Administrator 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 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 1/2
interface tengigabitethernet 1/3
link-bundle-monitor enable
Dell(conf-ecmp-group-5)#
RTAG7
RTAG7 is a hashing algorithm that load balances the traffic within a trunk group in a controlled manner. In order to effectively increase the
bandwidth of the LAG/Equal Cost Multiple Path routes, traffic is balanced across the member links. The balancing is performed by using
the RTAG7 hashing, which is designed to have the member links used efficiently as the traffic profile gets more diverse.
Hashing-based
load balancing is used in the following applications:
• L3 ECMP
• LAGs
• HiGig trunking
The RTAG7 hash scheme generates a hash that consists of the following two portions:
• The first portion is primarily generated from packet headers to identify micro-flows in the traffic. The Parameters that are considered
for hash computations by default in RTAG7 hashing is shown in the given example:
Dell#show load-balance
Load-Balancing Configuration For LAG & ECMP:
--------------------------------------------
IPV4 Load Balancing Enabled
IPV4 FIELDS : source-ipv4 dest-ipv4 vlan protocol L4-source-port L4-dest-port
IPV6 Load Balancing Enabled
IPV6 FIELDS : source-ipv6 dest-ipv6 vlan protocol L4-source-port L4-dest-port
Mac Load Balancing Enabled
MAC FIELDS : source-mac dest-mac vlan ethertype
Load Balancing Configuration for tunnels
ipv4-over-ipv4 Payload header
ipv4-over-ipv6 Payload header
ipv6-over-ipv6 Payload header
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Equal Cost Multi-Path (ECMP)