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Assume the following values: - LIVTIME=15
- SRQTIME=15
- SRQRETRY=3
If an EE connection is not receiving data from the partner for
15 seconds (LIVTIME), VTAM® sends
a test frame to test the connection. If the test does not receive
a response within 15 seconds (SRQTIME), VTAM repeats
this up to three more times (SRQRETRY). If after the third retry attempt
no response has been received, the EE connection is disconnected. VTAM uses the following formula:
LIVTIME + (SRQTIME* (SRQRETRY+1)). In this example, it would take
roughly 75 seconds to disconnect the EE connection. Figure 1 shows the Enterprise Extender inactivity
flows. Figure 1. Enterprise Extender inactivity flows
- a. Initial LIVTIME interval expires and no inbound HPR traffic
is detected by this EE endpoint during this 15-second interval.
- b. The Logical Data Link Control (LDLC) layer sends a TEST request
to the EE partner to determine whether the partner is still there.
This is the initial TEST, which is not considered a retry. The LIST=DETAIL
output for the D EEDIAG,SRQRETRY command will display the initial
test as attempt number zero in message IST2074I.
- c. After each TEST request is sent, VTAM waits a period of time equal to the SRQTIME
value (15 seconds in this example).
- d. No response is received from the partner within the SRQTIME
interval. The LDLC layer sends another TEST. This is considered the
second retry attempt up to a maximum of SRQRETRY value (three retries
for this example).
- e. After each TEST request is sent, VTAM waits a period of time equal to the SRQTIME
value (15 seconds in this example).
- f. No response is received from the partner within the SRQTIME
interval. The LDLC layer sends another TEST request. This is considered
the third retry attempt, which is the final retry in this example.
- g. After each TEST request is sent, VTAM waits a period of time equal to the SRQTIME
value (15 seconds in this example).
- h. No response is received from the partner within the SRQTIME
interval. The LDLC layer sends another TEST request. This is considered
the third retry attempt, which is the final retry in this example.
- i. After the final TEST request is sent, VTAM waits a period of time equal to the SRQTIME
value (15 seconds in this example). Because this was the final retry
attempt, and no response was received from the partner EE node, the
EE connection is terminated with message IST1430I.
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