Default Fallback Bridging Configuration; Fallback Bridging Configuration Guidelines; Creating A Bridge Group - Cisco WS-C3750-48PS-S Software Configuration Manual

Configuring Fallback Bridging

Default Fallback Bridging Configuration

Table 38-1
Table 38-1 Default Fallback Bridging Configuration
Feature
Bridge groups
Switch forwards frames for stations that it has
dynamically learned
Spanning tree parameters:
•
•
•
•
•
•

Fallback Bridging Configuration Guidelines

Up to 32 bridge groups can be configured on the switch.
An interface (an SVI or routed port) can be a member of only one bridge group.
Use a bridge group for each separately bridged (topologically distinct) network connected to the switch.
Do not configure fallback bridging on a switch configured with private VLANs.
All protocols except IP (Version 4 and Version 6), Address Resolution Protocol (ARP), reverse ARP
(RARP), LOOPBACK, and Frame Relay ARP are fallback bridged.

Creating a Bridge Group

To configure fallback bridging for a set of SVIs or routed ports, these interfaces must be assigned to
bridge groups. All interfaces in the same group belong to the same bridge domain. Each SVI or routed
port can be assigned to only one bridge group.
Note The protected port feature is not compatible with fallback bridging. When fallback bridging is enabled,
it is possible for packets to be forwarded from one protected port on a switch to another protected port
on the same switch if the ports are in different VLANs.
Catalyst 3750 Switch Software Configuration Guide
38-4
shows the default fallback bridging configuration.
Switch priority
Port priority
Port path cost
Hello BPDU interval
Forward-delay interval
Maximum idle interval
Chapter 38 Configuring Fallback Bridging
Default Setting
None are defined or assigned to a port. No
VLAN-bridge STP is defined.
Enabled.
32768.
•
128.
•
10 Mbps: 100.
•
100 Mbps: 19.
1000 Mbps: 4.
2 seconds.
•
20 seconds.
•
30 seconds.
•
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