Dell Force10 S4810P Configuration Manual page 494

For the E-Series TeraScale and ExaScale, you can select one of 47 possible hash algorithms (16 on
EtherScale).
Command Syntax
hash-algorithm {algorithm-number} |
{ ecmp { checksum|crc|xor }
[number]} lag
{checksum|crc|xor][number]} nh-ecm
p {[checksum|crc|xor] [number]}}|
{ linecard number ip-sa-mask value
ip-da-mask value}
Note: E-Series systems require the
E-Series TeraScale
ExaScale
microcode.
The following example shows a sample configuration for the
FTOS(conf)#hash-algorithm ecmp xor 26 lag crc 26 nh-ecmp checksum 26
FTOS(conf)#
On C-Series and S-Series, the
defaults from the E-Series. The default ECMP hash configuration is
of the hash key to compute the egress port. Other options for ECMP hash-algorithms are:
•
crc-upper
•
dest-ip
• — always uses the least significant bit of the hash key to compute the egress port
lsb
To change to another method, use the following command in the CONFIGURATION mode:
Command Syntax
hash-algorithm ecmp { crc-upper } |
{ dest-ip } | { lsb }
For more on load-balancing, see "Equal Cost Multipath and Link Aggregation Frequently Asked
Questions" in the E-Series FAQ section (login required) of iSupport:
https://www.force10networks.com/CSPortal20/KnowledgeBase/ToolTips.aspx
494
| Interfaces
Command Mode
CONFIGURATION
e
includes this microcode as an option with the Default cam profile. E-Series
t
e
systems require that a CAM profile be created and specifically include
x
hash-algorithm
— uses the upper 32 bits of the hash key to compute the egress port
— uses destination IP address as part of the hash key
Command Mode
CONFIGURATION
Purpose
Change the default (0) to another algorithm and apply
it to ECMP, LAG hashing, or a particular line card.
Note: To achieve the functionality of hash-align on
the ExaScale platform, do not use CRC as an
hash-algorithm method. For ExaScale systems, set the
default hash-algorithm method to ensure CRC is not
used for LAG. For example,
lag checksum nh-ecmp checksum
For details on the algorithm choices, see the command
details in the IP Routing chapter of the
Command Reference.
microcode be configured in the in the CAM profile.
lag-hash-align
hash-algorithm
command is specific to ECMP groups and has different
Purpose
Change to another algorithm.
hash-algorithm ecmp xor
FTOS
lag-hash-align
command.
. This takes the lower 32 bits
crc-lower