Reference Guide

332 | Equal Cost Multi-Path (ECMP)
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Enable link bundle monitoring using the ecmp-group command.
Managing ECMP Group Paths
Managing ECMP Group Paths is supported only on platform:
Configure the maximum number of paths for an ECMP route that the L3 CAM can hold to avoid path
degeneration. When the maximum number of routes is not configured, the CAM can hold a maximum
ECMP per route.
Use the
ip ecmp-group path-fallback command to enable or disable the feature.
pt-s4801-temp1(conf)#ip ecmp-group maximum-paths 3
User configuration has been changed. Save the configuration and reload to take effect
pt-s4801-temp1(conf)#
Note: An ecmp-group index is generated automatically for each unique ecmp-group when the user
configures multipath routes to the same network. The system can generate a maximum of 512 unique
ecmp-groups. The ecmp-group indexes are generated in even numbers (0, 2, 4, 6... 1022) and are for
information only.
For link bundle monitoring with ECMP, the
ecmp-group command is used to enable the link bundle
monitoring feature. The ecmp-group with id 2, enabled for link bundle monitoring is user configured. This
is different from the ecmp-group index 2 that is created by configuring routes and is automatically
generated.
These two ecmp-groups are not related in any way.
Task Command Syntax Command Mode
Configure the maximum number of paths
per ECMP group
ip ecmp-group maximum-paths
{2-64}
CONFIGURATION
Enable ECMP group path management
ip ecmp-group path-fallback
CONFIGURATION
Note: You must save the new ECMP settings to the startup-config (write-mem) then reload the system for the
new settings to take effect.