3Com 5500-EI PWR Reference Manual page 330

Field
OSPF: packet size > ip length
OSPF: transmit error
OSPF: interface down
OSPF: unknown neighbor
HELLO: netmask mismatch
HELLO: hello timer mismatch
HELLO: dead timer mismatch
HELLO: extern option mismatch
HELLO: router id confusion
HELLO: virtual neighbor unknown
HELLO: NBMA neighbor unknown
DD: neighbor state low
DD: router id confusion
DD: extern option mismatch
DD: unknown LSA type
LS ACK: neighbor state low
LS ACK: wrong ack
LS ACK: duplicate ack
LS ACK: unknown LSA type
LS ACK: ACK length wrong
LS REQ: neighbor state low
LS REQ: empty request
LS REQ: wrong request
LS REQ: wrong length
LS UPD: neighbor state low
LS UPD: newer self-generate LSA
LS UPD: LSA checksum wrong
LS UPD:received less recent LSA
LS UPD: unknown LSA type
OSPF routing: next hop not exist
DD: MTU option mismatch
ROUTETYPE: wrong type value
LS UPD: LSA length wrong
OSPF packet size exceeds IP packet length
OSPF transmission error
OSPF interface is down, unavailable
OSPF neighbors are unknown
Network mask mismatch
Interval of HELLO packet is mismatched
Interval of dead neighbor packet is mismatched
Extern option of Hello packet is mismatched
Hello packet: Router ID confusion
Hello packet: unknown virtual neighbor
Hello packet: unknown NBMA neighbor
Database description (DD) packet: asynchronous neighbor
state
DD packet: router id unidentifiable
DD packet: external route flag error
DD packet: unknown LSA type
Link state acknowledgment (LS ACK) packet: asynchronous
neighbor state
Link state acknowledgment packet: ack error
Link state acknowledgment packet: ack duplication
Link state acknowledgment packet: unknown LSA type
Link state acknowledgment packet: ACK length error
Link state request (LS REQ) packet: asynchronous neighbor
state
Link state request packet: empty request
Link state request packet: erroneous request
Link state request packet: length error
Link state update packet: asynchronous neighbor state
Link state update packet: newer LSA generated by itself
Link state update packet: LSA checksum error
Link state update packet: received less recent LSA
Link state update packet: unknown LSA type
Next hop of OSPF routing does not exist
MTU option of DD packet is mismatched
Route type: the value of the type is wrong
Link state update packet: LSA length error
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Description