Cisco 6500 - Catalyst Series 10 Gigabit EN Interface Module Expansion Manual del usuario - Página 8

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VSL Link Loss and Recovery

If the VSL fails, the standby chassis cannot determine the state of the active chassis. In order to ensure that

switchover occurs without delay, the standby chassis assumes the active chassis has failed and initiates

switchover to take over the active role.

If the original active chassis is still operational, both chassis are now active. This situation is called a

dual−active scenario. A dual−active scenario can have adverse affects on network stability, because both

chassis use the same IP addresses, SSH keys, and STP bridge ID. The virtual switching system (VSS) must

detect a dual−active scenario and take recovery action.

The virtual switching system supports these three methods in order to detect a dual−active scenario:

•

Enhanced PAgP â€ Uses PAgP messaging over the MEC links in order to communicate between the

two chassis through a neighbor switch. Enhanced PAgP is faster than IP BFD, but requires a neighbor

switch that supports the PAgP enhancements.