NI-2 Card	Cisco 6015	Cisco 6100 / Cisco 6130	Cisco 6160	Cisco 6260
DS3+T1/E1 IMA¹ DS3 trunk T1/E1 trunk and subtending T1/E1 IMA trunk and subtending	Yes	No	Yes²	Yes³
DS3/2DS3 DS3 trunk Two DS3 subtending ports	No	Yes	Yes	Yes⁴
OC-3c/OC-3c single-mode fiber (SMF) OC-3c trunk One OC-3c subtending port	Yes	Yes	Yes	Yes^⁵
OC-3c/OC-3c multimode fiber (MMF) OC-3c trunk One OC-3c subtending port	Yes	Yes	Yes	Yes⁴
OC-3c/2DS3 single-mode fiber (SMF) OC-3c trunk Two DS3 subtending ports	No	No	Yes	No
OC-3c/2DS3 multimode fiber (MMF) OC-3c trunk Two DS3subending ports	No	No	Yes	No

¹Inverse multiplexing over ATM.
²Use only with the DS3/2DS3+8xT1 system I/O card.
³When the E1 I/O module is installed, the system assumes E1 IMA functionality.
⁴When the E3 1/O module is installed, the system assumes E3 funtionality.
⁵When the OC-3c I/O module is installed, the system assumes OC-3c functionality.

NI-2 Subtending Support

NI-2 cards offer the same level of service and traffic fairness in subtending Cisco 6015, Cisco 6100, Cisco 6130, Cisco 6160, and Cisco 6260 DSLAMs. The level of service remains the same for both NI-1 and NI-2 based subtended nodes. (That is, you can mix NI-1 and NI-2 cards in the same subtending network for the Cisco 6100 and Cisco 6130 DSLAM.)

The following guidelines apply to subtending on an NI-2 supported DSLAM:

For Cisco 6100 and Cisco 6130 DSLAMs, the NI-2 card has the same virtual path (VP) and virtual circuit (VC) constraints as the NI-1.
The NI-2 card allows subtending for up to 1664 ports per system.

The Cisco 6015 has 1 subtend host chassis and up to 7 subtended node chassis for T1 without using DS3 or E1, 8 for T1 with a DS3 trunk, 12 in daisy-chain subtending.
The other chassis have 1 subtend host chassis and up to 12 subtended node chassis.

The NI-2 card supports tree and daisy-chain subtending.

Configuring 155 Mbps OC-3 SM and MM Interfaces

The NI-2 card supports system controller-type connectors.

Each port can be configured to support these clocking options:

Self-timing based on an internal clock.
Loop timing from the received data stream—Ideal for public network connections.
Timing synchronized to a selected master clock port—Required for distribution of a single clock across a network.
Traffic pacing allows you to set the aggregate output traffic rate on any port to a rate below the line rate. This feature is useful when you are communicating with a slow receiver or when you are connected to public networks with peak-rate tariffs.

The plug-and-play mechanisms of the DSLAM allow the interface to launch automatically. You can save all configuration information between hot swaps and reboots, while interface types are automatically discovered by the DSLAM, eliminating the need for mandatory manual configuration.

Default 155 Mbps ATM Interface Configuration Without Autoconfiguration

If Integrated Local Management Interface (ILMI) has been disabled or if the connecting end node does not support ILMI, these defaults are assigned to all 155 Mbps (OC-3c) interfaces:

ATM interface type = User Network Interface (UNI)
UNI Version = 4.0
Maximum virtual path identifier (VPI) bits = 8
Maximum virtual channel identifier (VCI) bits = 14
ATM interface side = network
ATM UNI type = private
Framing = sts-3c
Clock source = network derived
Synchronous Transfer Signal (STS) stream scrambling = enabled
Cell payload scrambling = enabled

The default subtend ID for each NI-2 DSLAM is 0 (zero).

Manual 155 Mbps Interface Configuration

To manually change any of the default configuration values, perform these tasks:

	Command	Task
Step 1	`DSLAM# configure terminal`	Go to global configuration mode.
Step 2	`DSLAM(config)# subtend-id 0-12`	Assign to this node a subtend ID that is unique in the subtend tree. The node attached to the trunk must have subtend ID 0.
Step 3	`DSLAM(config)# interface atm slot/port`	Specify an ATM interface and enter interface configurationmode.
Step 4	`DSLAM(config-if)# atm uni [side {network \| user} type {private \| public} version {3.0 \| 3.1 \| 4.0}]`	Modify the ATM interface side, type, or version.
Step 5	`DSLAM(config-if)# atm maxvpi-bits 0-8`	Modify the maximum VPI bits configuration.
Step 6	`DSLAM(config-if)# atm maxvci-bits 0-14`	Modify the maximum VCI bits configuration.
Step 7	`DSLAM(config-if)# sonet {stm-1 \| sts-3c}`	Modify the framing mode.
Step 8	`DSLAM(config-if)# clock source {loop-timed \| network-derived}`	Modify the clock source.
Step 9	`DSLAM(config-if)# scrambling {cell-payload \| sts-stream}`	Modify the scrambling mode.
Step 10	`DSLAM(config-if)# exit`	Return to global configuration mode.
Step 11	`DSLAM(config)# subtend-id 0-12`	Assign to this interface a subtend ID that is unique in the subtend tree. (This subtend ID identifies the subtended node attached to the interface, in the case where the attached node does not support the subtend ID feature.)

Note Note that Steps 2 and 11 are alternatives; do not perform both steps.

Examples

This example shows how to change the default ATM interface type to "private" using the atm uni type private command.

DSLAM# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.
DSLAM(config)# interface atm 0/1

DSLAM(config-if)# atm uni type private

This example shows how to change the clock source using the clock source network-derived command.

DSLAM# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.
DSLAM(config)# interface atm 0/1

DSLAM(config-if)# clock source network-derived

Note See the "Interface Configuration Troubleshooting" section, to confirm your interface configuration.

Configuring DS3 and E3 Interfaces

Use the 45 Mbps DS3 to accomplish the following tasks:

Set up wide-area connections.
Link multiple campuses.
Connect to public networks.

You can configure the NI-2 ports as redundant links using the switch routing protocols. You can also configure each port to support these clocking options:

Self-timing based on an internal clock.
Loop timing from the received data stream—Ideal for public network connections.
Timing synchronized to a selected master clock port—Required to distribute a single clock across a network.

Traffic pacing allows you to set the aggregate output traffic rate on any port to a rate below the line rate. This feature is useful when you are communicating with a slow receiver or when you are connected to public networks with peak-rate tariffs.

Default DS3 ATM Interface Configuration Without Autoconfiguration

If ILMI has been disabled or if the connecting end node does not support ILMI, these defaults are assigned to all DS3 interfaces:

ATM interface type = UNI
UNI Version = 4.0
Maximum VPI bits = 8
Maximum VCI bits = 14
ATM interface side = network
ATM UNI type = private

These defaults are assigned to all DS3 interfaces:

Framing = cbit-adm
Cell payload scrambling = disabled
Clock source = network-derived
Electrical line build out (LBO) = short
Auto-far-end remote failure(ferf) on loss of signal (LOS) = on
Auto-ferf on out of frame (OOF) = on
Auto-ferf on red = on
Auto-ferf on loss of cell delineation (LCD ) = on
Auto-ferf on alarm indication signaling (AIS) = on

These defaults are assigned to all E3 interfaces:

Framing = G.832 adm
Cell payload scrambling = on
Clock source = network derived
Auto-ferf on LOS = on
Auto-ferf on OOF = on
Auto-ferf on LCD = on (applicable to non-PLCP mode only)
Auto-ferf on AIS = on

The default subtend ID for each NI-2 DSLAM is 0 (zero).

Manual DS3 and E3 Interface Configuration

To manually change any of the DS3 or E3 default configuration values, perform these tasks:

	Command	Task
Step 1	`DSLAM# configure terminal`	Go to global configuration mode.
Step 2	`DSLAM(config)# subtend-id 0-12`	Assign to this node a subtend ID that is unique in the subtend tree. The node attached to the trunk must have subtend ID 0.
Step 3	`DSLAM(config)# network-clock-select {1-4_priority \| bits \| system} atm slot/port`	Configure the network-derived clock.
Step 4	`DSLAM(config)# interface atm slot/port`	Specify an ATM interface and enter interface configurationmode.
Step 5	`DSLAM(config-if)# atm uni [side {network \| user} type {private \| public} version {3.0 \| 3.1 \| 4.0}]`	Modify the ATM interface side, type, or version.
Step 6	`DSLAM(config-if)# atm maxvpi-bits 0-8`	Modify the maximum VPI bits configuration.
Step 7	`DSLAM(config-if)# atm maxvci-bits 0-14`	Modify the maximum VCI bits configuration.
Step 8	`DSLAM(config-if)# framing {cbitadm \| cbitplcp \| m23adm \| m23plcp}`	Modify the framing mode (DS3 shown).
Step 9	`DSLAM(config-if)# scrambling {cell-payload}`	Modify the scrambling mode.
Step 10	`DSLAM(config-if)# clock source { loop-timed \| network-derived}`	Modify the clock source.
Step 11	`DSLAM(config-if)# lbo {long \| short}`	Modify the line build-out.
Step 12	`DSLAM(config-if)# auto-ferf {ais \| lcd \| los \| oof \| red}`	Modify the auto-ferf configuration.
Step 13	`DSLAM(config-if)# exit`	Return to global configuration mode.
Step 14	`DSLAM(config)# subtend-id 0-12`	Assign to this interface a subtend ID that is unique in the subtend tree. (This subtend ID identifies the subtended node attached to the interface, in the case where the attached node does not support the subtend ID feature.)

Note Note that Steps 2 and 14 are alternatives; do not perform both steps.

Examples

This example shows how to change the default ATM interface type to "private" using the atm uni type private command.

DSLAM# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.
DSLAM(config)# interface atm 0/1

DSLAM(config-if)# atm uni type private

This example shows how to change the clock source using the clock source network-derived command.

DSLAM# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.
DSLAM(config)# interface atm 0/1

DSLAM(config-if)# clock source network-derived

Note See the "Interface Configuration Troubleshooting" section, to confirm your interface configuration.

Configuring T1/E1 Multiplexing over ATM

Cisco IOS Inverse Multiplexing over ATM (IMA) is available for Cisco 6015 and Cisco 6160 DSLAMs with installed DS3+T1/E1 IMA NI-2 cards.

The T1/E1 inverse multiplexing over ATM uses IMA technology to aggregate multiple low-speed links (T1/E1) into one or more IMA groups at speeds between 1.5 Mbps and 12 Mbps for T1 and between 2 Mbps and 16 Mbps for E1. IMA breaks up the ATM cell stream and distributes the cells over the multiple physical links of an IMA group and then recombines the cells into a single stream at the other end of the connection. The multiple links of an IMA group increase the logical link bandwidth to approximately the sum of the individual link rates.

The T1/E1 IMA features for the Cisco 6015 and the Cisco 6160 DSLAMs offer the following benefits:

High-bandwidth performance at a cost lower than that offered by DS3 transmission facilities
Migration path to high bandwidth without the need to change transport facilities
Link recovery that passes cells from a failed IMA group link to the other IMA group links

How IMA Works

IMA links transmit IMA control protocol (ICP) cells, which enable the reconstruction of the original ATM cell stream. ICP cells define and separate IMA frames passing through each physical link in an IMA group. ICP cells also control the operation of IMA by accounting for cell delay variation (CDV), which is introduced by ICP cells, and the link differential delays on physical links to ensure the proper reassembly of IMA frames. If an IMA frame length of 128 cells is used, 1 out of every 128 cells on a physical link is an ICP cell. In this scenario, a frame containing fewer than 128 cells is injected with filler cells. The receiving end of an IMA group extracts the ICP and filler cells as the IMA stream is reconstructed into an ATM cell stream and passed to the ATM layer. IMA operation is transparent to ATM layer protocols. Therefore, the ATM layer operates as if a single physical interface were being used.

Figure 8-1 illustrates IMA with three bundled links.

Figure 8-1: IMA Inverse Multiplexing and Demultiplexing

Depending upon the installed I/O module (1DS3+8T1 I/O or 8xE1 I/O), IMA can be configured by a grouping of the following physical links (see the "Supported Platforms" section):

T1
E1 (Only the Cisco 6015 DSLAM supports the 8xE1 I/O module.)

Note See the "Supported Platforms" section on page 8-9 for detailed information on platform-specific support of the network I/O modules.

The DS3+T1/E1 IMA NI-2 supports three modes of operation:

DS3 trunk with 8xT1 IMA subtend
8xT1 IMA trunk/subtend
8xE1 IMA trunk/subtend (Cisco 6015 DSLAM only)

Note The type of network I/O module (1DS3+8T1 I/O or 8xE1 I/O) detected at system startup determines the mode of operation.

The eight links on the DS3+T1/E1 IMA NI-2 can be independent ATM links or can be configured into one or more IMA groups. There are four static IMA groups. Each IMA group can contain from zero to eight T1/E1 links. Any combination of independent T1/E1 links and IMA groups is allowed, up to eight T1/E1 links total.

Some examples of allowed combinations are:

Two links and one IMA group with six links
Four IMA groups with two links in each
Four links and two IMA groups with two links in each

Supported Platforms

Table 8-2 show the supported platforms for the IMA feature.

Table 8-2: Supported Platforms for T1/E1 Multiplexing over ATM

NI-2	Chassis	I/O Module	Minimum IOS Release
DS3+T1/E1 IMA	6015	1DS3+8xT1	12.1(4)DA
DS3+T1/E1 IMA	6015	8xE1	12.1(4)DA
DS3+T1/E1 IMA	6160	1DS3+8xT1	12.1(5)DA
DS3+T1/E1 IMA	6260	8xE1	Future

Prerequisites

Before you can configure a Cisco 6015 or Cisco 6160 DSLAM to provide T1/E1 IMA service, you must perform the following tasks:

Install a DS3 + 8xT1/E1 IMA NI-2 card in your DSLAM.
Install an 1DS3+8xT1 network I/O module or an 8xE1 network I/O module.

Configuration Tasks

Perform the following tasks to configure ATM interfaces for IMA:

Configuring a Trunk Interface (Required)
Configuring T1/E1 Interfaces (Required)
Configuring IMA Interfaces (Required)

Each link can be used as an independent T1/E1 ATM link with all the properties and functionality of ATM interfaces. When the link becomes part of an IMA group, its independent ATM functionality ceases; however, the IMA group can be configured like a single ATM port.

Configuring a Trunk Interface

The DS3+T1/E1 IMA NI-2 card supports the trunk selection feature. This feature allows you to configure any WAN interface (the DS3, any T1 link, any E1 link, or any IMA group) as the trunk. When you configure a T1 link or an IMA group as the trunk, the DS3 port is disabled. When you select the DS3 port as the trunk, the T1 links and IMA groups are all treated as subtended ports.

	Command	Purpose
Step 1	`DSLAM> enable Password:<password> DSLAM#`	Enter enable mode. Enter the password. The enable mode prompt is `DSLAM#`.
Step 2	`DSLAM# configure terminal DSLAM(config)#`	Enter global configuration mode, which has the prompt `DSLAM(config)#`.
Step 3	`DSLAM(config)# interface atm 0/1`	Enter interface configuration mode, which has the prompt `DSLAM(config-if)#`.
Step 4	`DSLAM(config-if)# shutdown`	Disable the individual link by enabling the shutdown command.
Step 5	`DSLAM(config-if)# exit`	Return to global config mode.
Step 6	`DSLAM(config)# atm ni2-switch trunk atm 0/1`	Select the interface to use as the trunk.
Step 7	`DSLAM(config)# interface atm 0/1`	Enter interface configuration mode, which has the prompt `DSLAM(config-if)#`.
Step 8	`DSLAM(config-if)# no shutdown`	Enable the individual link by canceling the shutdown state.
Step 9	`DSLAM(config-if)# end`	Return to enable mode when you finish configuring interfaces.

Verifying the Trunk Interface

Use the show running-config command to verify that the DSLAM running configuration contains the following statement:

atm ni2-switch trunk ATM 0/1

If the trunk interface is not the interface you meant to select, using the atm ni2-switch trunk command, repeat the procedure in the "Configuring a Trunk Interface" section.

Configuring T1/E1 Interfaces

To configure a T1 or E1 interface, use the following procedure:

	Command	Purpose
Step 1	`DSLAM> enable Password: <password> DSLAM#`	Enter enable mode. Enter the password. The enable mode prompt is `DSLAM#`.
Step 2	`DSLAM# configure terminal DSLAM(config)#`	Enter global configuration mode, which has a prompt of `DSLAM config)#`.
Step 3	`DSLAM(config)# interface atm 0/2 DSLAM(config-if)#`	Enter interface configuration mode, which has a prompt of `DSLAM(config-if)#`.
Step 4	`DSLAM(config-if)# no shutdown`	Enable the individual link by canceling the shutdown state. Repeat Steps 3 and 4 if your DSLAM has more than one interface that you need to configure.
Step 5	`DSLAM(config-if)# linecode ami` or `DSLAM(config-if)# linecode hdb3`	Select the line coding for the T1 link. Note If you select ami linecoding, enable scrambling on the link. Select the line coding for the E1 link.
Step 6	`DSLAM(config-if)# framing esf` or `DSLAM(config-if)# framing pcm30`	Select the frame type for the T1 data link. Select the frame type for the E1 data link.
Step 7	`DSLAM(config-if)# lbo short 133`	Specify the line length (short or long), followed by the length. You can view the acceptable lengths by including the ? option after the lbo long or lboshortcommands.
Step 8	`DSLAM(config-if)# clock source loop-timed`	Select the transmit clock source for a link.
Step 9	`DSLAM(config-if)# end`	When you finish configuring interfaces, return to enable mode.

Verifying T1/E1 Interfaces

After configuring your T1/E1 interfaces, use the following commands to verify their operational status:

	Command	Purpose
Step 1	`DSLAM# show interface atm0/2`	Displays the interface configuration, status, and statistics of the ATM interface.
Step 2	`DSLAM# show controllers atm0/2`	Displays diagnostic information for the specified interface.

If an interface is down and you configured it as up, or if the displays indicate that the hardware is not functioning properly, make sure that the T1/E1 interface is properly connected and configured.

Configuring IMA Interfaces

To configure an IMA interface, you must use configuration mode (manual configuration). In this mode, you enter Cisco IOS commands at the DSLAM prompt.

	Command	Purpose
Step 1	`DSLAM> enable`	Enter enable mode.
Step 2	`DSLAM# configure terminal`	Enter global configuration mode, which has a prompt of `DSLAM(config)#`.
Step 3	`DSLAM(config)# interface atm 0/2`	Enter interface configuration mode, which has a prompt of `DSLAM(config-if)#`.
Step 4	`DSLAM(config-if)# ima-group 2`	Assign the ATM interface to an IMA group (numbered from 0 to 3). After the interface is assigned to an IMA group, individual ATM functionality is no longer available on the link.
Step 5	`DSLAM(config-if)# no shutdown`	Enable the individual link by canceling the shutdownstate. Repeat Step 3 through Step 5 if your DSLAM has more than one interface that you need to configure.
Step 6	`DSLAM(config-if)# exit`	Return to global configuration interface mode.
Step 7	`DSLAM(config)# interface atm0/ima2`	Begin configuring the IMA interface.
Step 8	`DSLAM(config-if)# ima clock-mode independent`	Select the transmit clock mode for the selected IMAgroup.
Step 9	`DSLAM(config-if)# ima differential-delay-maximum 68`	Enter the maximum differential delay in milliseconds for the selected IMA group.
Step 10	`DSLAM(config-if)# ima active-links-minimum 2`	Enter the minimum number of links that need to be operational for the selected IMA group.
Step 11	`DSLAM(config-if)# no shutdown`	Enable the IMA group by canceling the shutdownstate.
Step 12	`DSLAM(config-if)# end`	When you finish configuring interfaces, return to enable mode.

Verifying the IMA Configuration

After configuring your IMA interfaces, use the following commands to verify their operational status.

	Command	Purpose
Step 1	`DSLAM# show interface atm0/ima2`	Displays interface configuration, status, and statistics for the IMA interface.
Step 2	`DSLAM# show controllers atm0/ima2`	Displays diagnostic information for the specified IMA group.
Step 3	`DSLAM# show ima interface atm0/ima2`	Displays configuration information and operational status for the specified IMA group.
Step 4	`DSLAM# show ima interface atm 0/2`	Displays information for a single link in an IMAgroup.

If an interface is down and you configured it as up, or if the displays indicate that the hardware is not functioning properly, make sure that the new interface is properly connected and configured.

Troubleshooting Tips

Use the following general guidelines to troubleshoot IMA groups and the individual links of an IMA group.

Make Sure T1/E1 Links Are Error Free

	Command	Purpose
Step 1	`DSLAM# show interface atm 0/2`	Use the show interface atm command to verify the status of a T1 or E1 link. Verify that the administrative status and protocol status are both up. Also, check for CRC errors and loopback status.
Step 2	`DSLAM# show running-config interface atm 0/2`	Verify that the interface is not shut down. Also, compare the interface configuration with the far end interface to ensure that there are no configuration mismatches.
Step 3	`DSLAM# show controllers`	Use the show controllers command to verify the port status and view any active alarms states.

Troubleshoot the IMA Groups and Links

	Command	Purpose
Step 1	`DSLAM# show ima interface atm0/ima0`	Verify that the IMA group status is up. Also, use the command output to verify the IMA configuration at the near and far end.
Step 2	`DSLAM# show ima interface atm0/2`	Verify that the member links of the IMA group are up.
Step 3	`DSLAM# show ima counters`	The show ima counters command reports IMA statistics in 15-minute intervals with 24 hour totals.

See http://www.cisco.com/univercd/cc/td/doc/product/dsl_prod/6015/user/hig/index.htm for troubleshooting information.

Monitoring and Maintaining IMA

This section describes commands that you can use to monitor and maintain IMA configurations. Table 8-3 lists the commands.

Table 8-3: Commands for Monitoring and Maintaining IMA

Command	Purpose
`DSLAM# show ima interface`	Displays information about all IMA groups and the links in those groups.
`DSLAM# show ima interface atm0/imaima-group-number`	Displays information about a single IMA group and the links in that group.
`DSLAM# show controllers`	Displays information about current settings and performance at the physical level.
`DSLAM# show ima interface atm0/atm-interface-number`	Displays IMA information for an individual link in an IMA group.

Configuration Examples

This section contains sample configurations that show how to configure the following trunks:

IMA Trunk with IMA Subtended Chassis

The following sample configuration shows how to configure the following groups:

An IMA group containing four links as a trunk interface
Two IMA groups, each containing two links, connecting subtended Cisco 6015 or Cisco 6160 DLSAM

Figure 8-2 illustrates the network topology being configured in the following configuration sample.

Figure 8-2: IMA Trunk with IMA Subtended Chassis

Note Comments are written in boldface type and encapsulated with exclamation points.

...
atm ni2-switch trunk ATM0/IMA0 !Configures interface ATM0/IMA0 as the trunk!

 
!
!
!
interface ATM0/0
 no ip address
 no ip route-cache
 atm maxvp-number 0
 atm maxvc-number 4096
 atm maxvci-bits 12
!
interface Ethernet0/0
 ip address 192.168.1.1 255.255.255.0
 no ip route-cache
!
interface ATM0/1
 no ip address
 no ip route-cache
 shutdown
 no atm ilmi-keepalive
!
interface ATM0/2
 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
 ima-group 0 !Adds this interface to IMA group 0!

!
interface ATM0/3
 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
 ima-group 0 !Adds this interface to IMA group 0!

!
interface ATM0/4
 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
 ima-group 0 !Adds this interface to IMA group 0!

!
interface ATM0/5
 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
 ima-group 0 !Adds this interface to IMA group 0!

!
interface ATM0/6
 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
 ima-group 1 !Adds this interface to IMA group 1!

!
interface ATM0/7
 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
 ima-group 1 !Adds this interface to IMA group 1!

!
interface ATM0/8
 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
 ima-group 2 !Adds this interface to IMA group 2!

!
interface ATM0/9
 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
 ima-group 2 !Adds this interface to IMA group 2!

!
interface ATM0/IMA0 !IMA group 0 configuration!

 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 ima active-links-minimum 2
 ima clock-mode independent
 ima differential-delay-maximum 68
!
interface ATM0/IMA1 !IMA group 1 configuration!

 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 ima active-links-minimum 2
 ima clock-mode independent
 ima differential-delay-maximum 68
!
interface ATM0/IMA2 !IMA group 2 configuration!

 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 ima active-links-minimum 2
 ima clock-mode independent
 ima differential-delay-maximum 68
!
interface ATM0/IMA3
 no ip address
 no ip route-cache
 shutdown
 no atm ilmi-keepalive
...

DS3 Trunk with IMA and T1 Subtended Chassis

The following sample configuration involves a network topology containing a mixture of IMA, T1, and DS3 interfaces. It is relevant only to IMA on platforms with the 1DS3+8xT1 I/O module installed.

Figure 8-3 illustrates the network topology being configured in the following configuration sample.

Figure 8-3: DS3 Trunk with IMA and T1 Subtended Chassis

...
atm ni2-switch trunk ATM0/1 !DS3 is the default trunk!

!
!
!
interface ATM0/0
 no ip address
 no ip route-cache
 atm maxvp-number 0
 atm maxvc-number 4096
 atm maxvci-bits 12
!
interface Ethernet0/0
 ip address 192.168.1.1 255.255.255.0
 no ip route-cache
!
interface ATM0/1
 no ip address
 no ip route-cache
 no atm ilmi-keepalive
!
interface ATM0/2
 no ip address
 no ip route-cache
 no atm ilmi-keepalive
 ima-group 0 !Adds this interface to IMA group 0!

!
interface ATM0/3
 no ip address
 no ip route-cache
 no atm ilmi-keepalive
 ima-group 0 !Adds this interface to IMA group 0!

!
interface ATM0/4
 no ip address
 no ip route-cache
 no atm ilmi-keepalive
 ima-group 0 !Adds this interface to IMA group 0!

!
interface ATM0/5
 no ip address
 no ip route-cache
 no atm ilmi-keepalive
 ima-group 0 !Adds this interface to IMA group 0!

!
interface ATM0/6 !T1 configuration!

 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
!
interface ATM0/7 !T1 configuration!

 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
!
interface ATM0/8 !T1 configuration!

 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
!
interface ATM0/9 !T1 configuration!

 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 clock source loop-timed
 scrambling cell-payload
 linecode ami
 lbo short 133
!
interface ATM0/IMA0 !IMA group 0 configuration!

 no ip address
 no ip route-cache
 no ip mroute-cache
 no atm ilmi-keepalive
 ima active-links-minimum 4
 ima clock-mode independent
 ima differential-delay-maximum 68
!
interface ATM0/IMA1
 no ip address
 no ip route-cache
 shutdown
 no atm ilmi-keepalive
!
interface ATM0/IMA2
 no ip address
 no ip route-cache
 shutdown
 no atm ilmi-keepalive
!
interface ATM0/IMA3
 no ip address
 no ip route-cache
 shutdown
 no atm ilmi-keepalive
...

Interface Configuration Troubleshooting

You can use the following privileged EXEC mode commands to confirm that the hardware, software, and interfaces for the DSLAM are configured as intended.

Command	Purpose
`DSLAM# show version`	Confirm that software of the correct version and type is installed.
`DSLAM# show hardware`	Confirm the type of hardware installed in the system.
`DSLAM# show interface ethernet [slot/port]`	Confirm that the Ethernet interface is configured correctly.
`DSLAM# show atm addresses`	Confirm the ATM address is configured correctly.
`DSLAM# ping atm interface atm [slot/port] [vpi] ip-address xxx.xxx.xxx.xxx`	Test for connectivity between the DSLAM and a host.
`DSLAM# show {atm \| ces} interface`	Confirm that the ATM interfaces are configured correctly.
`DSLAM# show atm status`	Confirm the status of the ATM interfaces.
`DSLAM# show atm vc`	Confirm the status of ATM virtual interfaces.
`DSLAM# show running-config`	Confirm that the configuration being used is configured correctly.
`DSLAM# show startup-config`	Confirm that the configuration saved in NVRAM is configuredcorrectly.
`DSLAM# show controllers {atm \| ethernet}`	Confirm interface controller memory addressing.

You can also view an ATM layer fault state and loss of cell delineation using the CLI and MIB. The default alarm level for this fault state is Major.

You can use the following privileged EXEC mode commands to initiate line loopbacks.

Command	Purpose
`DSLAM# loopback diagnostic`	Diagnostic loopback. The outgoing cells are looped back toward the switch. This command is available on all ports.
`DSLAM# loopback line`	Line loopback. The incoming line is looped back toward the coax. This command is available only on trunk and subtending ports.
`DSLAM# loopback payload`	Payload loopback. The incoming payload is looped back toward the coax. This command is available only on DS3 trunk and subtendingports.

Table of Contents

Configuring the Trunk and Subtended Interfaces

NI-2 Card and DSLAM Compatibility

NI-2 Subtending Support

Configuring 155 Mbps OC-3 SM and MM Interfaces

Manual 155 Mbps Interface Configuration

Examples

Configuring DS3 and E3 Interfaces

Manual DS3 and E3 Interface Configuration

Examples

Configuring T1/E1 Multiplexing over ATM

Supported Platforms

Prerequisites

Configuration Tasks

Configuring a Trunk Interface

Configuring T1/E1 Interfaces

Configuring IMA Interfaces

Make Sure T1/E1 Links Are Error Free

Troubleshoot the IMA Groups and Links

Configuration Examples

IMA Trunk with IMA Subtended Chassis

DS3 Trunk with IMA and T1 Subtended Chassis

Interface Configuration Troubleshooting