-----Original Message----- From: barney gumbo [mailto:barn...@gmail.com] Sent: Wednesday, January 05, 2005 12:53 PM To: Kern, Tom Subject: Re: [c-nsp] eigrp question

Is there a router beyond (outside) the firewall? If so, GRE over EIGRP will get the EIGRP packets through the firewall. In other words, build a GRE tunnel through the firewall and add the GRE network (on both routers) into EIGRP. Be careful not to redistribute the external routing protocol (if there is one) into EIGRP and vice-versa.

BGP is actually quite simple on a basic level. It get's tricky when you need to exchange routes between BGP and an IGP, in this case EIGRP.

However, it sounds like you don't have a router on the outside of the firewall. In this case you can set up policy-routing which will ping a network, if the ping fails, the policy-routing will kick in and change the route you need changed.

Check these links-

http://www.cisco.com/en/US/about/ac123/ac114/ac173/Q2-04/department_tech tips html

http://www.cisco.com/warp/public/784/packet/apr04/pdfs/dept_tt_scenarios .pdf

I use these features in my network. Specifically I ping a destination host that we're not exchanging routes with. When that ping test fails, policy-routing kicks in and the backup route is injected. Once the pings start working again, the original route is re-injected. Works quite well.

--Barn

On Wed, 5 Jan 2005 12:29:58 -0500, Kern, Tom <tke...@charmer.com> wrote:

connected via T1's. each site has its own internet connection(frame relay) and i'd like to set it up so if one site's firewall(sonicwall and watchguard) go down or the internet link goes down, internet traffic will automagically be rerouted via one of the other site's internet connection.

work. but if eigrp neighbors need to be on the same subnet, this won't help me. also eigrp would only work if the whole router went down(rare). i want the routes to change if the serial link is down.