Deployment Guide

Table Of Contents
NOTE: An ecmp-group index is generated automatically for each unique ecmp-group when you configure 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, to enable the link bundle monitoring feature, use the ecmp-group command. In the
following example, 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
DellEMC# 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 Utilization[In Percent]
Te 1/1/1 Up 36
Te 1/1/1 Up 52
Managing ECMP Group Paths
To avoid path degeneration, configure the maximum number of paths for an ECMP route that the L3 CAM can hold. 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:
For the new settings to take effect, save the new ECMP settings to the startup-config (write-mem) then reload
the system.
● 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
DellEMC(conf)#ip ecmp-group maximum-paths 3
User configuration has been changed. Save the configuration and reload to take effect
DellEMC(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
The range is from 1 to 64.
2. Add interfaces to the ECMP group bundle.
CONFIGURATION ECMP-GROUP mode
interface interface
3. Enable monitoring for the bundle.
CONFIGURATION ECMP-GROUP mode
link-bundle-monitor enable
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Equal Cost Multi-Path (ECMP)