Nortel Networks NN47200-503 manual Accessed by using the show ip ospf neighbor command

		IP routing configuration examples 189
3	Init	The router received a general hello packet (without
		its Router ID) from another router.
4	2-Way	The router received a Hello directed to it from
		another router. (The hello contains its Router ID)
5	ExStart	Indicates the start of the Master/Slave election
		process.
6	Exchange	Indicates the link state database (LSDB) is
		exchanged
7	Loading	Indicates the processing state of the LSDB for input
		into the routing table. The router can request LSA
		for missing or corrupt routes.
8	Full	Indicates the normal full adjacency state.
OSPF neighbor state information Neighbor state information can be
accessed by using the show ip ospf neighbor command.

5530-24TFD#show ip ospf	neighbor
Interface Nbr Router ID	Nbr IP Address	Pri State		RetransQLen	Perm
--------- -------------	--------------	--- -----		-----------	----
10.1.1.22 1.1.1.1	10.1.1.21	100 Full		0	Dyn
10.1.1.17 1.1.1.5	10.1.1.18	0	Full	0	Dyn
10.1.1.9 1.1.1.4	10.1.1.10	1	Full	0	Dyn

Problems with OSPF occur most often during the initial startup, when the router cannot form adjacencies with other routers and the state is stuck in the Init or ExStart/Exchange state.

Init State Problems A router can become stuck in an Init state and not form adjacencies. There are several possible causes for this problem:

•Authentication mismatch or configuration problem

•Area mismatch for Stub or NSSA

•Area ID mismatch

•Hello Interval or Dead Interval mismatch

To determine any mismatches in OSPF configuration, use the show ip ospf ifstats mismatch command.

ExStart/Exchange problems Even though routers can recognize each other and have moved beyond two way communications, routers can become stuck in the ExStart/Exchange state.

Nortel Ethernet Routing Switch 5500 Series

Configuration-IP Routing Protocols

NN47200-503 03.01 Standard

5.127 August 2007

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