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Verifying the health of EE connection z/OS Communications Server: SNA Network Implementation Guide SC27-3672-01 |
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VTAM® sends a Logical Data Link Control (LDLC) probe to the remote partner to determine whether all ports are accessible during the activation of the EE connection by default. EE health verification for this connection activation fails if VTAM does not receive a response, or receives an error response, from the remote partner. VTAM also verifies the health of EE connections at other user-specified time intervals. To do this, VTAM sends an LDLC probe to the remote partner on a user-specified interval. If the LDLC probe does not reach any port, VTAM issues the eventual action error message if it is not already present. The eventual action error message stays on console until the customer clears the message or all active EE connections receive successful EE health verification during the most recent LDLC probe. The D NET,EE,LIST=EEVERIFY command displays all lines that failed EE health verification during the most recent LDLC probe. The D NET,EE,ID=puname or linename command displays EE health verification information of the most recent LDLC probe for a particular connection. VTAM provides the EE health verification information of the most recent LDLC probe to the NMI application upon its request. It includes success and failure information for all ports and contains the round-trip time information. VTAM issues the
health verification failure message if health verification fails during
the activation of EE connection when it sends the LDLC probe to their
remote partner.
During the activation of the EE connection, VTAM senda Logical Data Link Control (LDLC)
probes to the remote partner to determine whether all the five ports
are accessible. VTAM does not
receive a response to any of the LDLC probe requests. VTAM continues with the activation of the EE
connection between this node and the remote partner. Because VTAM receives no replies to its
LDLC probe requests, VTAM determines
that the remote partner does not support EE health verification and VTAM issues the following message:
When the EE Health verification fails on active connections, VTAM issues the following eventual
action message. This message remains on the console until a subsequent
LDLC probe to the remote partner is successful or is erased by the
operator.
When you see the above message, you can issue the D NET,EE,LIST=EEVERIFY
command to display each line, which failed health verification on
the most recent LDLC probe to its remote partner. The command displays
the following message for each line with the line name, pu name, date
and time.
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