Reference Guide

header are processed when hashing is performed for packets over LAG and ECMP
links. The Flex Hash functionality enables you to configure a packet search key and
matches packets based on the search key. When a packet matches the search key,
two 16-bit hash fields are extracted from the start of the L4 header and provided as
inputs (bins 2 and 3) for RTAG7 hash computation. You must specify the offset of
hash fields from the start of the L4 header, which contains a flow identification
field.
You can cause the system to include the fields present at the offsets that you
define (from the start of the L4 header) as a part of LAG and ECMP computation.
Also, you can specify whether the IPv4 or IPv6 packets must be operated with the
Flex Hash mechanism.
Example
Dell(conf)# load-balance flexhash ipv4 ip-proto 1 desc offset1
1 offset2 2
load-balance ingress-port enable
Enable the Flex hash functionality. This utility is supported on the C9000 platform.
Syntax
load-balance ingress-port enable
To disable the Flex hash capability, use the no version of this command.
Default None
Command Modes CONFIGURATION mode
Command History
This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9.(0.0) Introduced on the C9010.
9.3(0.0) Introduced on the S6000 platform.
Usage Information Flex hash uses the RTAG7 bins 2 and 3 (overlay bins). These bins must be enabled
for Flex hash to be configured. These bins contain the source module and source
port information. These bins are disabled by default in releases of Dell Networking
OS earlier than Release 9.3.0.0. The default behavior of disabling of these bins
occurs because of incorrect egress port information that would otherwise be
displayed in the output of the diagnostic show command of show ip flow.
As a result, when load balancing of RRoCE packets using Flex hash is enabled, the
show ip flow command is not functional. Similarly, when show ip flow
command operates (ingress port based load balancing is disabled) the hashing of
RRoCE packets is not operational.
824
Flex Hash and Optimized Boot-Up