configure forwarding hash-recursion-level

configure forwarding hash-recursion-level 0-3


Modifies hardware table utilization by configuring the dual hashing recursion level.

Syntax Description

0-3 Sets the maximum number of L3 hash buckets to modify to make room for a new entry.


The default is “1.”

Usage Guidelines

This command allows you to select the dual hashing “recursion level” for hardware with the dual-hash feature. The setting applies only if dual-hash is configured or defaulted to “on” using the configure forwarding hash-algorithm command.

The configured recursion level is the maximum number of existing hash entries to move in an attempt to add a new hash entry. A higher recursion level may provide better hash utilization at the expense of additional CPU processing. This command does not require a system reboot. However, the new recursion level takes effect only for addresses added after the command is issued.


The following command modifies the dual-hash recursion level to modify up to two L3 hash buckets in an attempt to add a new entry:

configure forwarding hash-recursion-level 2


This command was first available in ExtremeXOS 12.1.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.