Reference Guide

ManualsBrandsDell ManualsAccess PlatformsPowerSwitch S4112F-ON/S4112T-ON

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Equal cost multi-path

ECMP is a routing technique where next-hop packet forwarding to a single destination occurs over multiple best paths. OS10 uses a

hashing algorithm to determine the next-hop when you enable ECMP. The hashing algorithm makes hashing decisions based on values in

various packet elds as well as some internal values.

• Congure the hash algorithm in CONFIGURATION mode.

hash-algorithm ecmp {crc | xor | random}

Change hash algorithm

OS10(config)# hash-algorithm ecmp crc

Load balancing

RTAG7 is a hashing algorithm that load balances trac within a trunk group in a controlled manner. To eectively increase the bandwidth of

ECMP routes, trac is balanced across member links. The balancing is performed by using the RTAG7 hashing, which is designed to have

the member links used eectively as the trac prole gets more diverse.

The RTAG7 hash scheme generates a hash that consists of two parts:

• The rst part is primarily generated from packet headers to identify micro-ows in trac. By default, all listed parameters are enabled

for load balancing except the ingress port.

OS10# show load-balance

Load-Balancing Configuration For LAG and ECMP:

----------------------------------------------

IPV4 Load Balancing : Enabled

IPV6 Load Balancing : Enabled

MAC Load Balancing : Enabled

TCP-UDP Load Balancing : Enabled

Ingress Port Load Balancing : Disabled

IPV4 FIELDS : source-ip destination-ip protocol vlan-id l4-destination-port l4-source-port

IPV6 FIELDS : source-ip destination-ip protocol vlan-id l4-destination-port l4-source-port

MAC FIELDS : source-mac destination-mac ethertype vlan-id

TCP-UDP FIELDS: l4-destination-port l4-source-port

• The second part comes from static physical conguration such as ingress and egress port numbers.

You can change the hash eld to generate load balancing based on any parameters using the load-balance command. The example

shows how to enable the ingress port to generate load balancing based on the ingress parameter.

OS10(config)# load-balancing ingress-port enable

OS10(config)# do show load-balance