Fallback Bridging And Switch Stacks; Configuring Fallback Bridging - Cisco WS-C3750-48PS-S Software Configuration Manual

Chapter 38

Configuring Fallback Bridging

Fallback Bridging and Switch Stacks

When the stack master fails, a stack member becomes the new stack master by using the election process
described in
spanning-tree instance, which temporarily puts the spanning-tree ports used for fallback bridging into a
nonforwarding state. A momentary traffic disruption occurs until the spanning-tree states transition to
the forwarding state. All MAC addresses must be relearned in the bridge group.
If a stack master running the EMI fails and if the newly elected stack master is running the SMI, the
Note
switch stack loses its fallback bridging capability.
If stacks merge or if a switch is added to the stack, any new VLANs that are part of a bridge group and
become active are included in the VLAN-bridge STP.
When a stack member fails, the addresses learned from this member are deleted from the bridge group
MAC address table.
For more information about switch stacks, see
Configuring Fallback Bridging
These sections describe how to configure fallback bridging on your switch:
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•
•
•
78-16180-02
Chapter 5, "Managing Switch Stacks."
Default Fallback Bridging Configuration, page 38-4
Fallback Bridging Configuration Guidelines, page 38-4
Creating a Bridge Group, page 38-4
Adjusting Spanning-Tree Parameters, page 38-6
The new stack master creates new VLAN-bridge
Chapter 5, "Managing Switch Stacks."
(required)
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Catalyst 3750 Switch Software Configuration Guide
Configuring Fallback Bridging
38-3