OSPF virtual link deployment - a step by step with actual combat can do

OSPF virtual links define
a zone by a non-backbone links connected to the backbone area
purpose virtual links
1 is connected through a non-backbone area region to a backbone area
2 is connected by a non-backbone area of a backbone area segment
virtual link configuration rule and characteristics
1 must be arranged in a virtual link between two routers ABR
2. the transport region is a distal region not
stability 3. virtual link depends on the stability of the region through
4. help provide virtual link logically redundant
configuration command virtual link

Router(config-router)#area area-id vritual-link router-id

Experimental Configuration FIG.
1, to prepare four routers (R2, R3 are all the ABR), two pc client;
2, provided Area0 backbone area, and a standard area area1 Area2;
the TIP: stability of this link depends area1 stability, if not stable enough area1 then this link is unstable.

R1 disposed
at both ends of R1 IP address configuration

arranged route ID, and the ID declared directly connected segment

R2 is configured to
configure the IP addresses are

configured route ID, and the ID declared directly connected segment

R3 configure
configure IP addresses are

configured route ID, declared directly connected network segment ID and

R4 configuration
configured IP addresses are

configured route ID, and the ID declared directly connected segment

configuration pc1 and pc2 address


at this time is two pc ping nowhere because we just no virtual chain in R2 Road, so in this case not learned R3 area2 area network segments (R3 routing table has no region of the network segment area2)
Next, we give it a virtual link configuration, first back end arranged R2

R2(config)#router ospf 1
R2(config-router)#area 1 virtual-link 3.3.3.3    //area1为穿越区域，写上R3的router-id

R3 is then arranged back end

R3(config)#router ospf 1
R3(config-router)#area 1 virtual-link 2.2.2.2    //area1为穿越区域，写上R2的router-id

Since virtual link configuration is complete, whether the test could interoperability

Conclusion: After you configure a virtual link, two pc capable of interoperability. And each of the routes learned information on all network segments, namely routing table contains all the network information. Set standard allows a virtual link to the backbone region spaced achieve interworking with a non-directly connected state.