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OSPF Configuration 257
[Switch B-ospf-1]area 1
[Switch B-ospf-1-area-0.0.0.1]network 197.1.1.0 0.0.0.255
[Switch B-ospf-1-area-0.0.0.1]vlink-peer 3.3.3.3
3 Configure Switch C:
[Switch C]interface Vlan-interface 1
[Switch C-Vlan-interface1]ip address 152.1.1.1 255.255.255.0
[Switch C]interface Vlan-interface 2
[Switch C-Vlan-interface2]ip address 197.1.1.1 255.255.255.0
[Switch C]router id 3.3.3.3
[Switch C]ospf
[Switch C-ospf-1]area 1
[Switch C-ospf-1-area-0.0.0.1]network 197.1.1.0 0.0.0.255
[Switch C-ospf-1-area-0.0.0.1]vlink-peer 2.2.2.2
[Switch C-ospf-1-area-0.0.0.1]quit
[Switch C-ospf-1]area 2
[Switch C-ospf-1-area-0.0.0.2]network 152.1.1.0 0.0.0.255
Troubleshooting OSPF OSPF has been configured in accordance with the above-mentioned steps, but OSPF
does not run normally on the router
Troubleshooting locally: Check whether the protocol between two directly
connected routers is operating normally. The normal sign is the peer state machine
between the two routers reaching the FULL state.
On a broadcast or NBMA network, if the interfaces for two routers are in DROther
state, the peer state machine for the two routers are in 2-way state, instead of FULL
state. The peer state machine between DR/BDR and all the other routers is in FULL
state.
■ Execute the display ospf peer command to view neighbors.
■ Execute the display ospf interface command to view OSPF information in the
interface.
■ Use the ping command to check whether the physical link and the lower level
protocol are normal. If the local router cannot ping the peer router, this indicates
that faults have occurred on the physical link and the lower level protocol.
■ If the physical link and the lower level protocol are normal, please check the OSPF
parameters configured on the interface. The parameters should be the same
parameters configured on the router adjacent to the interface. The same area ID
should be used, and the networks and the masks should also be consistent. (The
P2P or virtually linked segment can have different segments and masks.)
■ Ensure that the dead timer on the same interface is at least four times the value of
the hello timer.
■ If the network type is NBMA, the peer must be manually specified, using the peer
ip-address
command.
■ If the network type is broadcast or NBMA, there must be at least one interface
with a priority greater than zero.
■ If an area is set as the STUB area to which the routers are connected, the area on
these routers must be also set as the STUB area.
■ The same interface type must be adopted for neighboring routers.
■ If more than two areas are configured, at least one area should be configured as
the backbone area with an ID of 0.