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ASAI Maintenance Capabilities
11-6
Issue 7 May 1998
sends a Restart Acknowledgement message insisting on a version not supported
by the ECS, the link is not initialized and an error is logged.
by the ECS, the link is not initialized and an error is logged.
Adjuncts without the versions procedure are able to perform pre-G3V4 RESTART
procedures unchanged (in other words, RESTart — RESTart ACK). In these
cases, the ASAI link comes up with the default version.
procedures unchanged (in other words, RESTart — RESTart ACK). In these
cases, the ASAI link comes up with the default version.
1. ECS-initiated restart - Adjunct-supporting link versions
■
The ECS makes a Restart Request, listing the link versions that it
supports.
supports.
■
The adjunct responds with a Restart ACK, choosing one of the
supported versions.
supported versions.
■
The link is now in the “layer 3 restarted” state, and the link version is
set to the chosen version. The ECS then sends a heartbeat. If the
adjunct acknowledges (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.)
set to the chosen version. The ECS then sends a heartbeat. If the
adjunct acknowledges (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.)
2. ECS-initiated Restart - adjunct not supporting link versions
■
The ECS makes a Restart Request, listing the link versions that it
supports.
supports.
■
The adjunct responds with a Restart ACK, without specifying a link
version.
version.
■
The link is now in the “layer 3 restarted” state, and the link version is
set to Version 1. 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 the
"Heartbeat" section in this chapter.)
set to Version 1. 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 the
"Heartbeat" section in this chapter.)
3. Adjunct-initiated restart - ECS supports chosen link version
■
The adjunct makes a Restart Request, listing the link versions that it
supports.
supports.
■
The ECS responds with a Restart ACK, choosing one of the
supported versions. The ECS prefers higher link versions when
making the choice.
supported versions. The ECS prefers higher link versions when
making the choice.
■
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.
sends a heartbeat, the ECS will respond with a heartbeat ACK. At
that point, the link will go into the “layer 3 established” state.
4. Adjunct-initiated restart - adjunct not supporting link versions
■
The adjunct makes a Restart Request, without listing any link
versions.
versions.
■
The ECS responds with a Restart ACK, choosing link version 1.