambling of the ATM cell payload for the DS3 physical layer interface module (PLIM) on an ATM interface, use the atm ds3-scramble command in interface configuration mode. To disable scrambling of the ATM cell payload for the DS3 PLIM, use the no form of this command.
atm ds3-scramble
no atm ds3-scramble
Syntax Description
This command has no arguments or keywords.
Defaults
DS3 scrambling is not enabled.
Command Modes
Interface configuration
Command History
11.0
This command was introduced.
11.1
Command syntax was changed from ds3 scramble to atm ds3-scramble.
Usage Guidelines
DS3 scrambling is used to assist clock recovery on the receiving end.
Examples
The following example disables DS3 scrambling on the interface:
interface atm 4/0no atm ds3-scrambleatm e164 auto-conversion
To enable ATM E164 autoconversion, use the atm e164 auto-conversion command in interface configuration mode. To disable autoconversion, use the no form of this command.
atm e164 auto-conversion
no atm e164 auto-conversion
Syntax Description
This command has no arguments or keywords.
Defaults
E.164 auto conversion is not enabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
You must enable the ATM interface before using the atm e164 auto-conversion command.
When an interface is configured for E.164 auto conversion, ATM E.164 format addresses are converted to the corresponding native E.164 address for outgoing calls. For incoming calls, native E.164 addresses are converted to the corresponding ATM E.164 format.
Examples
The following example enables E.164 auto conversion on ATM interface 0/0/1:
interface atm 0/0/1atm e164 auto-conversionatm e3-scramble
To enable scrambling of the ATM cell payload for the E3 physical layer interface module (PLIM) on an ATM interface, use the atm e3-scramble command in interface configuration mode. To disable scrambling of the ATM cell payload for the E3 PLIM, use the no form of this command.
atm e3-scramble
no atm e3-scramble
Syntax Description
This command has no arguments or keywords.
Defaults
E3 scrambling is enabled.
Command Modes
Interface configuration
Command History
Usage Guidelines
E3 scrambling is used to assist clock recovery on the receiving end.
Examples
The following example disables E3 scrambling on the interface:
interface atm 2/0no atm e3-scrambleatm esi-address
To enter the end station ID (ESI) and selector byte fields of the ATM network service access point (NSAP) address, use the atm esi-address command in interface configuration mode. The NSAP address prefix is filled in via Integrated Local Management Interface (ILMI) from the ATM switch. To delete the end station address, use the no form of this command.
atm esi-address esi.selector
no atm esi-address esi.selector
Syntax Description
esi
End station ID field value in hexadecimal; 6 bytes long.
.selector
Selector field value in hexadecimal; 1 byte long. Dot is required as a separator.
Defaults
No ESI is defined.
Command Modes
Interface configuration
Command History
Usage Guidelines
The atm esi-address command allows you to configure the ATM address by entering the ESI (12 hexadecimal characters) and the selector byte (2 hexadecimal characters). The ATM prefix (26 hexadecimal characters) will be provided by the ATM switch. To get the prefix from the ATM switch, the ILMI permanent virtual circuit (PVC) must be configured on the router and the ATM switch must be able to supply a prefix via ILMI. A period must be used to separate the esi from the selector arguments.
Note
The ILMI PVC must be configured in order to get an NSAP address prefix from the switch.
Examples
The following example sets up the ILMI PVC and assigns the ESI and selector field values on the ATM interface 4/0:
interface atm 4/0atm pvc 2 0 16 ilmiatm esi-address 345678901234.12Related Commands
atm nsap-address
Sets the NSAP address for an ATM interface using SVC mode.
ilmi manage
Enables ILMI management on an ATM PVC.
pvc
Configures the PVC interface.
atm exception-queue
To set the exception queue length, use the atm exception-queue command in interface configuration mode. To restore the default value, use the no form of this command.
atm exception-queue number
no atm exception-queue
Syntax Description
Defaults
32 entries
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on ATM interface processor (AIP) for Cisco 7500 series routers. This command is not supported on the ATM port adapter for Cisco 7200 and 7500 series routers, nor is it supported on Cisco 4500 and Cisco 4700 routers.
The exception queue is used for reporting ATM events, such as cycle redundancy check (CRC) errors.
Examples
The following example sets the exception queue to 50 entries:
atm exception-queue 50atm framing (DS3)
To specify digital signal level 3 (DS3) line framing on an ATM interface, use the atm framing command in interface configuration mode. To return to the default C-bit with Physical Layer Convergence Protocol (PLCP) framing, use the no form of this command.
atm framing [cbitadm | cbitplcp | m23adm | m23plcp]
no atm framing [cbitadm | cbitplcp | m23adm | m23plcp]
Syntax Description
Defaults
cbitplcp
Command Modes
Interface configuration
Command History
11.0
This command was introduced.
11.1
This command was modified to include the Cisco 7200 series routers with the ATM-CES port adapter.
Usage Guidelines
This command is available on Cisco 4500 and 4700 routers with DS3 access speeds, Cisco 7200 series routers, and Cisco 7500 series routers.
Framing on the interface must match that on the switch for this ATM link.
Examples
The following example specifies M23 ADM framing on a router that has been set up with DS3 access to an ATM network:
interface atm 4/0atm framing m23admatm framing (E3)
To specify E3 line framing, use the atm framing command in interface configuration mode. To return to the default G.751 Physical Layer Convergence Protocol (PLCP) framing, use the no form of this command.
atm framing [g751adm | g832adm | g751plcp]
no atm framing [g751adm | g832adm | g751plcp]
Syntax Description
g751adm
(Optional) Specifies G.751 ATM direct mapping (ADM).
g832adm
(Optional) Specifies G.832 ATM direct mapping.
g751plcp
(Optional) Specifies G.751 PLCP encapsulation.
Defaults
g751plcp
Command Modes
Interface configuration
Command History
11.0
This command was introduced.
11.1
The g751plcp keyword was added, together with information on the Cisco 7200 series router with the ATM-CES port adapter.
Usage Guidelines
The default framing is described in the ITU-T Recommendation G.751.
Framing on the interface must match that on the switch for this ATM link.
Examples
The following example specifies G.832 ADM framing on a router that has been set up with E3 access to an ATM network:
interface atm 4/0atm framing g832admatm ilmi-keepalive
To enable Interim Local Management Interface (ILMI) keepalives, use the atm ilmi-keepalive command in interface configuration mode. To disable ILMI keepalives, use the no form of this command.
atm ilmi-keepalive [seconds]
no atm ilmi-keepalive [seconds]
Syntax Description
seconds
(Optional) Number of seconds between keepalives. Values less than 3 seconds are rounded up to 3 seconds, and there is no upper limit.
Defaults
3 seconds
Command Modes
Interface configuration
Command History
Examples
The following example enables ILMI keepalives for the ATM interface 1/0:
interface atm 1/0atm address-registrationatm ilmi-keepaliveRelated Commands
atm address-registration
Enables the router to engage in address registration and callback functions with the ILMI.
atm ilmi-pvc-discovery
To enable ATM permanent virtual circuit (PVC) discovery, use the atm ilmi-pvc-discovery command in interface configuration mode. To disable PVC discovery, use the no form of this command.
atm ilmi-pvc-discovery [subinterface]
no atm ilmi-pvc-discovery [subinterface]
Syntax Description
subinterface
(Optional) Causes discovered PVCs to be assigned to the ATM subinterface whose number matches the discovered PVC's VPI number.
Defaults
PVC discovery is not enabled.
Command Modes
Interface configuration
Command History
Examples
The following example enables PVC discovery on the ATM main interface 2/0. The subinterface keyword is used so that all discovered PVCs with a VPI value of 1 will be assigned to the subinterface 2/0.1:
interface atm 2/0pvc RouterA 0/16 ilmiexitatm ilmi-pvc-discovery subinterfaceexitinterface atm 2/0.1 multipointip address 172.21.51.5 255.255.255.0atm lbo
To specify the cable length (line build-out) for the ATM interface, use the atm lbo command in interface configuration mode. To return to the default, use the no form of this command.
atm lbo {long | short}
no atm lbo
Syntax Description
Defaults
short
Command Modes
Interface configuration
Command History
Examples
The following example specifies that the ATM interface uses a cable of up to 50 feet in length:
interface atm 4/0atm lbo shortRelated Commands
atm max-channels
To configure the number of transmit channels for the interface, use the atm max-channels command in interface configuration mode. To return to the default, use the no form of this command.
atm max-channels number
no atm max-channels
Syntax Description
number
Maximum number of transmit channels for the interface. The range is from 64 to 2048 channels. The default is 64 channels.
Defaults
64 channels
Command Modes
Interface configuration
Command History
Usage Guidelines
The atm max-channels command replaces the atm tx-channels command.
Transmit Descriptors
The atm max-channels command can be used to divide the available number (fixed) of transmit descriptors across the configured number of transmit channels. Typically, you think of a one-to-one association between a transmit channel and a VC; however, the ATM-CES port adapter supports other types of VCs than data VCs (for example CES VCs). Also, the ATM-CES port adapter can multiplex one or more VCs over a single virtual path (VP) that is shaped, and the VP only requires a single transmit channel. Therefore, the term transmit channel is used rather than virtual circuit.
Maximum Burst
The maximum burst of packets that are allowed per VC is limited by the number of transmit descriptors allocated per VC. Because the total number of transmit descriptors available is limited by the available SRAM space, configuration of the number of transmit channels for the interface determines the number of transmit descriptors for each transmit channel. Hence the burst size for each transmit channel is determined by the atm max-channels command. For example, for 64 (the default) transmit channels for the interface, 255 transmit descriptors are associated per channel, and for 512 transmit channels for the interface, 31 transmit descriptors are associated per channel.
To display information about the transmit descriptors, use the show atm interface atm command.
Examples
The following example sets the number of transmit descriptors for the interface to 120.
interface atm 2/0atm max-channels 120Related Commands
show atm interface atm
Displays ATM-specific information about an ATM interface.
atm maxvc
To set the ceiling value of the virtual circuit descriptor (VCD) on the ATM interface, use the atm maxvc command in interface configuration mode. To restore the default value, use the no form of this command.
atm maxvc number
no atm maxvc
Syntax Description
Defaults
2048 virtual circuits
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on Cisco 7500 series routers; it is not supported on the Cisco 4500 and Cisco 4700 routers, which have a fixed maximum of 1024 VCs.
This command sets the maximum value supported for the vcd argument in the atm pvc command. It also determines the maximum number of virtual circuits on which the AIP allows segmentation and reassembly (SAR) to occur. However, if you set a maxvc limit and then enter the atm pvc command with a larger value for the vcd argument, the software does not generate an error message.
This command does not affect the virtual path identifier (VPI)-virtual channel identifier (VCI) pair of each virtual circuit.
Examples
The following example sets a ceiling VCD value of 1024 and restricts the AIP to supporting no more than 1024 virtual circuits:
atm maxvc 1024Related Commands
atm mid-per-vc
To limit the number of message identifier (MID) numbers allowed on each virtual circuit, use the atm mid-per-vc command in interface configuration mode.
atm mid-per-vc maximum
Syntax Description
maximum
Number of MIDs allowed per virtual circuit on this interface. The values allowed are 16, 32, 64, 128, 256, 512, and 1024.
Defaults
16 MIDs per virtual circuit.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on Cisco 7200 and 7500 series routers.
MID numbers are used by receiving devices to reassemble cells from multiple sources into packets.
This command limits the number of discrete messages allowed on the PVC at the same time. It does not limit the number of cells associated with each message.
The maximum set by the atm mid-per-vc command overrides the range between the midhigh and midlow values set by the atm pvc command. If you set a maximum of 16 but a midlow of 0 and a midhigh of 255, only 16 MIDs (not 256) are allowed on the virtual circuit.
Examples
The following example allows 64 MIDs per ATM virtual circuit:
atm mid-per-vc 64Related Commands
atm multicast
To assign a Switched Multimegabit Data Service (SMDS) E.164 multicast address to the ATM subinterface that supports ATM adaptation layer 3/4 (AAL3/4) and SMDS encapsulation, use the atm multicast command in interface configuration mode.
atm multicast address
Syntax Description
Defaults
No multicast E.164 address is defined.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on Cisco 7500 series, Cisco 4500, and Cisco 4700 routers. This command is not supported on the ATM port adapter.
Each AAL3/4 subinterface is allowed only one multicast E.164 address. This multicast address is used for all protocol broadcast operations.
Examples
The following example assigns a multicast E.164 address to the ATM subinterface that is being configured:
atm multicast e180.0999.000Related Commands
atm multipoint-interval
To specify how often new destinations can be added to multipoint calls to an ATM switch in the network, use the atm multipoint-interval command in interface configuration mode. To return to the default interval, use the no form of this command.
atm multipoint-interval interval
no atm multipoint-interval interval
Syntax Description
Defaults
30 seconds
Command Modes
Interface configuration
Command History
Usage Guidelines
This command applies to switched virtual circuits (SVCs) only, not to permanent virtual circuits (PVCs).
This command has no effect unless ATM multipoint signaling is enabled on the interface.
Examples
The following example enables point-to-multipoint signaling on the ATM interface 2/0. It also specifies that new destinations can be added to multipoint calls every 60 seconds:
interface atm 2/0atm multipoint-signallingatm multipoint-interval 60Related Commands
atm multipoint-signalling
Enables point-to-multipoint signaling to the ATM switch.
atm multipoint-signalling
To enable point-to-multipoint signaling to the ATM switch, use the atm multipoint-signalling command in interface configuration mode. To disable point-to-multipoint signalling to the ATM switch, use the no form of this command.
atm multipoint-signalling
no atm multipoint-signalling
Syntax Description
This command has no arguments or keywords.
Defaults
Point-to-multipoint signaling is not enabled.
Command Modes
Interface configuration
Command History
11.0
This command was introduced.
11.1
Functionality was changed to allow this command on all subinterfaces, not just the main interface.
Usage Guidelines
If multipoint signaling is enabled, the router uses existing static map entries that have the broadcast keyword set to establish multipoint calls. One call is established for each logical subnet of each protocol.
All destinations are added to the call. One multicast packet is sent to the ATM switch for each multipoint call. The ATM switch replicates the packet to all destinations.
The atm multipoint-interval command determines how often new destinations can be added to a multipoint call.
Note
Examples
The following example enables point-to-multipoint signalling on the ATM interface 2/0:
interface atm 2/0atm multipoint-signallingRelated Commands
atm multipoint-interval
Specifies how often new destinations can be added to multipoint calls to an ATM switch in the network.
atm nsap-address
To set the network service access point (NSAP) address for an ATM interface using switched virtual circuit (SVC) mode, use the atm nsap-address command in interface configuration mode. To remove any configured address for the interface, use the no form of this command.
atm nsap-address nsap-address
no atm nsap-address
Syntax Description
Defaults
No NSAP address is defined for this interface.
Command Modes
Interface configuration
Command History
Usage Guidelines
When configuring an SVC, you must use the atm nsap-address command to define the source NSAP address. It identifies a particular port on the ATM network and must be unique across the network.
Note
Configuring a new address on the interface overwrites the previous address. The router considers the address as a string of bytes and will not prefix or suffix the address with any other strings or digits. The complete NSAP address must be specified, because this value is used in the Calling Party Address Information Element in the SETUP message to establish a virtual circuit.
ATM NSAP addresses have a fixed length of 40 hexadecimal digits. You must configure the complete address in the following dotted format:
xx.xxxx.xx.xxxxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx
Note
Examples
In the following example, the source NSAP address for the interface is AB.CDEF.01.234567.890A.BCDE.F012.3456.7890.1234.12:
atm nsap-address AB.CDEF.01.234567.890A.BCDE.F012.3456.7890.1234.12atm oam flush
To drop all current and future Operation, Administration, and Maintenance (OAM) cells received on an ATM interface, use the atm oam flush command in interface configuration mode. To receive OAM cells on an ATM interface, use the no form of this command.
atm oam flush
no atm oam flush
Syntax Description
This command has no arguments or keywords.
Defaults
Dropping of OAM cells is disabled.
Command Modes
Interface configuration
Command History
Examples
The following example drops all current and future OAM cells received on the ATM main interface with slot 0 and port 0:
interface atm 0/0atm oam flushatm oversubscribe
To disable bandwidth management for service categories other than constant bit rate (CBR), use the atm oversubscribe command in interface configuration mode. To enable bandwidth management, use the no form of the command.
atm oversubscribe
no atm oversubscribe
Syntax Description
This command has no arguments or keywords.
Command Default
The default is to allow as much bandwidth as possible with no upper limits (except on DSL ATM interfaces, in which oversubscription is a factor of 2). The no form of the atm oversubscribe command enables bandwidth management on any ATM interface you specify.
Command Modes
Interface configuration
Command History
12.0(3)T
This command was introduced.
12.4(6)T
Support for this command was added to DSL ATM interfaces.
Usage Guidelines
When you type the enabling command (the no version), a check determines if the ATM link is already oversubscribed. If so, the command is rejected. Otherwise, the total bandwidth available on the link is recorded and all future connection setup requests are monitored to ensure that the link is not oversubscribed.
The bandwidth allocated for each service category is displayed in the output of the show atm interface atm command.
The ATM bandwidth manager keeps track of bandwidth used by VCs on a per-interface basis. Because many services require guaranteed bandwidth (for variable bit rate-real time (VBR-RT), available bit rate (ABR), CBR, for instance), bandwidth management is required. The purpose of the bandwidth manager is to reserve resources for connections that require guaranteed services. Bandwidth management for CBR is turned on automatically for all interfaces supporting CBR. Bandwidth management for other service categories must be turned on by the user. All service categories outside CBR are monitored only if specifically requested.
Note
In all cases, bandwidth check for a PVC is done when the PVC is configured. Bandwidth check for a SVC is done when a signaling call is placed or received.
When you specify the atm pvp command, the system checks if the specified bandwidth is available on the interface. If the bandwidth available is greater than or equal to the peak rate specified for the Permanent Virtual Path (PVP), the command is accepted; otherwise the command is rejected.
Within the VC mode, the steps taken to check for bandwidth available are to ascertain if the bandwidth is already used by the VC to fulfill the request. If the VC being configured is a PVC and belongs to a PVP, the bandwidth available on the PVP is used for the check; otherwise the bandwidth available on the interface is used for the check.
When services within a VC class are being configured, the steps taken are to check if the new bandwidth requirement can be fulfilled for all VCs using the class (on a per-interface basis) by comparing with the bandwidth available on the corresponding interface.
Bandwidth checking for an SVC occurs before a SETUP message is sent for an outbound call. If the bandwidth check fails, the SETUP message is not sent. If the bandwidth check passes, the traffic class from which the service category is inherited is updated with the requirements for the new SVC.
When an SVC setup is requested for remotely initiated calls, a bandwidth check occurs as soon as the SETUP message is received. This bandwidth check has two components:
•
•
If the bandwidth check fails, a RELEASE message is sent out and the call is rejected. If the bandwidth check passes, resources are reserved for the VC and the call is accepted.
Examples
The following example displays the available bandwidth after you enter VC mode. Notice that the bandwidth is specified in kbps.
Router#show atm interface atm 2/0Interface ATM2/0:AAL enabled: AAL5, Maximum VCs:1024, Current VCCs:5Maximum Transmit Channels:64Max. Datagram Size:4496PLIM Type:SONET - 155Mbps, TX clocking:LINECell-payload scrambling:OFFsts-stream scrambling:ON877 input, 120843834 output, 0 IN fast, 20 OUT fastABR parameters, rif:16 rdf:16, 0 out dropBandwidth distribution :CBR :16000 Avail bw = 139000Config. is ACTIVENotice that the bandwidth is specified as 139000 kbps.
Related Commands
atm oversubscribe factor
To set up finite line bandwidth oversubscription for digital subscriber line (DSL), use the atm oversubscribe factor command in interface configuration mode. To disable finite line bandwidth oversubscription for DSL, use the no form of this command.
atm oversubscribe factor factor
no atm oversubscribe factor factor
Syntax Description
Command Default
Finite line bandwidth oversubscription for DSL is disabled.
Command Modes
Interface configuration
Command History
12.4(2)XA
This command was introduced.
12.4(6)T
This command was integrated into Cisco IOS Release 12.4(6)T.
Usage Guidelines
Resource limitations on Cisco xDSL interfaces require a way to configure bandwidth oversubscription up to a defined bandwidth (a finite oversubscription of bandwidth). For this requirement, the atm oversubscribe factor command is used. A DSL ATM interface supports only an oversubscribe factor of 2.
Oversubscription is allowed on variable bit rate real time class (VBR-rt), variable bit rate non-real time class (VBR-nrt), and unspecified bit rate plus (UBR+) permanent virtual circuits (PVCs). With oversubscription enabled, multiple VBR-rt, VBR-nrt, and UBR+ PVCs can be configured even when the sum of their sustainable cell rates (SCRs) exceeds the actual bandwidth available over the physical line. For example, if oversubscription is enabled and an oversubscription factor of 2 is set for a line rate of 2304 kbps, the sum of SCRs and minimum desired cell rates of VBR-rt, VBR-nrt, and UBR+ PVCs must be less than or equal to 4608 kbps, excluding the constant bit rate (CBR) PVC bandwidth.
An oversubscription factor of 2 is used internally; that is, VBR and UBR+ PVCs with a sum of SCRs up to twice the current line rate are valid. If you configure VBR-rt, VBR-nrt, or UBR+ for more than the configured oversubscription factor, the PVCs will be configured when bandwidth is available. But when no oversubscription bandwidth is available, a PVC is downgraded to an unspecified bit rate (UBR) (CBR PVCs are not affected, however); in this state, if you try to configure VBR or UBR+ PVCs beyond the line rate, the new PVCs will be downgraded to UBR state. If you have no oversubscription configured, each virtual circuit (VC) receives up to its configured SCR value of traffic, and VCs with higher SCR values receive more bandwidth. For example, if VC1 is a VBR-rt PVC configured with peak cell rate (PCR) and SCR line rates of 2304 kbps (command vbr-rt 2304 2304), VC2 is a VBR-nrt PVC configured with PCR and SCR line rates of 2000 kbps (command vbr-nrt 2000 2000), and VC3 has PCR and SCR line rates of 496 kbps (command vbr-rt 496 496), then when no oversubscription bandwidth is available, VC1 and VC 2 are configured with the specified PCR and SCR line rates, but VC3 is downgraded to UBR class.
If the DSL line rate goes down and comes back up with less than the trained rate (based on the trained bandwidth PVCs) and no bandwidth is left, some PVCs might be downgraded to UBR class.
The value of the oversubscription factor determines the maximum bandwidth that is configured, which is the sum of SCRs for all VBR-rt, VBR-nrt, and UBR+. PVCs. To disable oversubscription, the total configured bandwidth of CBR, VBR-rt, VBR-nrt, and UBR+ must not exceed actual trained bandwidth. The CBR bandwidth is counted when disabling oversubscription.
With oversubscription disabled, a PVC can be configured only up to the line rate. For example, if the line rate is 2304 kbps, the SCR or PCR of a VBR PVC cannot be more than 2304 kbps (assuming there are no other PVCs). If there is another PVC, such as a CBR PVC with a PCR of 500 kbps, that line rate is subtracted, and the maximum SCR or PCR allowed on the VBR PVC is 1804 kbps.
The first time VBR-rt, VBR-nrt, or UBR+ PVCs are configured with the oversubscription factor enabled, the available bandwidth is checked. If the required bandwidth is available, the service class commands (vbr-rt, vbr-nrt, and ubr+) are accepted. If there is not enough requested bandwidth, the service class commands are rejected, and the PVC state will be UP with service class set to UBR.
After VBR-rt, VBR-nrt, or UBR+ PVCs are configured, a dynamic line rate modification occurs when the atm oversubscribe factor command is enabled. The available bandwidth is checked, and if the required amount is available, the PVC state will be UP with the configured service class. If there is not enough bandwidth, the PVC state will be UP with service class UBR.
DSL ATM interfaces do not support switched virtual circuits (SVCs).
Examples
The following example shows how to set oversubscription on the link by a factor of 2.
interface ATM0/0no ip addressatm oversubscribe factor 2no atm ilmi-keepalivepvc 2/100vbr-nrt 2304 2304 1!pvc 3/100cbr 2304!pvc 4/100ubr+ 2304 2304!pvc 5/100!The oversubscription configuration can be verified by using the show atm interface EXEC command. The report from the command indicates that the link is oversubscribed by 4608 kbps.
Router# show atm interface atm 0/0Interface ATM0/0:AAL enabled: AAL5 , Maximum VCs: 23, Current VCCs: 4VCIs per VPI: 256,Max. Datagram Size: 4528PLIM Type: GSHDSL - 2304Kbps, Framing is Unknown,, TX clocking: LINE0 input, 0 output, 0 IN fast, 0 OUT fastCBR : 2304 UBR+ : 2304 VBR-NRT : 2304Link oversubscribed by 4608 kbpsConfig. is ACTIVERelated Commands
atm pppatm passive
To place an ATM subinterface in passive mode, use the atm pppatm passive command in ATM subinterface configuration mode. To change the configuration back to the default (active) mode, use the no form of this command.
atm pppatm passive
no atm pppatm passive
Syntax Description
This command has no arguments or keywords.
Defaults
Active mode
Command Modes
ATM subinterface configuration
Command History
Usage Guidelines
The atm pppatm passive command places PPP over ATM (PPPoA) sessions on an ATM subinterface in "listening" mode. Rather than trying to establish the sessions actively by sending out Link Control Protocol (LCP) packets, these sessions listen to the incoming LCP packets and become active only after they have received their first LCP packet. This feature is useful for L2TP access concentrators (LACs) in the broadband access deployments where thousands of PPPoA sessions are configured on LACs. When PPPoA is in the passive mode, the LAC will bring up the sessions only when the subscribers become active and not waste its processing power on polling all the sessions.
For better scalability and faster convergence of PPP sessions, Cisco recommends setting the PPPoA sessions to passive mode at the LAC.
Examples
The following example configures the passive mode for the PPPoA sessions on an ATM subinterface:
interface atm 1/0.1 multipointatm pppatm passiverange range-pppoa-1 pvc 100 199protocol ppp virtual-template 1atm pvp
To create a permanent virtual path (PVP) used to multiplex (or bundle) one or more virtual circuits (VCs), use the atm pvp command in interface configuration mode. To remove a PVP, use the no form of this command.
atm pvp vpi [peak-rate]
no atm pvp vpi
Syntax Description
Defaults
PVP is not configured.
The default peak-rate is the line rate.Command Modes
Interface configuration
Command History
Usage Guidelines
This command is commonly used to create a PVP that is used multiplex circuit emulation service (CES) and data VCs.
The ATM-CES port adapter supports multiplexing of one or more VCs over a virtual path that is shaped at a constant bandwidth. For example, you can buy a virtual path service from an ATM service provider and multiplex both the CES and data traffic over the virtual path.
All subsequently created VCs with a vpi argument matching the vpi specified with the atm pvp command are multiplexed onto this PVP. This PVP connection is an ATM connection where switching is performed on the VPI field of the cell only. A PVP is created and left up indefinitely. All VCs that are multiplexed over a PVP share and are controlled by the traffic parameters associated with the PVP.
Changing the peak-rate argument causes the ATM-CES port adapter to go down and then back up.
When you create a PVP, two VC are created (VCI 3 and 4) by default. These VCs are created for VP end-to-end loopback and segment loopback OAM support.
To verify the configuration of a PVP, use the show atm vp command in EXEC mode.
Examples
The following example creates a permanent virtual path with a peak rate of 2000 kbps. The subsequent VC created are multiplexed onto this virtual path.
interface atm 6/0atm pvp 1 2000atm pvc 13 1 13 aal5snapexitinterface cbr 6/1ces circuit 0ces pvc 9 interface atm6/0 vpi 1 vci 100exitRelated Commands
show atm vp
Displays the statistics for all VPs on an interface or for a specific VP.
atm rate-queue
To create a permanent rate queue or specify a rate queue tolerance, use the atm rate-queue command in interface configuration mode. To remove a rate queue or rate queue tolerance, use the no form of this command.
atm rate-queue {queue-number speed | tolerance svc [pvc] tolerance-value [strict]}
no atm rate-queue {queue-number speed | tolerance svc [pvc] tolerance-value [strict]}
Syntax Description
Defaults
No rate queue is defined. The default rate-queue tolerance for SVCs and discovered VCs is 10. For PVCs, it is 0.
Command Modes
Interface configuration
Command History
10.0
This command was introduced.
11.3
The following keywords were added:
•
•
Usage Guidelines
If a PVC or SVC is created, and its rate queue does not match a permanent rate queue that was created using the atm-rate queue queue-number speed command, one of the following will occur:
•
•
If you do not create permanent rate queues or if you create PVCs with peak or average rates that are not matched by the rate queues you configure, the software dynamically creates rate queues as necessary to satisfy the requests of the atm pvc commands.
You can create multiple rate queues. A warning message appears if all rate queues are deconfigured or if the combined rate queues exceed the PLIM rate.
Examples
The following example configures a permanent rate queue with a queue-number of 1 and a speed of
100 Mbps:atm rate-queue 1 100The following example configures a rate queue with a tolerance-value of 20, which will apply to SVCs, discovered VCs, and PVCs.
interface atm 2/0atm rate-queue tolerance svc pvc 20Related Commands
pvc
Configures the PVC interface.
svc
Creates an ATM SVC and specifies the destination NSAP address on a main interface or subinterface.
atm rawq-size
To define the ATM Interface Processor (AIP) raw-queue size, use the atm rawq-size command in interface configuration mode. To restore the default value, use the no form of this command.
atm rawq-size number
no atm rawq-size
Syntax Description
number
Maximum number of cells in the raw queue simultaneously. Range is from 8 to 256. Default is 32.
Defaults
32 cells
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on the Cisco 7200 and 7500 series routers, but not on the Cisco 4500 and Cisco 4700 routers.
The raw queue is used for raw ATM cells, which include Operation, Administration, and Maintenance (OAM) (F4 and F5) and Interim Local Management Interface (ILMI) cells.
Examples
The following example allows a maximum of 48 cells in the raw queue:
atm rawq-size 48atm rxbuff
To set the maximum number of receive buffers for simultaneous packet reassembly, use the atm rxbuff command in interface configuration mode. To restore the default value, use the no form of this command.
atm rxbuff number
no atm rxbuff
Syntax Description
number
Maximum number of packet reassemblies that the ATM Interface Processor (AIP) can perform simultaneously. Range is from 0 to 512. Default is 256.
Defaults
256 packet reassemblies
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on AIP for Cisco 7500 series routers. This command is not supported on the ATM port adapter for Cisco 7200 and 7500 series routers, nor is it supported on Cisco 4500 and Cisco 4700 routers.
Examples
The following example allows the AIP to perform a maximum of 300 packet reassemblies simultaneously:
atm rxbuff 300atm sig-traffic-shaping strict
To specify that a switched virtual circuit (SVC) should be established on an ATM interface only if shaping can be done in accordance with the signaled traffic parameters, use the atm sig-traffic-shaping strict command in interface configuration mode. To disable strict traffic shaping, use the no form of this command.
atm sig-traffic-shaping strict
no atm sig-traffic-shaping strict
Syntax Description
This command has no arguments or keywords.
Defaults
The default value is lenient (not strict) traffic shaping for SVCs.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on the Cisco 7500 series routers, Cisco 4500 routers, and Cisco 4700 routers. This command is not supported on the ATM port adapter.
If strict traffic shaping is configured on the router ATM interface, then an SVC is established only if traffic shaping can be provided for the transmit cell flow according to the signaled traffic parameters. If such shaping cannot be provided, the SVC is released.
If strict traffic shaping is not configured on the router ATM interface, an attempt is made to establish an SVC with traffic shaping for the transmit cell flow according to the signaled traffic parameters. If such shaping cannot be provided, the SVC is installed with default shaping parameters (it behaves as though a permanent virtual circuit (PVC) were created without specifying traffic parameters).
The signalling SETUP message carries the forward and backward traffic parameters. For connections initiated by the source router, traffic is shaped to the SETUP message forward parameters. For connections initiated by another router or host, traffic is shaped to the backward parameters.
Examples
The following example allows an SVC to be established on an ATM interface using only signaled traffic parameters:
atm sig-traffic-shaping strictatm smds-address
To assign a unicast E.164 address to the ATM subinterface that supports ATM adaptation layer 3/4 (AAL3/4) and Switched Multimegabit Data Service (SMDS) encapsulation, use the atm smds-address command in interface configuration mode.
atm smds-address address
Syntax Description
Defaults
No E.164 address is assigned.
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on Cisco 7500 series routers, Cisco 4500 routers, and Cisco 4700 routers. This command is not supported on the ATM port adapter.
Each AAL3/4 subinterface is allowed only one unicast E.164 address.
Examples
The following example assigns a unicast E.164 address to the ATM subinterface that is being configured:
atm smds-address c141.555.1212Related Commands
atm sonet stm-1
To set the mode of operation and thus control type of ATM cell used for cell-rate decoupling on the SONET physical layer interface module (PLIM), use the atm sonet stm-1 command in interface configuration mode. To restore the default Synchronous Transport Signal level 3, concatenated (STS-3c) operation, use the no form of this command.
atm sonet stm-1
no atm sonet stm-1
Syntax Description
This command has no arguments or keywords.
Defaults
STS-3c
Command Modes
Interface configuration
Command History
Usage Guidelines
Use STM-1 in applications where the ATM switch requires "idle cells" for rate adaptation. An idle cell contains 31 zeros followed by a one. STM-1 is defined as a Synchronous Digital Hierarchy/Synchronous Transport Signal level 1 (SDH/STM-1) operation (ITU-T specification).
Use the default (STS-3c) in applications where the ATM switch requires "unassigned cells" for rate adaptation. An unassigned cell contains 32 zeros.
Examples
The following example specifies ATM SONET STM-1:
atm sonet stm-1atm svc-upc-intent
To change the intended usage parameter control (UPC) mode that is to be used on the cell flow received into the switch fabric for switched virtual circuits (SVCs) or destination legs of soft permanent virtual circuits (PVCs) on an interface, use the atm svc-upc-intent command in interface configuration mode. Any change in this parameter is applied to SVCs or soft PVCs subsequently established on the interface. To assign the default value to the parameter, use the no form of this command.
atm svc-upc-intent [abr | cbr | vbr-rt | vbr-nrt | ubr] {tag | pass | drop}
no atm svc-upc-intent
Syntax Description
Defaults
pass
Command Modes
Interface configuration
Command History
Usage Guidelines
This configuration parameter determines the UPC to use for SVCs and for the destination leg of soft VC and VP. If policing is desired, it should be applied once for traffic entering a network.
Examples
In the following example, the intended UPC for SVCs on an interface is set to tagging:
Router(config-if)# atm svc-upc-intent tagIn the following example, the UBR traffic on an interface is passed while all other traffic is policed:
Router(config-if)# atm svc-upc-intent ubr passRouter(config-if)# atm svc-upc-intent cbr tagRouter(config-if)# atm svc-upc-intent vbr-rt tagRouter(config-if)# atm svc-upc-intent vbr-nrt tagRouter(config-if)# atm svc-upc-intent abr dropRelated Commands
atm txbuff
To set the maximum number of transmit buffers for simultaneous packet fragmentation, use the atm txbuff command in interface configuration mode. To restore the default value, use the no form of this command.
atm txbuff number
no atm txbuff
Syntax Description
number
Maximum number of packet fragmentations that the ATM Interface Processor (AIP) can perform simultaneously. Range is from 0 to 512. Default is 256.
Defaults
256
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on the AIP for Cisco 7500 series routers. This command is not supported on the ATM port adapter for Cisco 7200 and 7500 series routers, nor is it supported on Cisco 4500 and Cisco 4700 routers.
Examples
The following example configures the AIP to perform up to 300 packet fragmentations simultaneously:
atm txbuff 300atm uni-version
To specify the User-Network Interface (UNI) version (3.0 or 3.1) the router should use when Interim Local Management Interface (ILMI) link autodetermination is unsuccessful or ILMI is disabled, use the atm uni-version command in interface configuration mode. To restore the default value to 3.0, use the no form of this command.
atm uni-version version-number
no atm uni-version version-number
Syntax Description
Defaults
Version 3.0
Command Modes
Interface configuration
Command History
Usage Guidelines
Normally, when the ILMI link autodetermination is enabled on the interface and is successful, the router accepts the UNI version returned by ILMI. If the ILMI link autodetermination is unsuccessful or ILMI is disabled, the UNI version defaults to 3.0. You can override the default UNI version by using this command to enable UNI 3.1 signalling support. The no form of the command sets the UNI version to one returned by ILMI if ILMI is enabled and the link autodetermination process is successful. Otherwise, the UNI version reverts to 3.0.
Examples
The following example specifies UNI version 3.1 signaling port on the ATM interface 2/0:
interface atm 2/0atm uni-version 3.1atm vc-per-vp
To set the maximum number of virtual channel identifier (VCIs) to support per virtual path identifier (VPI), use the atm vc-per-vp interface configuration command. To restore the default value, use the no form of this command.
atm vc-per-vp number
no atm vc-per-vp
Syntax Description
Defaults
1024
Command Modes
Interface configuration
Command History
Usage Guidelines
This command controls the memory allocation in the ATM Interface Processor (AIP), ATM port adapter, ATM network module, or network processor module (NPM) to deal with the VCI table. It defines the maximum number of VCIs to support per VPI; it does not bound the VCI numbers.
An invalid VCI causes a warning message to be displayed.
Cisco 2600 and 3600 Series with IMA
Note
Table 1 lists the possible VCI ranges and corresponding VPI ranges for the Cisco 2600 and 3600 series with IMA.
Table 1 VCI and VPI Ranges for Cisco 2600 and 3600 Series with IMA
0-255
0-15, 64-79, 128-143, and 192-207
0-511
0-15, 64-79
0-1023
0-15
Examples
The following example sets the maximum number of VCIs per VPI to 512:
atm vc-per-vp 512Related Commands
atm vp-filter
To set the ATM Interface Processor (AIP) filter register, use the atm vp-filter command in interface configurationmode. To restore the default value, use the no form of this command.
atm vp-filter hexvalue
no atm vp-filter
Syntax Description
Defaults
0x7B
Command Modes
Interface configuration
Command History
Usage Guidelines
This command is supported on Cisco 7500 series routers, but not on Cisco 4500 and Cisco 4700 routers. This command is not supported on ATM port adapters.
This command allows you to specify a virtual path identifier (VPI) or range of VPIs to be used for ATM adaptation layer 3/4 (AAL3/4) processing. All other VPIs map to AAL5 processing. If only AAL5 processing is required, you can either let the virtual path filter default or set it to an arbitrary VPI so that AAL5 processing is performed on all VPIs.
This command configures the hexadecimal value used in the virtual path filter register in the reassembly operation. The virtual path filter comprises 16 bits. The virtual path filter register uses the most significant bits (bits 15 through 8, the left half of the filter) as mask bits, and uses bits 7 through 0 (the right half of the filter) as compare bits.
When a cell is received, the right half of the filter is exclusively NORed with the binary value of the incoming VPI. The result is then ORed with the left half of the filter (the mask). If the result is all ones, reassembly is done using the VCI/message identifier (MID) table (AAL3/4 processing). Otherwise, reassembly is done using the VPI-VCI pair table (AAL5 processing).
Examples
In the following example, all incoming cells are reassembled using AAL3/4 processing:
atm vp-filter ff00In the following example, all incoming cells with the virtual path equal to 0 are reassembled using AAL3/4 processing; all other cells are reassembled using AAL5 processing:
atm vp-filter 0In the following example, all incoming cells with the most significant bit of the virtual path set are reassembled using AAL3/4 processing; all other cells are reassembled using AAL5 processing:
atm vp-filter 7f80atmsig close atm
To disconnect a switched virtual circuit (SVC), use the atmsig close atm command in EXEC mode.
AIP on Cisco 7500 series; ATM, ATM-CES, Enhanced ATM Port Adapter on Cisco 7200 Series; 1-port ATM-25 Network Module on Cisco 2600 and 3600 Series
atmsig close atm slot/port vcd
ATM and Enhanced ATM Port Adapter on Cisco 7500 series
atmsig close atm slot/port-adapter/port vcd
NPM on Cisco 4500 and Cisco 4700
atmsig close atm number vcd
Syntax Description
Command Modes
EXEC
Command History
Usage Guidelines
Execute this command if you want to close a particular SVC. Because virtual circuits are numbered per interface, you must specify the ATM interface by its slot number.
Examples
The following example closes SVC 2 on ATM interface 4/0:
atmsig close atm4/0 2
Posted: Thu Feb 8 14:27:27 PST 2007
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