Load-Balance Flexhash - Dell S6100 Configuration Manual

load-balance flexhash

Specify the parameters for the Flex Hash mechanism, such as whether IPv4 or IPv6 packets must be subject to Flex Hash functionality, a
unique protocol number, the offset of hash fields from the start of the L4 header to be used for hash calculation, and a meaningful
description to associate the protocol number with the name.
Syntax
load-balance flexhash ipv4/ipv6 ip-proto <protocol number> <description string>
offset1 <offset1 value> [offset2 <offset2 value>]
To disable the Flex hash settings, use the no load-balance flexhash ipv4/ipv6 ip-proto
protocol number command.
Parameters
ipv4
ipv6
protocol number
description string
offset1 value
offset2 value
Default None
Command Modes CONFIGURATION mode
Command History
Version
9.10(0.0)
9.8(1.0)
9.3(0.0)
9.2(1.0)
Usage Information
With the introduction of various overlay technologies such as network virtualization using generic routing
encapsulation (NVGRE) segments and Routable Remote Direct Memory Access (RRDMA) over Converged
Ethernet (RRoCE), information related to a traffic flow is contained in the L4 header. The fields in the L2 and L3
headers are not sufficient to distinguish the flows. Therefore, the fields in the L4 header are processed when
hashing is performed for packets over LAG and ECMP links. The Flex Hash functionality enables you to configure a
Denotes whether Flex Hash needs to be enabled for IPv4 packets.
Denotes whether Flex Hash needs to be enabled for IPv6 packets.
Represents the Outer IPv4 protocol field in case of IPv4 packets, and the Outer IPv6 next
header field in case of IPv6 packets.
The ipv4/ipv6 keyword and the IP protocol value are used as keys to identify if a
duplicate flex hash configuration is already present. Duplicate flex hash configuration is
not possible. To change an existing flex hash configuration, you must delete the existing
flex hash attribute and configure the flex attribute afresh.
A description string is followed by the protocol number to enable you to associate the
protocol number with the protocol name in an easily-identifiable way. For example, for a
protocol number of 254, you can specify the description as RRoCE.
Specify the byte offset from the start of the L4 header from which the 2-byte data is
extracted and be used in hash computation. You must enter the offset as an even number.
The offset range is 0 – 30 bytes from start of L4 header.
(Optional) Specify the additional 2 bytes that must be extracted from the start of the L4
header to be used for hash computation. You must enter the offset as an even number.
The offset range is 0 – 30 bytes from start of L4 header.
Description
Introduced on the S6100-ON.
Introduced on the Z9100–ON.
Introduced on the S6000 platform.
Introduced on the Z9500.
Flex Hash and Optimized Boot-Up 591