Understanding the EE connectivity test output

Because the EE connectivity test is a potentially long-running command, the display output is broken into multiple sections. Some of the key messages in the first message group follow:

Message IST2119I displays a unique display correlator that can be used to coordinate the various message groups of the DISPLAY EEDIAG command.
Message IST2067I displays the date and time when the DISPLAY EEDIAG command was issued.
Message IST1680I displays the local and remote IP addresses of the EE connection that is being tested.
Message IST2023I displays the EE line that was selected to perform the EE connectivity test.
Message IST2126I is an informational message that indicates that the connectivity test has been initiated.

Some of the key messages in the second message group follow:

Message IST2130I is the header message in the EE connectivity test information message group.
Message IST2119I displays a unique display correlator that can be used to coordinate the various message groups of the DISPLAY EEDIAG command.
Message IST2131I displays the date and time when the EE connectivity test completed.
Message IST2132I displays the version of the LDLC probe that VTAM® is using to perform the connectivity test. If the connectivity test is successful across at least one port, this message also contains the EE partner's LDLC probe version.
Message IST1680I displays the local and remote IP addresses of the EE connection that is being tested.
If a policy-based routing rule is defined for any EE traffic between the EE endpoints, then you will also receive the following messages:
- Message IST2224I is a header message displayed when a policy-based routing rule applies to EE traffic between the EE endpoints that are being tested for connectivity.
- Message IST2225I is a header for the display of EE UDP ports, route tables, and the policy routing rules when a policy-based routing rule applies to EE traffic.
- Message IST2226I displays the EE UDP ports and their associated route tables and policy routing rules when a policy-based routing rule applies to EE traffic. If a policy-based routing rule is not defined for an EE UDP port, then the policy routing rule NONE is specified. When the main routing table is being used (either a policy routing rule does not exist or the routing action indicates that the main routing table is being used), then the EZBMAIN route table is specified.
Message IST2133I displays the TCP/IP interface; when multipath routing or policy-based routing is being used, the EE connectivity test is performed over each TCP/IP interface that can be used to route EE traffic to the requested destination.
Message IST2135I indicates that the EE connectivity test was unsuccessful over this specific EE port.
Message IST2136I indicates that the EE connectivity test ended for this port because the limit specified by the MAXTIME value was exceeded.

The LIST=DETAIL connectivity test makes up to three attempts at contacting each hop in the route. The test for each specific hop (or TTL value) stops when a response is received from the hop. After a response is received, or after the third attempt, the TTL value is increased by 1 to test the next hop and the test continues. Message IST2137I displays the results of each hop test. To reduce redundant output, VTAM prints only the first hop that did not receive a response, and the last hop that did not receive a response.

The LIST=SUMMARY connectivity test makes up to three attempts to reach the remote partner after VTAM sets the TTL count to 255. Because VTAM sets the TTL count to 255, the hop count is not determined for the LIST=SUMMARY output. Message IST2137I displays the hop count of *NA.

The output in Performing an EE connectivity test shows that the LDLC probe used to test the connection did not receive any responses after the TTL reached a value of 2. The TTL was incremented by a value of 1 and retested. This was repeated until the TTL reached a value of 6. At this time, the maximum time limit allowed for the EE connectivity test (MAXTIME) was exceeded and the test ended. See the DISPLAY EEDIAG command in z/OS Communications Server: SNA Operation for more information.