05-12-2012 10:38 PM - edited 03-07-2019 06:40 AM
Hi all,
I have the Lab setup like below
R1 area 0
R2 is ABR area 0 and 20
R3 is connected to R2 and R4 in Area 20 only.
R3 is an ASBR *****************************************************************************************************
R4 is connected to R3 and R5 Area 20 and area 12 only.
R5 is Area 12 only connected to R4.
R5 is an ASBR *******************************************************************************************************
I have created Virtual link between R2 and R4 but link on both ends shows down.
Thanks
Message was edited by: mahesh parmar
Solved! Go to Solution.
05-13-2012 10:23 AM
So, here it is. try a link between r5 and r2. You virtual link would transit through area 20
05-13-2012 10:28 AM
Hi Mahesh,
Try following this link:
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801ec9ee.shtml
HTH
05-15-2012 06:55 AM
Hi Mahesh,
The purpose of defining a virtual link is to "connect" an area to Area 0. If I understand correctly from your post, you have Area 12 which is not directly connected to Area 0. In this case, you have to make a virtual link between one of the ABRs of Area 0 to one of the ABRs of Area 12.
In the above case, you have to make a virtual link between R2 and R3 and it will look like that:
R2:
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
area 20 virtual-link 3.3.3.3
network 10.10.12.2 0.0.0.0 area 0
network 10.10.23.2 0.0.0.0 area 20
R2#sh ip os int b
Interface PID Area IP Address/Mask Cost State Nbrs F/C
VL0 1 0 10.10.23.2/24 10 P2P 1/1
Fa0/0 1 0 10.10.12.2/24 10 DR 1/1
Fa0/1 1 20 10.10.23.2/24 10 BDR 1/1
R3:
router ospf 1
router-id 3.3.3.3
log-adjacency-changes
area 20 virtual-link 2.2.2.2
network 10.10.23.3 0.0.0.0 area 20
network 10.10.34.3 0.0.0.0 area 12
R3#sh ip os int b
Interface PID Area IP Address/Mask Cost State Nbrs F/C
VL0 1 0 10.10.23.3/24 10 P2P 1/1
Fa0/0 1 12 10.10.34.3/24 10 BDR 1/1
Fa0/1 1 20 10.10.23.3/24 10 DR 1/1
Now, R3 virtually has an interface in Area 0, even though it is not connected to Area 0.
Hope this helps.
05-15-2012 12:01 PM
Hey Mahesh18,
Based on the information you've provided above...below I've drawn your OSPF design (dashed line is the virtual link).
If my drawing is accurate then the following steps will connect area 12 to area 0 and get you on your way. Note: This assumes all interfaces are up and reachable.
1. On R4 - under the OSPF process configure the following
- area 20 virtual-link [R2 router-id]
2. On R2 - uncer the OSPF process configure the following
- area 20 virtual-link [R4 router-id]
That's all there is... Hope this helps!
05-13-2012 02:16 AM
Mahesh,
umm where you setting up the virtual link seems to be ok. umm cant tell unless we see some more information. hows the ip addressing and all . Are the devices able to see each other. I mean R2 and R3.
Maybe this link will give some information on virtual links
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801ec9ee.shtml
can you please post a diagram so that its more clear how its all connected.
Regards, Kishore
05-13-2012 08:02 AM
Hi Kishore,
Unfortunately i have no diagram yet.
R2 can only see R3s interface which are directly connected.
R2 is unable to see the interface IP of R3 which connects to R4.
Thanks
MAhesh
05-13-2012 10:09 AM
Hi Mahesh,
Is this your setup?
If yes, you need a virtual link between r5 and r2
05-13-2012 10:16 AM
Hi Reza,
My setup is like this
R1 is in Area 0 and has physical connection to R2.
R2 has 1 interface in area 0 and 1 interface in area 20.
R3 has 2 physical interfaces and they are connected to R2 and R4.
R3 is in area 20 only.
R4 has 1 interface in area 20 and 1 interface in area 12.
R5 has physical connection to R4 .
R5 is in area 12 only.
I hope this helps
Thanks
MAhesh
05-13-2012 10:17 AM
Let me try link betwwen r5 and r2
thanks
05-13-2012 10:23 AM
So, here it is. try a link between r5 and r2. You virtual link would transit through area 20
05-13-2012 10:29 AM
Hi Reza,
Thanks for making nice diagram.
I tried between R2 and R5 using area 20 still down.
Just let you know R3 and R5 are ASBR *******************
i am not sure that will have any effect on virtual link or not?
thanks
MAhesh
05-13-2012 10:25 AM
Hi Reza,
I created Virtual link between R5 and R2 using area 20 still it is down down
05-13-2012 10:28 AM
Hi Mahesh,
Try following this link:
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801ec9ee.shtml
HTH
05-13-2012 11:05 AM
Hi Reza,
I read the document and now tried virtual link between R2 and R2 area 20 still down down
Thanks
MAhesh
05-13-2012 11:14 AM
Hi Mahesh,
Do you mean r2 and r5?
r3 and r4 are already connected to area 0, so you would need a virtual link from r5 to r2 transiting r4.
HTH
05-13-2012 01:17 PM
Hi Reza,
As per your 2nd diagram i tried r 2 and r5 then r2 and r4 still no luck
thanks
mahesh
05-13-2012 04:24 AM
Dear Mahesh,
You havent mentioned Area 2 in your topology description, whereas your " shows ip ospf" shows one of your interfaces in Area 2.
05-13-2012 08:06 AM
Hi Daud,
Area BACKBONE(0) (Inactive)
Number of interfaces in this area is 2 (1 loopback) *****************************
This tells number of interaces in this area is 2 not area number if i am correct.
Thanks
MAhesh
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