Cisco MGX 8950 Specifications download pdf (Page 459)

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Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide

Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004

Chapter 9 Switch Operating Procedures

Managing IMA

Step 1 Establish a configuration session with the active PXM1E-16-T1E1 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

Step 4 To display the autorestart feature configuration for a specific IMA group, enter the dspimagrp command

as described in the “Displaying the Status of a Single IMA Group” section, which appears earlier in this

chapter. For more information on autorestart information in the dspimagrp command display, see

“Displaying the IMA Group Autorestart Configuration and State” section, which appears later in this

chapter.

Step 5 To configure the autorestart feature for a specific IMA group, enter the cnfimagrp command using the

following format:

M8830_CH.1.PXM.a > cnfimagrp -grp <group> [-mode <autoRestart>] [-rxid <rxImaIdExpected>]

Replace the group variable with the IMA group number as it appears in the dspimagrp and dspimgrps

command displays.

Include the -mode option when you need to change the autorestart mode for the group. Replace the

autoRestart variable with 1 to disable autorestart for this group, 2 to enable autorestart and relearn the

far end ID on restart, and 3 to enable autorestart and reuse the previously learned far end ID on restart.

The -rxid parameter is optional and specifies the far end IMA ID to expect on autorestart. If a far end ID

is or will be configured on the IMA group (using cnfimgrp -txid option on MGX switches), enter this

ID with the -rxid option on the near end to help the switch determine whether an IMA group link is in

loopback. Be sure to specify an IMA far end ID that is different from the near end ID. The range is -1 to

255. Enter the -rxid option with -1 to configure the IMA group to learn the far end user ID when the IMA

group starts.

Cisco recommends two configurations for the autorestart feature. The preferred configuration is to set

the -mode option to reuse (3) the far end ID and set the -rxid option to -1. This configuration causes the

IMA group to learn the far end ID the first time the IMA group starts and reuse that IMA group ID on

all future restarts.

The second configuration sets the -mode option to relearn (2) the far end ID and sets the -rxid option to

-1. This configuration causes the IMA group to learn the far end ID every time the IMA group starts. To

make the far end ID persistent after it is learned, you must enter the cnfimagrp command a second time

and change the -mode option to 3 (reuse).

The following example configures IMA group 2.1 to use the preferred configuration:

M8830_CH.1.PXM.a > cnfimagrp -grp 2.1 -mode 3 -rxid -1

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