Failover routers config 857

[pixieclarke]

Hi

I’m new to the site and new to the Cisco world, I’m currently training to take my CCNA,

So for the reason I’m here, I have just been asked to take over the company network.

And I need to know how I go about configuring some base level routers.

I have 3 remote sites and 1 main site, all these routers are using 857’s, with a VPN tunnel between them, this is running all OK and working fine,

But my boss has decided to have a second ADSL line installed in the main site for failover.

How do I go about configuring this, ie how do the VPN’s terminate on the other router when the main one goes down ??

Please excuse my lack of knowledge, but ever since I logged onto the routers I can put them down ,

Many Thanks

Paul

[sean_evershed]

Hi,

Do you mean that you are installing a second Cisco router in the main office? If so this link provides an example

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_tech_note09186a00800942f7.shtml

If it is just a another WAN link on the hub router you could look at configuring a second peer in your crypto map on the spokes. The second peer would be the IP address of the new ADSL link terminated on the hub router:

http://www.cisco.com/en/US/docs/ios/12_3/security/command/reference/sec_r1g.html

"The peer that packets are actually sent to is  determined by the last peer that the router heard from (received either  traffic or a negotiation request from) for a given data flow. If the  attempt fails with the first peer, Internet Key Exchange tries the next  peer on the crypto map list."