Administrator Guide

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)#
BGP Multipath Operation with Link Bankwidth
BGP Link Bandwidth (LB) is a way to tell BGP to load-share in an unequal or weighted fashion.
LB is an optional, non-transitive Extended Community that indicates the cost of the (external) link in bytes per second. LB is similar to the
MED attribute and cannot extend beyond the neighboring AS.
The following network diagram depicts a scenario where a 10Gbps link connects the routers R2 and R4 and a 40Gbps link connects the
routers R3 and R5:
Figure 36. Sample BGP Link Bandwidth Configuration
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Equal Cost Multi-Path (ECMP)