Re: Multipath Routing - EIGRP

sstringham · ‎06-22-2006

I have a routing question.

Previous configuration:

3620 with 2 T1 lines to a 3640 (in the central office). I would do a show ip route and both lines would show up for the subnet in either router.

New configuration:

3620 with 3 t1 cards. (two are the same - 1 new). But, the new one is going to a 2821 at another location. Between that 2821 and the 3640 is a 6506 (sup 720) and a 4506 (sup iv). The 3640 sees all three routes. The 6506 (directly connected to the 2821) sees only the route through the 2821, and the 4506 only sees the one through the 3640. The 2821 only lists the one through it's t1 to the 3620. All routing is EIGRP.

Any ideas on where to look?

Roberto Salazar · ‎06-22-2006

It's pretty hard to follow, let's start with maybe you can provide a simple ascii topology drawing and the show ip route for all the routers involved.

kamlesh.sharma · ‎06-22-2006

you need to look at 4506 and 6509 switch wherther EIGRP routing is available there or not.and what is the connectivity between 3640---4506----6509----2811 devices as bosalaza suggested show output will definitly be a good way of troubleshooting and finding the problem.

sstringham · ‎06-23-2006

Ok.

We have a 3620 in a remote office. This has two T1 connections to the 3640 in the main office. Also one T1 to the 2821.

We have in the main office a 3640 with two T1 connections to the 3620. It also is connected to the 4506 via a 100mb enet.

The 4506 is connected to the 6506 via a 100mb trunk.

The 6506 is at a new offsite data center with the 2821.

The 2821 is connected to the 6506 with GigE, and to the 3620 via T1.

3620 ----- Local network

T1 / / \

/ / T1 \ T1 (New)

/ / \

3640 - 4560 - 6506 - 2821

100 100T Gig

3620 Example

interface Serial1/0

ip address 172.16.99.202 255.255.255.252

ip load-sharing per-packet

ip route-cache flow

The 4506 and 6506 IPs are bound to the VLAN.

interface Serial0/1/0

ip address 172.16.99.221 255.255.255.252

ip load-sharing per-packet

ip route-cache flow

no ip mroute-cache

This is on all devices

router eigrp 44050

variance 2

redistribute static

network 172.16.0.0

no auto-summary

no eigrp log-neighbor-changes

sstringham · ‎06-23-2006

3620 Routing Table (truncated)

C 172.16.97.0/24 is directly connected, Ethernet1/0 ---- Local Subnet

D 172.16.100.0/23 [90/3181312] via 172.16.99.201, 15:55:39, Serial1/0

[90/3181312] via 172.16.99.205, 15:55:39, Serial1/1

[90/2170368] via 172.16.99.221, 15:55:39, Serial0/0 --- NEW

D 172.16.104.0/24 [90/3181568] via 172.16.99.201, 16:05:05, Serial1/0

[90/3181568] via 172.16.99.205, 16:05:05, Serial1/1

[90/2170368] via 172.16.99.221, 16:05:06, Serial0/0

C 172.16.99.200/30 is directly connected, Serial1/0

C 172.16.99.204/30 is directly connected, Serial1/1

C 172.16.99.220/30 is directly connected, Serial0/0

2821 Routing Table (truncated)

D 172.16.97.0/24 [90/2195456] via 172.16.99.222, 15:56:09, Serial0/1/0 --- New

D 172.16.99.0/27 [90/3328] via 172.16.99.237, 15:56:09, GigabitEthernet0/0

D 172.16.100.0/23

[90/3072] via 172.16.99.237, 15:56:09, GigabitEthernet0/0

D 172.16.99.200/30

[90/3179264] via 172.16.99.237, 16:05:40, GigabitEthernet0/0

[90/3690496] via 172.16.99.222, 16:05:40, Serial0/1/0

C 172.16.99.220/30 is directly connected, Serial0/1/0

C 172.16.99.236/30 is directly connected, GigabitEthernet0/0

3640 Routing Table (truncated)

D 172.16.97.0/24 [90/3204096] via 172.16.99.206, 15:57:15, Serial1/1

[90/3204096] via 172.16.99.202, 15:57:15, Serial1/0

[90/2198528] via 172.16.99.233, 15:57:15, FastEthernet0/0 --- New

D 172.16.99.0/27 [90/28416] via 172.16.99.233, 15:57:15, FastEthernet0/0

D 172.16.100.0/23 [90/28416] via 172.16.99.233, 15:57:15, FastEthernet0/0

C 172.16.99.200/30 is directly connected, Serial1/0

C 172.16.99.204/30 is directly connected, Serial1/1

C 172.16.99.232/30 is directly connected, FastEthernet0/0

D 172.16.104.0/24 [90/28672] via 172.16.99.233, 16:17:19, FastEthernet0/0

4506 Table (truncated)

D 172.16.97.0/24 [90/2195968] via 172.16.100.3, 15:58:41, Vlan1 --- Target Subnet

C 172.16.100.0/23 is directly connected, Vlan1

D 172.16.104.0/24 [90/3072] via 172.16.100.3, 1w0d, Vlan1

C 172.16.99.232/30 is directly connected, Vlan16

D 172.16.99.236/30 [90/3072] via 172.16.100.3, 1w0d, Vlan1

D 172.16.99.220/30 [90/2170368] via 172.16.100.3, 15:58:42, Vlan1 --- New

D 172.16.99.200/30 [90/3178752] via 172.16.99.234, 3d11h, Vlan16

C 172.16.100.0/23 is directly connected, Vlan1

C 172.16.99.232/30 is directly connected, Vlan16

6506 Table (truncated)

D 172.16.97.0/24 [90/2195712] via 172.16.99.238, 16:00:18, Vlan18 --- Target Subnet

D 172.16.99.0/27 [90/3072] via 172.16.100.1, 1w0d, Vlan1

C 172.16.100.0/23 is directly connected, Vlan1

C 172.16.104.0/24 is directly connected, Vlan30

D 172.16.99.232/30 [90/3072] via 172.16.100.1, 1w0d, Vlan1

C 172.16.99.236/30 is directly connected, Vlan18

D 172.16.99.220/30 [90/2170112] via 172.16.99.238, 16:00:22, Vlan18

D 172.16.99.200/30 [90/3179008] via 172.16.100.1, 3d11h, Vlan1

D 172.16.99.204/30 [90/3179008] via 172.16.100.1, 3d11h, Vlan1

C 172.16.100.0/23 is directly connected, Vlan1

C 172.16.104.0/24 is directly connected, Vlan30

C 172.16.99.236/30 is directly connected, Vlan18

sstringham · ‎06-23-2006

Anything else to help?

Roberto Salazar · ‎06-23-2006

Maybe, show ip eigrp topo from both the 4506 and 6506.