3Com SuperStack II 9300 Command Reference Manual page 545

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 were detected
mismatchMask Number of subnet mask mismatches that were detected
packetXsumError Number of packet checksum errors since 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 re-established.
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 were received
ip ospf interface statistics 545