Rtag7 - Dell S4048T Configuration Manual

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
ipv6-over-ipv4 Payload header
ipv4-over-gre-ipv4 Payload header
ipv6-over-gre-ipv4 Payload header
ipv4-over-gre-ipv6 Payload header
ipv6-over-gre-ipv6 Payload header
Equal Cost Multi-Path (ECMP) 372