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This section describes the function and displays the syntax of each X.25 and LAPB command. For more information about defaults and usage guidelines, see the corresponding chapter of the Router Products Command Reference publication.
bfe {enter | leave} interface-type number
Use the bfe EXEC command to allow the router to participate in emergency mode or to end participation in emergency mode when the interface is configured for x25 bfe-emergency decision and x25 bfe-decision ask.
| enter | Causes the router to send a special address translation packet that includes an enter emergency mode command to the BFE if the emergency mode window is open. If the BFE is already in emergency mode, this command enables the sending of address translation information. |
| leave | Disables the sending of address translation information from the router to the BFE when the BFE is in emergency mode. |
| interface-type | Interface name. |
| number | Interface number. |
clear x25-vc interface-name number [lcn]
Use the clear x25-vc privileged EXEC command to clear switched virtual circuits (SVCs) and to reset permanent virtual circuits (PVCs). This command without an lcn argument clears all X.25 virtual circuits at once by restarting the packet layer service.
| interface-name | Name of the interface |
| number | Interface unit number |
| lcn | (Optional) Virtual circuit |
Use the cmns enable interface configuration command to enable Connection-Mode Network Service (CMNS) on a nonserial interface. Use the no cmns enable command to disable this capability.
Use the encapsulation bfex25 interface configuration command to configure BFE encapsulation on a router attached to a BFE device.
The default serial encapsulation is HDLC. You must choose an X.25 encapsulation method.
A router using DDN X.25 Standard Service can act as either a DTE or a DCE device. Use the encapsulation ddnx25 interface configuration command to set DTE DDN X.25 operation.
The default serial encapsulation is HDLC. You must choose an X.25 encapsulation method.
A router using DDN X.25 Standard Service can act as either a DTE or a DCE device. Use the encapsulation ddnx25-dce interface configuration command to set DCE DDN X.25 operation. The default serial encapsulation is HDLC. You must choose an X.25 encapsulation method.
Use the encapsulation lapb interface configuration command to exchange datagrams over a serial interface using LAPB encapsulation and operating as the DTE. One end of the link must be DTE and the other end must be DCE. The default serial encapsulation is HDLC. You must choose a LAPB encapsulation method.
Use the encapsulation lapb-dce interface configuration command to exchange datagrams over a serial interface using LAPB encapsulation and operating as the DCE. One end of the link must be DTE and the other end must be DCE. The default serial encapsulation is HDLC. You must choose a LAPB encapsulation method.
For DTE operation, use the encapsulation multi-lapb interface configuration command to use multiple local-area network (LAN) protocols on the same line at the same time. The default serial encapsulation is HDLC. You must choose a LAPB encapsulation method.
For DCE operation, use the encapsulation multi-lapb-dce interface configuration command to enable use of multiple LAN protocols on the same line at the same time. The default serial encapsulation is HDLC. You must choose a LAPB encapsulation method.
A router using X.25 Level 3 can act as a DTE or DCE device. Use the encapsulation x25 interface configuration command to set X.25 DTE operation. The default serial encapsulation is HDLC. You must choose an X.25 encapsulation method.
A router using X.25 Level 3 can act as a DTE or DCE device. Use the encapsulation x25-dce interface configuration command to set X.25 DCE operation. The default serial encapsulation is HDLC. You must choose an X.25 encapsulation method.
[no] ip tcp header-compression [passive]
Use the ip tcp header-compression interface configuration command to implement TCP header compression. The header compression complies with the IETF RFC 1144 standard. The no ip tcp header-compression command disables this feature.
| passive | (Optional) Outgoing packets are compressed only if incoming TCP packets on the virtual circuit (VC) for a TCP header compression map are compressed. When the passive option is not set, all compressible traffic intended for the TCP header compression address map is compressed. |
lapb hold-queue queue-size
[no] lapb hold-queue [queue-size]
Use the lapb hold-queue interface configuration command to define the number of frames that can be held while LAPB is unable to send. Use the no lapb hold-queue command without an argument to remove this command from the configuration file and return to the default value.
| queue-size | Number of frames. A hold queue limit of 0 allows an unlimited number of frames in the hold queue. The default is 10 frames for LAPB encapsulation; X25 encapsulation may not set this parameter because proper operation requires that LAPB send all requested frames. |
Use the lapb k interface configuration command to specify the maximum permissible number of outstanding frames, called the window size.
| window-size | Frame count. It can be a value from 1 to 7. The default is 7. |
Use the lapb n1 interface configuration command to specify the maximum number of bits a frame can hold (the LAPB N1 parameter).
| bits | Number of bits from 1088 through 32832; it must be a multiple of eight. The default is 12056 bits (1507 bytes total, or 1503 bytes of user information). |
Use the lapb n2 interface configuration command to specify the maximum number of times a data frame can be transmitted (the LAPB N2 parameter).
| tries | Transmission count. It can be a value from 1 through 255. The default is 20 transmissions. |
Use the lapb protocol interface configuration command to configure the protocol carried on the LAPB line.
| protocol | Protocol. It can be one of the following: ip, xns, decnet, appletalk, vines, clns (ISO CLNS), ipx (Novell IPX), and apollo. The default is IP. |
Use the lapb t1 interface configuration command to set the retransmission timer period (the LAPB T1 parameter).
| milliseconds | Time in milliseconds. It can be a value from 1 through 64000. The default is 3000 milliseconds. |
Use the show cmns EXEC command to display information pertaining to CMNS traffic activity. In particular, you can use this command to display X.25 Level 3 parameters for LAN interfaces (such as Ethernet or Token Ring).
| interface-name | (Optional) Interface to describe |
Use the show interfaces serial EXEC command to display information about a serial interface.
| number | Interface port number. |
Use the show llc2 privileged EXEC command to display active LLC2 connections.
Use the show x25 map EXEC command to display information about configured address maps.
Use the show x25 remote-red EXEC command to display the one-to-one mapping of the host IP addresses and the remote BFE device's IP addresses.
Use the show x25 route EXEC command to display the X.25 routing table.
Use the show x25 vc EXEC command to display the parameters and statistics of the active X.25 virtual circuit. To examine a particular virtual circuit, add an LCN argument to the show x25 vc command.
| lcn | (Optional) Logical channel number (LCN) |
Use the x25 accept-reverse interface configuration command to instruct the router to accept all reverse charge calls. The no x25 accept-reverse command disables this facility.
Use the x25 address interface configuration command to set the X.121 address of a particular network interface.
| x.121-address | Variable-length X.121 address. The address is assigned by the X.25 network service provider. |
x25 bfe-decision {no | yes | ask}
Use the x25 bfe-decision interface configuration command to direct how a router configured for x25 bfe-emergency decision will participate in emergency mode.
| no | Prevents the router from participating in emergency mode and from sending address translation information to the BFE device. This is the default. |
| yes | Allows the router to participate in emergency mode and to send address translation information to the BFE when the BFE enters emergency mode. The router obtains this information from the table created by the x25 remote-red command. |
| ask | Configures the router to prompt the console operator to enter the bfe EXEC command. |
x25 bfe-emergency {never | always | decision}
Use the x25 bfe-emergency interface configuration command to configure the circumstances under which the router participates in emergency mode.
| never | Prevents the router from sending address translation information to the BFE. If it does not receive address translation information, the BFE cannot open a new connection for which it does not know the address. This is the default. |
| always | Allows the router to pass address translations to the BFE when it enters emergency mode and an address translation table has been created. |
| decision | Directs the router to wait until it receives a diagnostic packet from the BFE device indicating that the emergency mode window is open. The window is only open when a condition exists that allows the BFE is to enter emergency mode. When the diagnostic packet is received, the router's participation in emergency mode depends on how it is configured using the x25 bfe-decision command. |
Use the x25 default interface configuration command to set a default protocol. Use the no x25 default command to remove the protocol specified.
| protocol | Specifies the protocol to assume; may be ip or pad. |
[no] x25 facility facility-keyword value
Use the x25 facility interface configuration command to force facilities on a per-call basis for calls originated by the router; switched calls are not affected. Use the no x25 facility command to disable a facility.
| facility-keyword | User facility. |
| value | Facility value; see the X.25 user facilities table in the Router Products Command Reference publication for a list of supported facilities and their values. |
Use the x25 hic interface configuration command to set the highest incoming-only virtual circuit number.
| circuit-number | Virtual circuit number from 1 through 4095, or 0 if there is no incoming-only virtual circuit range. The default is 0. |
Use the x25 hoc interface configuration command to set the highest outgoing-only virtual circuit number.
| circuit-number | Virtual circuit number from 1 through 4095, or 0 if there is no outgoing-only virtual circuit range. The default is 0. |
x25 hold-queue packets
[no] x25 hold-queue [packets]
To set the maximum number of packets that can be held until a virtual circuit is able to transmit, use the x25 hold-queue interface configuration command. To remove this command from the configuration file and restore the default value, use the no x25 hold-queue command without an argument.
| packets | Number of packets. A hold queue value of 0 allows an unlimited number of packets in the hold queue. The default is 10 packets. |
x25 hold-vc-timer minutes
no x25 hold-vc-timer
Use the x25 hold-vc-timer interface configuration command to prevent overruns on some X.25 switches caused by Call Request packets. This command starts the hold-vc-timer to prevent additional calls to a destination for a given period of time. The no x25 hold-vc-timer command restores the default value for the timer.
| minutes | Number of minutes to prevent calls from going to a previously failed destination. Incoming calls will still be accepted. The default is 0 minutes. |
x25 host name x.121-address [cud call-user-data]
no x25 host name
Use the x25 host global configuration command to define a static host name-to-address mapping. Use the no x25 host command to remove the host name.
| name | Host name. |
| x.121-address | The X.121 address. |
| cud call-user-data | (Optional) Specifies the Call User Data (CUD) field in the X.25 Call Request packet. |
Use the x25 htc interface configuration command to set the highest two-way virtual circuit number.
| circuit-number | Virtual circuit number from 1 through 4095, or 0 if there is no two-way virtual circuit range. The default is 1024 for X.25 network service interfaces; 4095 for CMNS network service interfaces. |
The router can clear a switched virtual circuit (SVC) after a period of inactivity. Use the x25 idle interface configuration command to set this period.
| minutes | Idle period in minutes. The default is 0 (causes the router to keep the SVC open indefinitely). |
Use the x25 ip-precedence interface configuration command to enable the ability to open a new virtual circuit based on the IP precedence value. The command no x25 ip-precedence causes the precedence value to be ignored when opening virtual circuits.
Use the x25 ips interface configuration command to set the interface default maximum input packet size to match that of the network.
| bytes | Byte count. It can be one of the following values: 16, 32, 64, 128, 256, 512, 1024, 2048, or 4096. The default is 128 bytes. |
Use the x25 lic interface configuration command to set the lowest incoming-only virtual circuit number.
| circuit-number | Virtual circuit number from 1 through 4095, or 0 if there is no incoming-only virtual circuit range. The default is 0. |
Use the x25 linkrestart interface configuration command to force a packet-level restart when the link level resets. This command restarts X.25 Level 3 when errors occur in Level 2 (LAPB). The no form of this command disables this function.
Use the x25 loc interface configuration command to set the lowest outgoing-only virtual circuit number.
| circuit-number | Virtual circuit number from 1 through 4095, or 0 if there is no outgoing-only virtual circuit range. The default is 0. |
Use the x25 ltc interface configuration command to set the lowest two-way virtual circuit number.
| circuit-number | Virtual circuit number from 1 through 4095, or 0 if there is no two-way virtual circuit range. The default is 1. |
[no] x25 map protocol-keyword protocol-address x.121-address
[option]
Use the x25 map interface configuration command to set up the LAN protocol-to-X.121 address mapping for the host. Because no defined protocol can dynamically determine such mappings, you must enter a mapping for each host with which the router will exchange traffic. Use the no form of this command with the appropriate network protocol and X.121 address arguments to retract a network protocol-to-X.121 mapping.
| protocol-keyword | Protocol type. Supported protocol keywords are listed in the X.25 user facilities table in the Router Products Command Reference publication. |
| protocol-address | Protocol address. |
| x.121-address | X.121 address. Both addresses specify the network protocol-to-X.121 mapping. |
| option | (Optional) Provides additional functionality or the X.25 facilities to be specified for originated calls. Can be any of the options listed in the protocols supported by X.25 PVCs table in the Router Products Command Reference publication. |
x25 map bridge x.121-address broadcast [option]
Use the x25 map bridge interface configuration command to configure bridging over X.25. The command specifies Internet-to-X.121 address mapping.
| x.121-address | The X.121 address. |
| broadcast | Required keyword for bridging over X.25. |
| option | (Optional) Services that can be added to this map; see X.25 map options table in the Router Products Command Reference publication for a list of supported services. |
[no] x25 map cmns nsap mac-address
[no] x25 map cmns nsap [x.121-address]
Use the x25 map cmns interface configuration command to map NSAP addresses to either MAC-layer addresses or X.121 addresses after enabling CMNS on a nonserial interface. To retract a mapping, use the no form of this command with the appropriate address arguments.
| nsap | NSAP address. The NSAP can be either the actual DTE NSAP address or the prefix of the NSAP address. The NSAP prefix is sufficient for a best match to route a call. |
| mac-address | MAC-level address. |
| x.121-address | (Optional) X.121 address. |
x25 map compressedtcp ip-address x.121-address [option]
no x25 map compressedtcp ip-address x.121-address
Use the x25 map compressedtcp interface configuration command to map compressed TCP traffic to X.121 addresses. The no form of this command deletes a TCP header compression map for the link.
| ip-address | IP address. |
| x.121-address | X.121 address. |
| options | (Optional) Services that can be added to this map; see X.25 map options table in the Router Products Command Reference publication for a list of supported services. |
Use the x25 modulo interface configuration command to set the window modulus.
| modulus | Either 8 or 128. The value of the modulo parameter must agree with that of the device on the other end of the X.25 link. The default is 8. |
Use the x25 nvc interface configuration command to specify the maximum number of switched virtual circuits (SVCs) that a protocol can have open simultaneously to one host. To increase throughput across networks, you can establish up to eight switched virtual circuits to a host/protocol.
| count | Circuit count from 1 to 8. A maximum of eight VCs can be configured for each protocol/host pair. Protocols that do not tolerate out-of-order delivery, such as encapsulated TCP header compression, will only use one virtual circuit despite this value. The default is 1. |
Use the x25 ops interface configuration command to set the interface default maximum output packet size to match that of the network.
| bytes | Byte count that is one of the following: 16, 32, 64, 128, 256, 512, 1024, 2048, or 4096. The default is 128 bytes. |
x25 pvc circuit protocol-keyword protocol-address [option]
no x25 pvc circuit protocol-keyword protocol-address
Use the encapsulating version of the x25 pvc interface configuration command to establish an encapsulation permanent virtual circuit (PVC). To delete the PVC, use the no form of this command with the appropriate channel number, protocol keyword, and protocol address.
| circuit | Virtual-circuit channel number which must be less than the virtual circuits assigned to the switched virtual circuits (SVCs). |
| protocol-keyword | Protocol type. For a list of supported protocols, see the protocols supported by X.25 PVCs table in the Router Products Command Reference publication. |
| protocol-address | Address of the host at the other end of the PVC. |
| option | (Optional) PVC's flow control parameters if they differ from the interface defaults. The option arguments add certain features to the mapping specified and can be either of the options listed in PVC options table in the Router Products Command Reference publication. |
x25 pvc pvc-number1 interface interface-name pvc pvc-number2
[option]
Use the switched version of the x25 pvc interface configuration command to configure a switched permanent virtual circuit (PVC) for a given interface.
| pvc-number1 | PVC number that will be used on the local interface (as defined by the primary interface command). |
| interface | Required keyword to specify an interface. |
| interface-name | Remote interface type and unit number (serial 0, for example). |
| pvc | Required keyword to specify a switched PVC. |
| pvc-number2 | Number that will be used on the remote interface. |
| option | (Optional) Adds certain features to the mapping specified; can be either option listed in the switched PVC options table in the Router Products Command Reference publication. |
x25 pvc pvc-number1 tunnel ip-address interface serial string pvc
pvc-number2 [options]
Use the tunnel version of the x25 pvc interface configuration command to connect two permanent virtual circuits (PVCs) across a TCP/IP LAN.
| pvc-number1 | PVC number of the connecting device. |
| tunnel | Indicates two PVCs will be connected across a TCP/IP LAN. |
| ip-address | IP address of the router to which you are connecting. |
| interface serial | Indicates the interface is serial. |
| string | Serial interface specification that accepts either a number or a string in Cisco 7000 series format (number/number) to denote the serial interface. |
| pvc | Indicates a PVC. |
| pvc-number2 | Remote PVC number on the target interface. |
| options | (Optional) Adds certain features for the connection; can be either option listed in the X.25 PVC tunnel options table in the Router Products Command Reference publication. |
x25 remote-red host-ip-address remote-black blacker-ip-address
Use the x25 remote-red interface configuration command to set up the table that lists the Blacker Front End (BFE) nodes (host or gateways) to which the router will send packets.
| host-ip-address | IP address of the host or a router that the packets are being sent to. |
| remote-black | Delimits the addresses for the table being built. |
| blacker-ip-address | IP address of the remote BFE device in front of the host to which the packet is being sent. |
[no] x25 route [# position] x.121-address [cud pattern] interface
interface number
x25 route [# position] x.121-address [cud pattern] ip ip-address
[ip- address2 ... ip-address6]
no x25 route [# position] x.121-address [cud pattern] ip ip-address
[no] x25 route [# position] x.121-address [cud pattern] alias
interface number
[no] x25 route [# position] x.121-address [substitute-source
rewrite-pattern] [substitute-dest rewrite-pattern] [cud pattern]
interface interface number
Use the x25 route global configuration command to create an entry in the X.25 routing table. Enter the no x25 route command with the appropriate arguments and keywords to remove an entry from the table.
| # position | (Optional) A pound sign (#) followed by a number to designate a positional parameter at which to insert the new entry. If no position parameter is given, the entry is appended to the end of the routing table. |
| x.121-address | Called X.121 address pattern. This argument can be either an actual X.121 destination address or a regular expression such as 1111*, representing a group of X.121 addresses. |
| cud pattern | (Optional) Call User Data pattern, which is specified as a printable ASCII string. The Call User Data field may be present in a call packet and is commonly 4 bytes long. |
| interface interface number | Specifies the destination interface (type followed by the unit or port number); for example, interface Ethernet 0. |
| ip ip-address | Specifies an IP address of the network interface or DTE for connections routed through a LAN. Optionally, up to five alternate IP addresses can be listed and each in turn will be tried in the event that the first destination fails, thus allowing alternate routes and decreasing the likelihood of failure. |
| alias interface number | Configures an interface alias. Specify the interface type followed by the unit or port number of the interface. Encapsulation calls are normally accepted when the destination address is that of the interface (or the zero-length X.121 address). Aliases allow the specified interface to accept calls with other destination addresses. |
| substitute-source rewrite-pattern | Optional) See the pattern rewrite elements and character matching tables in the Router Products Command Reference publication for summaries of pattern and character matching, respectively. |
| substitute-dest rewrite-pattern | (Optional) Specifies the called X.121 address to replace in locally routed X.25 calls. (For backwards compatibility, the substitute keyword will be accepted as substitute-dest and written to nonvolatile memory in the new format.) The backslash (\) character is treated specially in the argument rewrite-pattern; it indicates that the digit immediately following it selects a portion of the original called address to be inserted in the new called address. The characters \0 are replaced with the entire original address. The characters \1 through \9 are replaced with the strings that matched the first through ninth parenthesized parts of X.121-pattern. See the pattern matching table in the Router Products Command Reference for a summary of pattern rewrite elements. |
x25 routing [use-tcp-if-defs]
no x25 routing
Use the x25 routing global configuration command to enable X.25 switching or tunneling. The no form of this command disables the forwarding of X.25 calls.
| use-tcp-if-defs | (Optional) May be used to modify the acceptance of calls received over TCP. |
x25 rpoa name number
no x25 rpoa name
Use the x25 rpoa global configuration command to specify a sequence of packet network carriers. The no form of this command removes the specified name.
| name | Recognized Private Operating Agency (RPOA), which must be unique with respect to all other RPOA names. It is used in the x25 facility and x25 map interface configuration commands. |
| number | Sequence of 1 or more numbers used to describe an RPOA; up to 10 numbers are accepted. |
[no] x25 suppress-called-address
Use the x25 suppress-called-address interface configuration command to omit the destination address in outgoing calls. Use the no form of this command to reset this command to the default state.
[no] x25 suppress-calling-address
Use the x25 suppress-calling-address interface configuration command to omit the source address in outgoing calls. Use the no form of this command to reset this command to the default state.
Use the x25 t10 interface configuration command to set the value of the Restart Indication retransmission timer (T10) on DCE devices.
| seconds | Time in seconds. The default is 60 seconds. |
Use the x25 t11 interface configuration command to set the value of the Incoming Call timer (T11) on DCE devices.
| seconds | Time in seconds. The default is 180 seconds. |
Use the x25 t12 interface configuration command to set the value of the Reset Indication retransmission timer (T12) on DCE devices.
| seconds | Time in seconds. The default is 60 seconds. |
Use the x25 t13 interface configuration command to set the value of the Clear Indication retransmission timer (T13) on DCE devices.
| seconds | Time in seconds. The default is 60 seconds. |
Use the x25 t20 interface configuration command to set the value of the Restart Request retransmission timer (T20) on DTE devices.
| seconds | Time in seconds. The default is 180 seconds. |
Use the x25 t21 interface configuration command to set the value of the Call Request timer (T21) on DTE devices.
| seconds | Time in seconds. The default is 200 seconds. |
Use the x25 t22 interface configuration command to set the value of the Reset Request retransmission timer (T22) on DTE devices.
| seconds | Time in seconds. The default is 180 seconds. |
Use the x25 t23 interface configuration command to set the value of the Clear Request retransmission timer (T23) on DTE devices.
| seconds | Time in second. The default is 180 seconds. |
Use the x25 th interface configuration command to set the data packet acknowledgment threshold. When set, this parameter will instruct the router to send acknowledgment packets when it is not busy sending other packets, even if the number of input packets has not reached the input window size count. This command improves line responsiveness at the expense of bandwidth.
| delay-count | Value between zero and the input window size. A value of 1 sends one Receiver Ready acknowledgment per packet at all times. The default is 0 (which disables the acknowledgment threshold). |
Use the x25 use-source-address interface configuration command to over-ride the X.121 addresses of outgoing calls forwarded over a specific interface. Use the no form of this command to prevent updating the source addresses of outgoing calls.
Use the x25 win interface configuration command to change the default incoming window size to match that of the network.
| packets | Packet count that can range from 1 to one less than the window modulus. The default is 2 packets. |
Use the x25 wout interface configuration command to change the default outgoing window size to match that of the network.
| packets | Packet count that can range from 1 to the window modulus. The default is 2 packets. |
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