
Configuring Frame Relay Services
2-6
C
D
Router 1
B
A
Bridge port sees one
path to sites A and B
Router 2
Router 3
E
F
Site A Site B
Frame
Relay
Network
FR0008A
Before you configure hybrid access on your router, evaluate the types of routers in
your network. For example, if your network combines Series 5 routers, which
only run group access mode, with Series 7 or higher routers, which can run in
hybrid access mode, this combination may cause problems.
Using Hybrid Access for Transparent Bridging
In Figure 2-5, traffic is bridged between Site A and Site B. The bridge (Router 1)
is running on the Frame Relay interface, and its configuration has the PVCs
defined for group access mode.
Figure 2-5. Example of a Bridged Network
In this example, the bridge receives data from Site A. If the bridge does not
recognize the destination address, it tries to direct traffic through another bridge
port. However, with group access mode configured, the Frame Relay bridge port
views the paths to Site A and Site B as the same path. Because the bridge does not
send out data on the same port from which it just received data, the bridge does
not direct the data to Site B. In this example, you should use hybrid access mode.
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