Mac-rebalance – Brocade Network OS Command Reference v4.1.0 User Manual

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Network OS Command Reference

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mac-rebalance

Forces the rebalancing of EXM entries for the MAC tables.

Synopsis

mac-rebalance port-channel number {rbridge-id rbridge-id}

Operands

port-channel number Specifies the port-channel interface number. Valid values range from 1

through 6144 for Brocade VCS Fabric mode.

rbridge-id rbridge-id

Specifies the RBridge ID.

Defaults

None

Command Modes

Privileged EXEC mode

Description

Use this command to force the rebalancing of MAC table EXM entries.

To achieve complete utilization of the entire vLAG member links, MAC entries learnt on vLAG need
to be equally distributed among the vLAG member nodes. There are some scenarios, in which the
EXM entries may not be balanced equally among the vLAG member nodes.

Currently, EXM entries are balanced among the member nodes during RBridge membership
changes (add or delete). MACs learned on vLAG are not rebalanced when the link updates (such
as during LAG member additions or deletions), to avoid traffic disruption. However, when there are
many link updates, the EXM mapping can become unbalanced and eventually overload the link
capacity leading to frame drops. The mac-rebalance command corrects this scenario.

Usage Guidelines

Run this command on all remote (non-vLAG) nodes.

This command is applicable to remote RBridge nodes, such as non-vLAG member nodes. However
there are not any restrictions on the usage of this command in vLAG member nodes.

In Fabric Cluster mode, RBridge IDs other than the current node’s ID are not allowed.

This command does not function in standalone mode.

Examples

This example rebalances the EXM entries on RBridge 1 (for vLAG 10):

switch# mac-rebalance port-channel 10 rbridge-id 1