BGP and EIGRP question

[Reignman]

Hello,

I have two Cisco 3640 running eBGP with 3 ISPs and iBGP with each other. So far so good. I've also got a Cisco 2620 that controlls a group of Class C's.
Till now I've been using statics, but there's the need for an iBGP protocol.
A friend of mine suggested EIGRP.
Unfortunately I cannot find anything matching my case in Cisco's site (perhaps I'm not using the correct keywords).
Can anyone help?

Thank you all in advance.

 

[routerman]

What do you want to do, are you planning to run an IGP bewteen al of your own routers?

If so you can run EIGRP with the following commands:

router eigrp 100
network 10.0.0.0
no auto-summary

This example covers the following points.

1 The number 100 (AS-number) has to be the same in all EIGRP routers.

2 The network addresses (Can use multiple numbers) are those applied to your existing interfaces on which you want to use EIGRP

3 EIGRP automatically summarises the IP address ranges (depends on IOS version), which can cause problems, turn this feature off to start with.

Hope this helps?

 

[Reignman]

routerman thank you very much for your response.
Let me give you a small diagram:

ISP 1 ISP2 ISP3
\ \ /
\eBGP \ /eBGP
\ iBGP |
3640--------3640
\ /
Statics\ /Statics
\/
2620

What I want is to to remove the statics pointing to the 2620 (which controls a few Class C's (PCs,Routers)).
A URL describeing the implementation would be most helpfull.
Thanks!

 

[gconnect]

eigrp is always a good choice because
A) it is very simple to setup
B)it is Cisco proprietary, therefore more secure (there is a lack of hacker tools that can infilitrate and understand it)

but as long as your network is properly secured running a IGP protocol like OSPF is still fine and has a tremendous wealth of case scenerios on cisco.com

as far as the eigrp implementation:
you will still probably need a couple static routes hanging around as i would not suggest synchronizing all the bgp-isp routes into your eigrp and ip routing tables (cpu and memory consumption).

once you answer these questions, i may be able to offer more help.

1 do you actually have 3 different ISPs or 2 (a multihomed ISP connection hanging off 1 3640 and another ISP hanging off the other 3640)?
2 on your 3640 with that has 2 ISP connections, are you using ip unnumbered?
3 is the other 3640 a backup internet link?
if so than this won't be to complicated.

4 are you using loopbacks for bgp?

most importantly
5 how are the routing choices for unknown/Internet traffic handled (policy routing/route-maps)?

 

[baddos]

I would run OSPF for compatability purposes. You might be running a firewall or some other router that doesn't support EIGRP down the road. OSPF has great flexibility and scalability, and can do pretty much most of what EIGRP can do.

EIGRP is Cisco only, and is a mix between OSPF and IGRP. It can do a lot of cool stuff that you'll probably never do, but that's the same for OSPF.

With three routers you could even run RIP version 2.

-Bad Dos

 

[Reignman]

Thank you all for your replies!
gconnect here are the answers to your questions:
1) Yes I have connections to three different ISPs.
2) Yes I am using ip unnumbered
3) No The situation is more or less like this... The 3640 with the single connection handles a group class C's as first choice and the other 3640 the remaining. With two of these ISPs we have a rather good connection (Mbps) and we've seperated them in the two 3640s. The connection to the third ISP is only for exchanging traffic inside my country.
4)Yes. Both major ISPs have Loopbacks
5)More or less everything that does not go with the rules set by our route maps follow a free choice.

baddos I agree with you, but we've only got Cisco equipment and so do all our customers. Besides that from the conversation I had with that friend I mentioned in my original post we thought that EIGRP would be a good choice mainly for futute expansion.

I hope I cleared things a little bit more.