Managing Ecmp Group Paths - Dell S4048T Configuration Manual

utilization calculation performs when the utilization of the link-bundle (not a link within a bundle) exceeds
60%.
Enable link bundle monitoring using the ecmp-group command.
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
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

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
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)#
Utilization[In Percent]
36
52
Equal Cost Multi-Path (ECMP) 370