Avaya Configuring ATM and MPLS Services Bedienungsanleitung PDF herunterladen (Seite 51)

100

101

Understanding ATM, MPOA, ATM Router Redundancy, and OAM

117374-C Rev 00

1-21

Using Hybrid PVCs for Transparent Bridging

In Figure 1-9

, traffic is bridged between site A and site B. The bridge (router 1) is

running on the ATM network interface, and its PVCs are not defined as

hybrid/bridged VCs.

Figure 1-9. Example of a Bridged Network

In this example, when the bridge receives data from site A and does not recognize

the destination address, it tries to direct traffic through another bridge port.

However, because the PVCs are not defined as hybrid/bridged VCs, the ATM

bridge port views the paths to site A and site B as the same.

A bridge does not send the same data over the bridge port from which it just

received the data, so the bridge cannot direct the data to site B. To resolve this

problem, you need to designate the PVCs on router 1 as hybrid/bridged VCs.

If you define the PVCs as hybrid VCs, each PVC acts as a separate bridge port.

This enables the bridge running on the ATM interface to view the traffic from

site A as arriving on a different port from that of site B. When the bridge sends

data, it now has access to all its ports, including the port that accesses site B.

Therefore, data from site A can reach site B.

Router 1

Bridge port sees one

path to Sites A and B

Router 2

Router 3

Site A Site B

ATM

network

ATM0013A

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