This section describes other miscellaneous problems.
The HMCG Alarm messages are generated by the D7 package (SS7 Stack) when there are too many messages buffered for transmission. These messages indicate that new messages will be discarded until the "low-water mark" in the message buffer has been reached.
This message typically occurs when circuits are taken in and out of service, possibly when they are under heavy call load. If large numbers of these messages are occurring, revisit Planning. However if the problem occurs in small bursts around circuits being taken in and out of service, it is possible to change the "high-water mark" to a higher value.
If you suspect that the SS7 cluster is having LAN problems, check whether SS7 Machines are reporting other machines appearing, and then disappearing from the LAN.
Most LAN configurations are set for auto-negotiation, which typically configures at 100 MB per second, full duplex. However some machine types (for example H80), when set for auto-negotiation, select half duplex which causes problems on the LAN. You can check this by entering the AIX command entstat –d <LAN device>, where <LAN device> is the interface being used, for example en0.
Media Speed Selected: Auto negotiation Media Speed Running: 100 Mbps Full DuplexIf the "Speed Running" is not set to Full Duplex, contact your AIX expert to correct the status.
Occasionally, the D7 package may report unexpected primitives. These are warnings and are not necessarily errors. A primitive is likely to be "unexpected" because it is out of sequence. This typically occurs when both parties release at the same moment in time.
However if this occurs in more than 1 in 100 calls it may suggest there is a problem in the ISUP variant being used. In this case you should contact your IBM representative for more information.