Category:Cisco Systems -> Routing and Switching
Diagram:
If there’s no OSPF Virtual Link Between AREA 0 and AREA 3:
R3(config-router)#do ping 7.7.7.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:
U.U.U
Success rate is 0 percent (0/5)
R6#ping 7.7.7.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Router R3 and router R6 can’t see subnet 7.7.7.7 inside AREA 3.
Let’s create a virtual link on R4 towards R3. R4 and R3 must have a valid connection though AREA 2. So make sure the connection is in the routing tables of all routers inside AREA 2 through which the tunnel will be made.
R4(config-router)#area 2 virtual-link 10.10.10.10
R3(config-router)#
*Mar 1 00:54:43.651: %OSPF-4-ERRRCV: Received invalid packet: mismatch area ID, from backbone area must be virtual-link but not found from 192.168.6.1, FastEthernet1/0
R3(config-router)#area 2 virtual-link 7.7.7.7
R4(config-router)#
*Mar 1 01:01:39.131: %OSPF-5-ADJCHG: Process 1, Nbr 10.10.10.10 on OSPF_VL1 from LOADING to FULL, Loading Done
Let’s check this again:
R3(config-router)#do ping 7.7.7.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/30/44 ms
R6#ping 7.7.7.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/17/48 ms
R6#
