VRF: Resilient Hashing

As a load-balancing method, resilient hashing helps to lessen the possibility that a destination path will be remapped when a LAG (Link Aggregation Group) link fails.

When you create or update a tenant VRF, you can enable ECMP resilient hashing and you can configure the maximum number of resilient hashing paths allowed (8, 16, or 64 paths). Resilient hashing is disabled by default. The default number of allowed paths is the same as the default value for the SLX devices.

When you create a tenant VRF, use the efa tenant vrf create command with the --rh-ecmp-enable and --rh-max-path parameters to enable resilient hashing and set the maximum number of allowed paths. For example:

# efa tenant vrf create --name <vrf-name> --tenant <tenant-name> 
--rh-ecmp-enable=true/false --rh-max-path <8 | 16 | 64>

When you update a tenant VRF, use the efa tenant vrf update command with the --rh-ecmp-enable and --rh-max-path parameters to enable resilient hashing and set the maximum number of allowed paths. For example:

# efa tenant vrf update --name <vrf-name> --tenant <tenant-name> 
--operation <rh-max-path-add | rh-max-path-delete | rh-ecmp-update> 
--rh-ecmp-enable=true/false --rh-max-path <8 | 16 | 64>

The --max-path and --rh-max-path parameters can co-exist.

You cannot choose the specific devices on which to configure resilient hashing. Configuration applies to all SLX devices in the tenant VRF.

For more information about the commands, including usage examples, see the Extreme Fabric Automation Command Reference, 2.4.0.