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Cisco EIGRP Configuration

Hi,
Our school has two locations that are currently linked via a full T1 (PTP) connection. We are planning to have a second but primary PTP connection based on Optical Laser or FSO technology. The link operates at 100Mbps in Full Duplex mode. My current routing protocol is RIP and am planning to switch to EIGRP as it has better routing mechanisms in-built. I'm planning my configuring something like this and would like to have comments, suggestions or pointers to how to go about using FSO as primary and T1 as backup link.

Config:
Location A (main building and common internet gateway for both locations):
Ethernet  0/0
description "To Firewall (Internet Gateway)"
Ip address 192.168.1.1 255.255.255.0

Ethernet 0/1
description "Location A LAN"
Ip address 192.168.2.1 255.255.255.0

Ethernet 0/2
description "New PTP primary Link - Location A < > B"
Ip address 192.168.4.1 255.255.255.0

Serial 0/0
Description "T1 Backup Link Location A < > B"
Ip address 192.168.5.1 255.255.255.0

Router eigrp 100
Network 192.168.0.0

Location B:
Ethernet 0/0
description "Location B LAN"
Ip address 192.168.3.1 255.255.255.0

Ethernet 0/1
description "PTP primary Link - Location A < > B"
Ip address 192.168.4.1 255.255.255.0

Serial 0/0
Description "T1 link - PTP Link - Location A < > B"
Ip address 192.168.5.1 255.255.255.0

Router eigrp 200
Network 192.168.0.0

Thanks, Sharad
0
raisharad
Asked:
raisharad
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2 Solutions
 
that1guy15Commented:
If you want EIGRP to send all traffic over the new fiber link over the PTP link then set the bandwidth command on each interface.

int s0/2 (Fiber link)
bandwidth 100

int s0/1 (PTP link)
bandwidth 1544

The bandwidth command does not effect speed in any way just how EIGRP determines the best path. EIGRP will then fail over to the PTP link when the fiber link goes down.



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raisharadAuthor Commented:
the new fiber link (actually an optical laser) is on E0/2. will it make any difference?
is the configuration posted originally along with bandwidth commands enough to get EIGRP going? I'm new to EIGRP.
Thanks,
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TakedaTCommented:
Your autonomous system numbers need to match on both routers.  You have it as 100 on one and 200 on the other.  

Also, I think you should also use the mask when you specify the network for eigrp, since it is a class C network address, I think it will default to only sendint routing updates for the 192.168.0.0 255.255.255.0 network.  You should specify the 255.255.0.0 mask to cover all your networks.

Also, its probably just a quick draw up, but you have the same addresses assigned on both routers.  One of them needs to be changed.
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that1guy15Commented:
Sorry typo on the bandwidth command

On the fiber interface you will use:

bandwidth 100000 (not 100) <---set in Kbps

Yes you will need to make sure to place the correct bandwidth command on the correct interface. You will also need to set up eigrp on the neighbor routers as well (make sure to use the same AS ). Also i recommend using the "no auto" command under eigrp to disable auto-summarization.

eigrp 200
no auto
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TakedaTCommented:
I think I need to correct myself when I said the network command. I think it should read as follows with the wildcard mask.

network 192.168.0.0 0.0.255.255
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raisharadAuthor Commented:
These two routers are not in the same location. One is in location A and another in B connected via a T1. Do I still have to given them same AS #? Aren't they both neighbors to one another?
And also, does EIGRP require any static or default route commands like RIP?
Thanks for any clarifications. EIGRP seems much different than RIP.
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TakedaTCommented:
Only configs with the same AS # will exchange routing info with eachother.  Its not like OSPF where the number is just a process id.  EIGRP doesnt use the term neighbors like the way OSPF does.  If you want to have EIGRP to distribute a default route, you can use the default-network config command instead of using static routes on all ur routers.  You would most likely use it where you are doing your NAT for public access.

In the end, EIGRP is really the easiest routing protocol to configure.  Just enable it for all of your networks with the proper bandwidth commands and turn off autosummary as that1guy15 said and it pretty much handles everything in itself.
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raisharadAuthor Commented:
Thank you so much for helping me with my situation and also clarifying my concepts about EIGRP!!!
I think I can take it from here. Seems pretty straight forward so far.
I will distribute the points in between two of you.
You guys ROCK!!!
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