Wells Buchanan

Knowing when and how to generate an OSPF virtual link is an essential skill for BSCI and CCNP examination success, as well as how important it can be on your work! As a CCNA and CCNP choice, you know the idea of virtual links, so let's take a look at how-to configure a virtual link, along with some real-world tips that many CCNA and CCNP research courses leave out!

Within this arrangement, no hub with an interface in Area 4 features a physical interface in Area 0. This implies a logical relationship to Area 0, a virtual link, have to be developed.

Within the following case, R1 and R3 are adjacent and both have interfaces in Area 0. R4 has an adjacency with R3 via Area 34, but R4 advertising its loopback 4.4.4.4 in-to OSPF and is has no physical interface in Area 0. R1 doesn't have the path to that loopback.

R1#show ip path ospf

6.0.0.0/32 is subnetted, 1 subnets

O 6.6.6.6 [110/11] via 10.1.1.5, 01:05:45, Ethernet0

172.23.0.0/27 is subnetted, 1 subnets

E IA 172.23.23.0 [110/74] via 172.12.123.3, 00:04:14, Serial0

7.0.0.0/32 is subnetted, 1 subnets

E 7.7.7.7 [110/11] via 10.1.1.5, 01:05:45, Ethernet0

To eliminate this, a virtual link is going to be built between R-3 and R4 through Area 3-4. The area by which the virtual link is made, the transportation area, can't be a stub area of all kinds. Dig up more on in english by navigating to our disturbing essay.

R4( config )#router ospf 1

R4( config-router )#area 34 virtual-link 3.3.3.3

R3( config )#router ospf 1

2d07h: %OSPF-4-ERRRCV: Received broken packet: mismatch area ID, from anchor area has to be virtual-link however not found from 172.23.23.4, Ethernet0

R3( config )#router ospf 1

R3( config-router )#area 34 virtual-link 4.4.4.4

R3( config-router )#^Z

2d07h: %OSPF-5-ADJCHG: Process 1, Nbr 4.4.4.4 on OSPF_VL0 from LOADING to FULL, Loading Done

A few details worth noting... This stately linkemperor article has endless engaging suggestions for the purpose of it. the virtual link command uses the remote device's RID, definitely not the IP address on the screen that's in the flow