configure vpex ring rebalancing

configure vpex ring rebalancing [auto | off]


In an Extended Edge Switching ring topology, places the "ring common" link between approximately equal length cascades.

Syntax Description

vpex Specifies Virtual Port Extender (VPEX).
ring Specifies ring topology changes.
rebalancing Places the ring common link between approximately equal length cascades.
auto Ring re-balancing will automatically run at the next ring convergence.
off Automatic ring re-balancing is disabled (default).


By default, ring re-balancing is disabled.

Usage Guidelines

This command controls the Extended Edge Switching ring re-balancing operation. Re-balancing may or may not take place at the time that ring formation is complete, depending on the setting of this command. An Extended Edge Switching ring consists of two configured Extended Edge Switching cascades of BPEs that are connected at their ends. The connected link is called the ring common link. The ring forms automatically. Two control plane cascades span all bridge port extenders (BPEs) in the ring, with each originating from a controlling bridge (CB) port and ending at the BPE that is connected to the other CB port. However, the data plane cascades remain as configured (that is, no data plane traffic crosses the common link). Re-balancing moves the ring common link so that the data plane cascades are approximately equal in length. The cost of doing this is a data plane disruption to some BPEs in the ring that is the same as that which would have occurred had a single link in the ring been broken. Re-balancing is a dynamic operation. It does not change the cascade configurations.

Changing this setting takes effect the next time that a ring experiences a new ring formation. There is no immediate effect.

You can view your re-balancing selection with the show vpex command.


The following example turns off ring re-balancing:
# configure vpex ring rebalancing off


This command was first available in ExtremeXOS 22.7.

Platform Availability

This command is available on the ExtremeSwitching X670-G2, X465, X590, X690,, 5420, and 5520 series switches.