Extended Edge Switching on Stacking

With Extended Edge Switching on Stacking, Extended Edge uses the stack, rather than Multi-switch Link Aggregation Group (MLAG), to provide redundancy to a Bridge Port Extender (BPE). This is done by having certain components of EXOS synchronize their primary and backup nodes with respect to the Extended Edge Switching state. The primary node performs all Extended Edge Switching controlling bridge functions while the backup is kept in sync with the primary. This simplifies configuration, as all stack switches are managed with a single configuration file and control point that resides on the elected primary switch. The backup switch can become the primary switch upon failure of the primary switch if the failure is caused by a crash, a power-off, or a management action.


All nodes in a stack running Extended Edge Switching must be controlling bridge capable. Any attempt to add a non-capable slot to a stack running Extended Edge Switching will fail. Enabling Extended Edge Switching on a stack that contains a non-capable node will fail.

You must use the same class of controlling bridge for both the primary and backup. For example, if an X465 series switch is the primary node, then the backup must also be an X465 series switch.

The primary-capable node in a stack that has the least maximum supported number of BPEs determines the maximum for the stack.

Supported Platforms

The following devices are supported as controlling bridges (CBs):

ExtremeSwitching X465 , X690, X590, 5420, 5520 series switches, and V300 and V400 BPEs.



The V300-8P-2T-W BPE requires PoE, and therefore can only connect to the ExtremeSwitching X465, 5420, and 5520 series switches.


ExtremeSwitching X670-G2 is not supported with Extended Edge Switching on Stacking.

New CLI Command

show vpex stacking