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Packet Over SONET Module Installation and User Guide 3-85

Configuring and Monitoring APS Functions

As mentioned earlier, APS can also be applied to the interconnection of bridges.

Figure 3-19 illustrates a configuration where two PoS ports are members of the same

VLAN. Assume that, in this example, both PoS ports are configured to run BCP on the

common VLAN and bridge traffic for the VLAN across the SONET link. Assigning the

two PoS ports to the same APS group improves the resiliency of the bridged network

by enabling faster recovery from SONET line failures relative to that achieved by the

Spanning Tree Protocol (STP). This recovery is accomplished by simply performing a

local APS line switch. Because APS recovers at layer 1, the Spanning Tree Protocol does

not need to be informed of the line failure, and therefore, no time-consuming STP

reconvergence is necessary.

Figure 3-19: APS in bridging configuration

PoS_018

Working line

Group 1

Protection line

Group 1

ADM

VLAN

Ethernet

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Extreme Networks PoS Podręcznik Użytkownika Strona 133