Reference Guide
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 interface tengigabitethernet 0/0 interface port-channel 100
3. Enable the monitoring for the bundle.
CONFIGURATION ECMP-GROUP mode
link-bundle-monitor enable
Modifying the ECMP Group Threshold
You can customize the threshold percentage for monitoring ECMP group bundles.
To customize the ECMP group bundle threshold and to view the changes, use the following commands.
● Modify the threshold for monitoring ECMP group bundles.
CONFIGURATION mode
link-bundle-distribution trigger-threshold {percent}
The range is from 1 to 90%.
The default is 60%.
● Display details for an ECMP group bundle.
EXEC mode
show link-bundle-distribution ecmp-group ecmp-group-id
The range is from 1 to 64.
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 indices are
generated in even numbers (0, 2, 4, 6... 1022) and are for information only.
You can configure ecmp-group with id 2 for link bundle monitoring. This ecmp-group 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.
Dell(conf-ecmp-group-5)#show config
!
ecmp-group 5
interface tengigabitethernet 0/2
interface tengigabitethernet 0/3
link-bundle-monitor enable
Dell(conf-ecmp-group-5)#
ECMP Support in L3 Host and LPM Tables
The L3 host and Longest Prefix Match (LPM) tables provide ECMP next-hop forwarding for destination addresses. You can
program IPv6 /128 and IPv4 /32 route prefixes to be stored in the L3 host table and move IPv6 /128 and IPv4 /32 route
prefixes between the host table and the LPM route table.
By default, IPv4 route prefixes are installed only in the LPM table and IPv6/128 route prefixes are installed only in the L3 host
table. In previous releases, the IPv6 /128 entries in the host table were not supported by ECMP.
NOTE:
When moving destination prefixes from the LPM to the host table, there may be a hash collision because the host
table is a hash table. In this case, a workaround does not exist for programming route entries in the host table.
NOTE: Before moving IPv6/128 route prefixes from the host table to the LPM table, you must enable LPM CAM
partitioning for extended IPv6 prefixes. See Configuring the LPM Table for IPv6 Extended Prefixes for more information.
284 Equal Cost Multi-Path (ECMP)