I am not sure why router FISH would need a virtual link setup on it as it already has connectivity to the backbone because BEEF is the ABR and has an interface in area 0
OSPF Virtual Link
Scenario:
You are a freelance network engineer specialized in routing and switching. One of your customers (a local butcher) has some trouble setting up their OSPF network. Some of the networks are not reachable and it's up to you to provide them with a solu
Goal:
- All IP addresses have been preconfigured for you as specified in the topology picture.
- Each router has a loopback0 interface.
- Configure OSPF on all routers.
- Ensure you restore connectivity for the discontigious backbone area 0.
- Ensure area 2 has connectivity to the backbone area.
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IOS:
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Topology:
Video Solution:
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Comments (5)
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daliusgikaras 2012-03-29 08:05:38Router beef is internal area 1 router, not ABR. Virtual link between Pork an Chicken do not make router beef an ABR. So we need at least 2 virtual links i this lab:
1. Pork - Chicken
2. Fish - Pork or Fish - Chicken
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ReneMolenaar 2012-04-01 09:52:39This is correct. Router Beef is just an internal router for area 1. Fix those two virtual links and you have fixed this issue.
Keep in mind you can also use GRE tunnels instead of the virtual links to fix these problems. That's not something you would normally do but it's something the CCIE students should remember
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Dardoufa 2012-05-10 08:27:00Hello
Out of curiosity I wanted to try out the solution with the GRE tunnels.
I use tunnels only to connect router Fish with router Chicken. For Chicken and Pork I use the virtual link.So, what I configured is this. 10.1.1.0/24 is used for the tunnel interface.
On Chicken:
interface Tunnel1
ip address 10.1.1.1 255.255.255.0
tunnel source FastEthernet0/0
tunnel destination 192.168.24.4router ospf 1
log-adjacency-changes
area 1 virtual-link 3.3.3.3
network 1.1.1.0 0.0.0.255 area 0
network 10.1.1.0 0.0.0.255 area 2
network 192.168.12.0 0.0.0.255 area 1On Fish:
interface Tunnel1
ip address 10.1.1.4 255.255.255.0
tunnel source FastEthernet0/0
tunnel destination 192.168.12.1router ospf 1
log-adjacency-changes
network 4.4.4.0 0.0.0.255 area 2
network 10.1.1.0 0.0.0.255 area 2
network 192.168.24.0 0.0.0.255 area 1Fish#sh ip ospf ne
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 1 FULL/DR 00: 00 :34 192.168.24.2 FastEthernet0/0
1.1.1.1 0 FULL/ - 00: 00 :35 10.1.1.1 Tunnel1And now I can ping:
Fish#ping 1.1.1.1 source lo0Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 4.4.4.4
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 44/53/68 msIs this the correct way to go about it?
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ReneMolenaar 2012-05-10 08:58:08
Yes that looks fine to me! Create a GRE tunnel, configure a subnet on it and run OSPF on it