Information Technology Reference
In-Depth Information
Figure20-6 The Bridge-Group Virtual Interface Brings Routing to Bridge Group 1
Bridge IRB
Interface E0
IP address X
Interface E1
IP address Y
Interface E2
Bridge-group 1
Interface E3
Bridge-group 1
Interface bvi 1
IP address Z
Bridge 1 protocol IEEE
BVI1
Bridge-
group 1
E0
E1
E2
E3
The Bridge-Group Virtual Interface brings routing to bridge-group1. One can assign an IP address to
the whole bridge group and routed communication is now possible between a host connected to E0
and a host connected to E2, for instance.
The BVI is a virtual interface within the router that acts like a normal routed interface that represents the
corresponding bridge group to routed interfaces within the router. The interface number of the BVI is
the number of the bridge group that this virtual interface represents. The number is the link between this
BVI and the bridge group. The sample principle applies to the Route Switch Module in a Catalyst
Switch, as shown in Figure 20-7.
Figure20-7 Route Switch Module in a Catalyst Switch
Int VLAN1
Int VLAN2
RSM
Ports in VLAN1
Ports in VLAN2
The IRB concept is also used (but hidden) on the Catalyst Route Switch Module (RSM).
The VLAN interfaces are virtual interfaces connecting different bridge groups (the VLANs).
Troubleshooting Transparent Bridging
This section presents troubleshooting information for connectivity problems in transparent bridging
internetworks. It describes specific transparent bridging symptoms, the problems that are likely to cause
each symptom, and the solutions to those problems.
Problems associated with source-route bridging (SRB), translational bridging, and
source-route transparent (SRT) bridging are addressed in Chapter 10, “Troubleshooting
IBM.”
Note
