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Cisco router redundancy

Posted on 2009-05-18
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Last Modified: 2012-06-27
Hi,

We have a Cisco 2851 router that is configured as the voice gateway for the Cisco phone system.

a. Can I get another 2851 (another another router with the required hardware) and configure VRRP or HSRP? Will either of these protocols work for a PRI (not internet) router?

Thanks!
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Question by:netman70
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by:Don Johnston
ID: 24416533
Yes.
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Author Comment

by:netman70
ID: 24417337
OK...how do I connect the (one) PRI I have from my phone provider to both routers to allow for failover? Can I even use GLBP or is it between HSRP and VRRP? Some more information would be helpful...
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by:Don Johnston
ID: 24417668
Oh...

No, you can't do that. I thought each router had it's own circuit.

You could have have the service provisioned into two separate fractional services with 12 timeslots going to each router.

But you can't terminate a PRI to two routers.

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Author Comment

by:netman70
ID: 24420201
But if I have "two separate fractional services with 12 timeslots going to each router" - I cannot use HSRP or VRRP since they are active/passive technologies?
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Don Johnston earned 500 total points
ID: 24420537
Well, you can. It's just not what I would call an optimal approach.

You could create two different HSRP groups. Each group would have a different active router. Then assign half the hosts to the virtual router for one group and the remaining to the other group. That way, half of your users would take one circuit and the remaining user would take the other.
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Author Comment

by:netman70
ID: 24478654
Sorry for the delay in getting back to you...Thanks for your input!
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