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ASAI Maintenance Capabilities
Issue 7 May 1998
11-7
■ The link is now in the “layer 3 restarted” state. If the adjunct then
sends a heartbeat, the ECS will respond with a heartbeat ACK. At
that point, the link will go into the “layer 3 established” state.
5. ECS-initiated restart - adjunct requests unsupported link version
■ The ECS makes a Restart Request, listing the link versions that it
supports.
■ The adjunct responds with a Restart ACK, choosing a link version
which is not supported on the ECS.
■ The ECS ignores the Restart ACK. The link remains in the “layer 3
restarting” state. When a two-minute timer expires, the ECS
requests a Restart again.
6. Adjunct-initiated restart - adjunct lists only unsupported link versions
■ The adjunct makes a Restart Request, listing the link versions that it
supports.
■ The ECS ignores Restart Request. (The ECS may terminate all the
active associations at this time.) The link remains in the state that it
was in when the restart was requested. The adjunct does not
receive a Restart ACK.
7. Adjunct-initiated restart - many associations active
■ The adjunct makes a Restart Request, listing the link versions that it
supports.
■ The ECS needs additional time to initialize data associated with the
active associations. Once that is done, the ECS makes a Restart
Request, listing the link versions that it supports.
■ The adjunct responds with a Restart ACK, choosing one of the
supported versions.
■ The link is now in the “layer 3 established” state, and the link version
is set the chosen version. The ECS then sends a heartbeat. If the
adjunct ACKs the heartbeat, the link will go into the “layer 3
established” state. This is the state in which the link is operational.
(See ‘‘Heartbeat’’ on page 11-2 in this chapter.)