Posted on February 10, 2021 4:14 pm
 |  Asked by saverio Giuntini
 |  23 views
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Hello,

does anyone know if Arista DCS-7060CX-32S supports symmetric hashing for LAG?

Can’t find the answer here, as 7060 is not mentioned:

https://www.arista.com/en/um-eos/eos-port-channels-and-lacp#xx1151429

 

1
Posted by Manoaj
Answered on February 10, 2021 6:25 pm

Hello Saverio Giuntini,

Arista DCS-7060CX-32S supports symmetrical hashing for LAG. We can use the following command to check the current hash function and fields enabled
switch#show port-channel load-balance trident fields.

To change the hash fields we can use the following command
switch(config)#port-channel load-balance trident fields <fields>
switch(config)#port-channel load-balance trident fields ?  ---> this gives the list of possible fields
gre          Configure which GRE fields are inputs to the port channel hash
ip            Configure which fields are inputs to the port channel hash for IP packets
ipv6        Configure which fields are inputs to the port channel hash for IPv6 packets
mac         Configure which MAC fields are inputs to the port channel hash
mac-in-mac  Configure which MAC-in-MAC fields are inputs to the port channel hash
mpls        Configure which MPLS fields are inputs to the port channel hash

For example, By configuring to hash just the Source-IP, We  enable the hashing source IP address and the other configurable IP fields are disabled:
switch(config)#port-channel load-balance trident  fields ip source-ip
switch(config)#show port-channel load-balance trident fields
Hash seed is 0
Hash  function is CRC32HI
Hash  offset is 16
.....
IP protocol field hashing is ON
IP source address hashing is ON
IP destination address hashing is OFF
IP TCP/UDP source port hashing is OFF
IP TCP/UDP destination port hashing is OFF
IP TTL hashing is OFF
IP symmetric hashing is OFF
.....

Hope this answers your query. In case you have any additional questions or need any further clarifications, please feel free to reach out to support@arista.com

Thanks,
Manoaj

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