Concept Guide

• 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.
Viewing an ECMP Group
NOTE: An ecmp-group index is generated automatically for each unique ecmp-group when you congure 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 congure ecmp-group with id 2 for link bundle monitoring. This ecmp-group is dierent from the ecmp-group index 2 that is
created by conguring routes and is automatically generated. These two ecmp-groups are not related in any way.
DellEMC(conf-ecmp-group-5)#show config
!
ecmp-group 5
interface tengigabitethernet 1/2/1
interface tengigabitethernet 1/3/1
link-bundle-monitor enable
DellEMC(conf-ecmp-group-5)#
Support for /128 IPv6 and /32 IPv4 Prexes in Layer 3 Host
Table and LPM Table
IPv6 enhancements utilize the capability on platform to program /128 IPv6 prexes in LPM table and /32 IPv4 prexes in Host table. Also
host table provides ECMP support for destination prexes in the hardware. The platform uses the hardware chip that supports this
behavior and hence they can make use of this capability.
CLI commands are introduced to move /128 IPv6 prex route entries and /32 IPv4 prex route entries from Host table to LPM table and
vice versa. When moving the destination prexes from Route to Host table, there is a possibility of getting into hash collision because the
Host table on the device is a Hash table. In this scenario, a workaround does not exist for the user having route entries programmed in host
table.
When the command is issued, you are prompted with a warning message stating that the command conguration can take eect on
existing prexes only when “clear ip route *” command is used. When you use the clear command, all the existing /32 IPv4 prex route
entries are reprogrammed in appropriate table. Also, all the other existing IPv4 entries are removed and reprogrammed as a result of the
clear command.
Dell EMC Networking OS releases earlier than Release 9.3(0.1) stores IPv6 /128 entries in Host table since it cannot be written in LPM
table, and IPv4 0/32 route entries are written in LPM table itself to support the ECMP since ECMP was not supported in Host table. On
the system, unied forwarding table (UFT) is enabled, and the host table size is bigger compared to the LPM. When you move the
IPv4 /32 route prex entry in host table, more space is obtained that can be utilized for other route prex entries.
Equal Cost Multi-Path (ECMP)
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