3Com 3500 manual MismatchDead, Down and reestablished

578CHAPTER 19: OPEN SHORTEST PATH FIRST (OSPF)

Field	Description
mismatchDead	Number of router dead interval mismatches that were detected
	Interpretation:
	■ A non-zero value is bad and means that some OSPF routers
	on the interface are configured with a different dead
	interval than this router. This prevents the router from
	becoming a neighbor with these other routers.
	This statistic is incremented under the following circumstances:
	■ When an OSPF Hello packet is received and the dead interval
	it defines is different from the dead interval configured on
	the OSPF interface.
mismatchHello	Number of Hello packet interval mismatches that have been
	detected
mismatchMask	Number of subnet mask mismatches that have been detected
packetXsumError	Number of packet checksum errors since the interface has
	come up
receiveDD	Number of database description packets that were received
	from valid OSPF neighbors.
	Interpretation:
	■ A non-zero value is OK.
	Database description packets are sent when forming
	adjacencies with valid neighbors. A large number of
	receiveDD packets in a network whose configuration has
	not changed could indicate that adjacencies are being torn
	down and reestablished.
	This statistic is incremented under the following circumstances:
	■ When an OSPF database descriptor packet from a valid OSPF
	neighbor is received.
receivedUnknown	Number of unknown LSAs that have been received