Cisco Systems 3130 User Manual
46-4
Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter 46 Configuring Fallback Bridging
Configuring Fallback Bridging
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.
(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.
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.
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.
Table 46-1
Default Fallback Bridging Configuration
Feature
Default Setting
Bridge groups
None are defined or assigned to a port. No
VLAN-bridge STP is defined.
VLAN-bridge STP is defined.
Switch forwards frames for stations that it has
dynamically learned
dynamically learned
Enabled.
Spanning tree parameters:
•
Switch priority
•
Port priority
•
Port path cost
•
Hello BPDU interval
•
Forward-delay interval
•
Maximum idle interval
•
32768.
•
128.
•
10 Mb/s: 100.
100 Mb/s: 19.
1000 Mb/s: 4.
100 Mb/s: 19.
1000 Mb/s: 4.
•
2 seconds.
•
20 seconds.
•
30 seconds.