Specifications

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Cisco MGX 8800/8900 Series Software Configuration Guide
Release 5.1, Part Number OL-6482-01, Rev. A0, January 25, 2005
Chapter 9 Switch Operating Procedures
Managing IMA
Note A restart will correct the problem in all three of the previously described situations if a different IMA
group ID is configured for the near and far ends. If the same IMA group ID is configured at both ends,
it is possible that the links in loopback will respond first and the IMA group will not communicate with
the far end.
Cisco MGX switches allow you to manually restart an IMA group to correct communications problems.
Beginning with Release 5, you can also enable and configure the IMA autorestart feature, which will
automatically restart an IMA group when necessary. The following sections describe how to use the
manual and automatic restart features.
Using Manual IMA Group Restart
To manually restart an IMA group, enter the restartimagrp <bay.group> command. Replace bay with
the number 1 to specify the top bay, or 2 to specify the lower bay. Replace group with the IMA group
you want to restart (To display the configured IMA groups, enter the dspimagrps command).
After you enter the restartimagrp command, the IMA group attempts to re-establish the IMA protocol
with far end of a failed connection.
In the following example, the user attempts to restart the IMA group number 6 in the lower bay.
Unknown.7.PXM.a > restartimagrp 2.6
Using Automatic IMA Group Restart
To enable and configure the IMA autorestart feature, use the following procedure.
Note The IMA autorestart feature is a Cisco enhancement to the IMA operation described in the IMA
specifications. The IMA specifications do not provide for the detection of lines in loopback mode and
for automatic restart.
Step 1 Establish a configuration session with the active IMA-supportive card using a user ID with GROUP1
privileges or higher.
Step 2 Enter the dspimaparms command as shown in the following example to determine whether the
autorestart feature is enabled on the switch.
M8830_CH.1.PXM.a > dspimaparms
IMA Parameters
================================
Max IMA Groups Supported : 16
Configured IMA Groups : 1
Min IMA ID Range : 0
Max IMA ID Range : 255
IMA Ver Fallback : Enable
IMA Auto-Restart : Disable
Step 3 If the autorestart feature is not enabled on the node, enable it with the cnfimaparms command as shown
in the following example:
M8830_CH.1.PXM.a > cnfimaparms -restart 1