Adjacency failures

OMPROUTE adjacency failures are reported when OMPROUTE is unable to establish adjacency with a neighboring router, or loses an established adjacency, over one of its network interfaces. The following error messages are used to report adjacency failures:

For IPv4:

EZZ7921I OSPF Adjacency Failure, neighbor neighbor, old state state,
 new state state, event event

For IPv6:

EZZ7954I IPv6 OSPF Adjacency Failure, neighbor neighbor, old state ostate, 
new state nstate, event event

In addition to the adjacency failure message, if the futile neighbor state loop detection is enabled in OMPROUTE (Max_Adj_Attempt parameter on OSPF and IPV6OSPF statements), the following error messages will be issued to report futile neighbor state loops for the adjacency attempts:

For IPv4:

EZZ8157I jobname IPv4 OSPF detected futile neighbor state loop with neighbor neighbor 
on interface interface after threshold_value adjacency attempts

For IPv6:

EZZ8157I jobname IPv6 OSPF detected futile neighbor state loop with neighbor neighbor 
on interface interface after threshold_value adjacency attempts

If OMPROUTE is configured with redundant parallel interfaces (primary and backup) attached to the same LAN segment, OMPROUTE will try to form adjacency with a neighboring designated router over the alternate redundant interface when the futile neighbor state loop has been detected on the problematic interface. The following informational messages will be issued to report the interface changes:

For IPv4:

EZZ8158I jobname IPv4 OSPF could not establish adjacency on interface interface1 - 
attempting to establish adjacency on interface interface2

For IPv6:

EZZ8158I jobname IPv6 OSPF could not establish adjacency on interface interface1 - 
attempting to establish adjacency on interface interface2

For information about the Max_Adj_Attempt parameter, see the OMPROUTE topic in z/OS Communications Server: IP Configuration Reference.

For information about futile neighbor state loops, see the topic about network design considerations with z/OS® Communications Server in z/OS Communications Server: IP Configuration Guide.

OMPROUTE adjacency failures can also occur during the processing of received OSPF packets that are malformed or unexpected. For example, a neighboring router can be sending an incorrectly built Link State Advertisement (LSA) or sending an unexpected AS External LSA for a stub area to OMPROUTE. For more information, see Malformed and unexpected packets.