The DISPLAY EEDIAG,TEST=YES command, or Enterprise Extender connectivity test command, is useful for debugging network problems. Use this command to test an existing Enterprise Extender connection, or to assist in diagnosing why an EE connection cannot be established.

The EE connectivity test verifies EE line availability, address resolution capability, and ultimately partner reachability. Specify the DISPLAY EEDIAG,TEST=YES,LIST=DETAIL command to validate partner reachability. UDP requests with varying TTL (time-to-live) or hop count values are sent to the EE partner host. The command then waits for the routers between the local and remote hosts to send ICMP messages that indicate that the TTL value has been exceeded. If these messages are not received, the command provides the maximum number of retry attempts for that particular hop in the route. The DISPLAY EEDIAG,TEST=YES,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 or IST2138I displays the hop count of *NA.

The output generated for the DISPLAY EEDIAG,TEST=YES,LIST=SUMMARY command lists the remote partner reachability information quickly.

The output generated from this request shows the reachability of the remote EE endpoint over all five UDP ports reserved for EE. When multipath routing or policy-based routing is being used, all available routes to the remote EE endpoint that are calculated by the local TCP/IP stack are tested.