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Backup routing using Cisco 3550

Posted on 2004-10-06
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Last Modified: 2010-04-12
I have a Cisco 3550 EMI switch which is the default gateway of my all hosts in my LAN. I have a point-to-point link to a client site which terminates on a Cisco 2610 router and the router is connected to the 3550. I have a Cisco PIX firewall from where I have a VPN to the same client site. The trusted interface of the PIX terminates on the 3550 as well.

Now I want that when the point-to-point link goes down ... all traffic should automatically be routed through the VPN. Please let me know the configuration that should be done in the switch to achieve this.

Regards,
Anindya.
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Question by:mitra_am
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lrmoore earned 125 total points
ID: 12236273
You need some type of dynamic routing taking place between the router and the 3550 so that if the router's WAN interface drops, it will notify the 3550..

Something like this:

2610:
 ip route 0.0.0.0 0.0.0.0 <upstream ip>
  router ospf 222
   network 192.168.122.0 0.0.0.255 area 0  <== subnet of Ethernet 0/0
   default-information originate

3550:
  router ospf 222
   network 192.168.122.0 0.0.0.255 area 0
  ip route 0.0.0.0 0.0.0.0 <ip of PIX> 120  <== metric higher than the 110 from ospf

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by:lrmoore
ID: 12236290
Assuming you can get the router at the other end of the point-to-point to participate in ospf, that would be better. As a matter of fact, even the PIX FW can participate in ospf.

Your issue may be that even though your side works, the other side might not. You'll have to get all peices involved together with one plan.
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by:lrmoore
ID: 13737566
Do you need any more assistance or information?
Can you close out this long-forgotten question?
Here's how:
http://www.experts-exchange.com/help.jsp#hs5

Thanks!
<8-}
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