Expand Configuration and Management Manual (G06.24+)

Subsystem Description
Expand Configuration and Management Manual—523347-008
18-56
Expand-over-IP Connection Establishment
Active Connect Request
When the Expand-over-IP line-handler process issues an active connect request, it
attempts to initiate a connection by sending a Connect Command frame to the remote
Expand-over-IP line-handler process.
When the remote Expand-over-IP line-handler process receives the Connect
Command frame, it responds with a Connect Response frame. When the response is
received, the local Expand-over-IP line-handler process considers the line to be up.
Various path parameters are then exchanged with the remote Expand-over-IP line-
handler process.
If the local Expand-over-IP line-handler process does not receive a response within the
timeout period, it sends another Connect Command frame. It will continue to send
Connect Command frames indefinitely until a response is received.
The default connect timeout period is 60 seconds. You can alter the connect timeout
period with the Expand SCF TIMERRECONNECT attribute. (The TIMERRECONNECT
attribute does not correspond to an Expand modifier and can be changed only by using
the SCF interface to the Expand subsystem.)
You can limit the number of times the Expand-over-IP line-handler process will send a
Connect Command frame by specifying the MAXRECONNECTS modifier. If you
specify MAXRECONNECTS, you can also control what happens after the reconnect
limit has been reached by specifying the AFTERMAXRETRIES_PASSIVE or
AFTERMAXRETRIES_DOWN modifier.
Passive Connect Request
When the Expand-over-IP line-handler process issues a passive connect request, it
waits for an incoming Connect Command frame from the remote Expand-over-IP line-
handler process. You can cause the Expand-over-IP line-handler process to use the
passive connect method by specifying the CONNECTTYPE_PASSIVE modifier.
The passive connect request is successful when the Expand-over-IP line-handler
process receives a Connect Command within the connect timeout period. Once the
passive connect request is successful, the local Expand-over-IP line-handler process
considers the line to be up. Various path parameters are then exchanged with the
remote Expand-over-IP line-handler process.
If the connection request is not successful within the timeout period, the Expand-over-
IP line-handler process will continue to issue passive connect requests at regular
intervals until a Connect Command frame is received.
Note. Because UDP is a connectionless protocol, there is no actual connection to the remote
Expand-over-IP line-handler process.
Note. Because UDP is a connectionless protocol, there is no actual connection to the remote
Expand-over-IP line-handler process.