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Cisco, cisco router 2801 (Spoke router), 12.4 1c, hub & spoke topology

Posted on 2008-10-15
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Last Modified: 2012-08-13
How to configure loopback interface of 2801 router as a member of Bridge group ?

I have enabled bridging in cisco 2801  & config as follows.
bridge irb
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
 bridge-group 1

interface FastEthernet0/1
 no ip address
 duplex auto
 speed auto
 bridge-group 1

bridge 1 protocol ieee
bridge 1 route ip


 I have requirement that my bvi inetrface should remian up at all the time even though both Fast Eth goes down. So I have decided to make loopback as member of the bridge group 1

But  when i configue as,
int loopbak 10
bridge-group 1
it gives erros as "Loopback10 does not support bridging"

So let me the solution for the same ....



I am doing this because I have requirement that my bvi inetrface should remian up at all the time.

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Question by:nareshmy
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Expert Comment

by:Don Johnston
ID: 22719830
Loopback interfaces are for layer 3 operations.

If all the interfaces that are in the same bridge-group as the BVI are down, there is nothing for the BVI to communicate with. So do you need it to stay up in that situation?


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Author Comment

by:nareshmy
ID: 22719962
I want BVI interface to be up in any situation.
So for this oreason  I thought to add loopback interface as member of bridge group . but router is not allowing me to do so.




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Expert Comment

by:Don Johnston
ID: 22720021
I understand you "want" it to be up in any situation. What I'm asking is why.

If the all the interfaces associated with the BVI are down, then the BVI can't communicate with the network.

If you force the BVI up then when the network effectively down, routing protocols will continue to advertise the network as reachable.
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Author Comment

by:nareshmy
ID: 22720862
This I want beacuse I am having router with one 64kbps link & as per my cleint requirement I  am monitoing my router with CA monitoing tool  remotely with IP add of BVI interface so when both Fast Eth are down then  remote monitoring tool shows this router (Site) as a down .So to avoid this I thought to add loopback as bridge member.
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Expert Comment

by:Don Johnston
ID: 22720930
Use the other IP address on the router to monitor with.
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Author Comment

by:nareshmy
ID: 22721087
See
in future when new llink come & I will have then  two links of 64 kbps each

Then tool will monitor that bvi int & if one link will be down then also tool will be able to manage to reach it via another links  ofcourse with help of routing prortocol.

& If I use any physical IP of any one link then it will  be no use becoz when this link will be down then it will show it as site down.


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Don Johnston earned 250 total points
ID: 22721173
Then create a loopback interface and assign an ip address to the loopback interface for management.
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Author Comment

by:nareshmy
ID: 22721668
there is no way  that  I can make loopback interface as bridge group ?
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Expert Comment

by:Don Johnston
ID: 22721781
>there is no way  that  I can make loopback interface as bridge group ?

Like I said before, no.

Either use one of the other ip addresses on the router or create a loopback and assign an IP address to that.
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Author Comment

by:nareshmy
ID: 22722089
OK  Thanks...
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