EIGRP Configuration Advice Please

Curiosityx · 23 May 2007 at 00:45

Greetings, im in the process of configuring several client sites to use EIGRP now that we have moved there current infrastructure over to purely Cisco.

Could you advise me whether the diagram below would be the best course of action, I have stripped it down somewhat and simplified the addressing but it gives the basic outline.

Now what im thinking it to just advertise the 10.140.0.0 and 192.168.0.0 networks from the main site using auto-summary, then too advertise the 192.168.100.0/110.0 and 120.0 from the remote sites.

Would this work or should i configure both the 10.140.0.0 and 192.168.0.0 networks on every router within the same AS?

Any comments would be appreciated.

Cheers

rick827 · 23 May 2007 at 16:04

I hope there's an awful lot of redundant links missing off the diagram as eigrp is a pretty heavy weight dynamic routing protocol for something so simple

However you with eigrp you want 1 AS with all routers in the AS advertising their directly connected networks, so your head office router would only advertise the 10.x.x.x network as eigrp dynamically tells it how best to access a 192.168.x.x network. Then each site router would advertise their locally attached subnets

oddjob62 · 23 May 2007 at 18:41

rick827 said:
so your head office router would only advertise the 10.x.x.x network as eigrp dynamically tells it how best to access a 192.168.x.x network. Then each site router would advertise their locally attached subnets

I think the head office's subnet is missing from the diagram, unless the head office has no internal network that needs to be routed, and is just connecting the other 3 (in which case rick827 is correct)

Curiosityx · 23 May 2007 at 18:46

Cheers, yes it is a very simple example, but you have given me what i needed to know.

NiCkNaMe · 23 May 2007 at 21:35

Exactly how much subnets? Seems a waste to be using a routing protocol if a few (floating)static routes would suffice?

Curiosityx · 25 May 2007 at 01:03

NiCkNaMe said:
Exactly how much subnets? Seems a waste to be using a routing protocol if a few (floating)static routes would suffice?

There will be 58 sites in total, some will also be linked to sites within the same geographic area, im trying not to run all the routing through the central office, have some redundancy, id also like to dynamically select the best link between sites and have very fast convergence should a link go down, EIGRP imo is the way to go.

NiCkNaMe · 25 May 2007 at 08:50

Curiosityx said:
There will be 58 sites in total, some will also be linked to sites within the same geographic area, im trying not to run all the routing through the central office, have some redundancy, id also like to dynamically select the best link between sites and have very fast convergence should a link go down, EIGRP imo is the way to go.

Completly agree then in that case.

EIGRP is a great routing protocol, just a shame it's Cisco proprietary.

Syngress · 25 May 2007 at 18:27

If your building tunnels between the spoke and hub site and then advertising the routes over this tunnel using EIGRP, make sure you dont advertise the tunnel end point addresses, as you will end up with bouncing routes as the routers will learn the tunnel end points via EIGRP and then try and rebuild the tunnel over that route, which obviously will take the tunnel down, the tunnel then rebuilds itself the routes are advertised a you end up in a circle of bouncing routes and tunnels.

Hope the above makes sense to you.....and in actual fact I have no idea if thats the case with EIGRP I know it is with OSPF though

Syngress

Syngress · 25 May 2007 at 18:29

Another point for redundancy....(I know you said you havent put all the links in *** above diagram, so you may have thought of this already) you could build some backup tunnels between the client sites so that if the main link to the hub site goes away traffic could be routed to the hub via another client site.

Syngress

NinjaBill · 25 May 2007 at 18:42

How is EIGRP heavyweight? You just turn it on and it works 99% of the time. No config at all, unless you want to start filtering routing updates, or changing link priority

Router Eigrp 1
no auto-summary
Network 10.0.0.0 0.255.255.255
Network 192.168.0.0 0.0.255.255

on each of the routers, and a redistrubute static at the core, where your default route lives, and you are sorted

Syngress · 26 May 2007 at 11:00

NinjaBill said:
How is EIGRP heavyweight? You just turn it on and it works 99% of the time. No config at all, unless you want to start filtering routing updates, or changing link priority

Router Eigrp 1
no auto-summary
Network 10.0.0.0 0.255.255.255
Network 192.168.0.0 0.0.255.255

on each of the routers, and a redistrubute static at the core, where your default route lives, and you are sorted

As I mentioned above I wouldn't advertise the 10.0.0.0 network via EIGRP......

Syngress