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EIGRP Routing Issue?

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kythri

Technical User
Jan 21, 2003
116
US
Greetings!

Forgive me if I don't initially provide enough information - if you all are willing to work with me, I'll provide all that I can.

I'm experiencing an odd issue with some routing.

We have a 100mb WAN link between Site A and Site B.
A machine is trying to reach Site D, which has a 10mb WAN link to Site B, and a 1.5mb backup link to Site B.

Site D talks to Site B via the 10mb link.
Site B talks to Site A via the 100mb link.

When the machine at Site A attempts to talk to Site D, it routes to Site C via a 100mb link, then from C to B via a 45mb link, and finally from B to D via the 1.5mb link.

EIGRP is up, and shows the following topology at Site A:

SSNLIS031#show ip eigrp top 192.168.211.0
IP-EIGRP (AS 101): Topology entry for 192.168.211.0/24
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2695936
Routing Descriptor Blocks:
192.168.201.131 (GigabitEthernet0/11), from 192.168.201.131, Send flag is 0x0
Composite metric is (2695936/2693376), Route is Internal
Vector metric:
Minimum bandwidth is 1536 Kbit
Total delay is 40210 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 4
192.168.201.129 (GigabitEthernet0/11), from 192.168.201.129, Send flag is 0x0
Composite metric is (38400/12800), Route is External
Vector metric:
Minimum bandwidth is 100000 Kbit
Total delay is 500 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
External data:
Originating router is 192.168.201.129
AS number of route is 0
External protocol is Static, external metric is 0
Administrator tag is 0 (0x00000000)

192.168.201.129 is the route it SHOULD be taking, but it's taking the route 192.168.201.131.

Based on the metrics, 192.168.201.129 looks to be the better of the two, right?

Again, apologies if I haven't provided enough information, or explained everything clearly - I'm a bit new at this game.

Any help that can be provided would be much appreciated.
 
The 192.168.201.131 route is an internal route and thus is the preferred route.
 
OK...

How do I influence it to choose the external route, then?

Other routers on the network have preferred routes that are external...

I've been looking to see if there's something that influences a particular route over another in our configs, and can't find it.
 
In your explanation you don't mention how C is connected to A. Perhaps a network topology diagram is in order.

Post the configuration of SSNLIS031
 
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