Managing Ecmp Group Paths; Creating An Ecmp Group Bundle - Dell S4820T Configuration Manual

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.
Example of Viewing Link Bundle Monitoring
Dell# show link-bundle-distribution ecmp-group 1
Link-bundle trigger threshold - 60
ECMP bundle - 1 Utilization[In Percent] - 44 Alarm State - Active
Interface Line Protocol
Te 1/1 Up
Te 1/1 Up

Managing ECMP Group Paths

Configure the maximum number of paths for an ECMP route that the L3 CAM can hold to avoid path
degeneration. When you do not configure the maximum number of routes, the CAM can hold a
maximum ECMP per route.
To configure the maximum number of paths, use the following command.
NOTE: Save the new ECMP settings to the startup-config (write-mem) then reload the system for
the new settings to take effect.
• Configure the maximum number of paths per ECMP group.
CONFIGURATION mode.
ip ecmp-group maximum-paths {2-64}
• Enable ECMP group path management.
CONFIGURATION mode.
ip ecmp-group path-fallback
Example of the ip ecmp-group maximum-paths Command
Dell(conf)#ip ecmp-group maximum-paths 3
User configuration has been changed. Save the configuration and reload to take
effect
Dell(conf)#

Creating an ECMP Group Bundle

Within each ECMP group, you can specify an interface.
If you enable monitoring for the ECMP group, the utilization calculation is performed when the average
utilization of the link-bundle (as opposed to a single link within the bundle) exceeds 60%.
1. Create a user-defined ECMP group bundle.
CONFIGURATION mode
ecmp-group ecmp-group-id
Equal Cost Multi-Path (ECMP)
Utilization[In Percent]
36
52
339