2x 2Mpbs WAN link how to route??

[Chilleh]

Hi this one has really got me stuck so I hope someone can point me in the right direction.

Had a 2Mbps WAN link between two sites' networks using WIC-1T in 2600 chassis as both ends. All worked fine.

Now we added another 2Mbps link and another WIC-1T in each router. Both lines are up and running and I can ping all interfaces etc.

The problem is that I can still only get a maximum bw of 2Mbps in either direction when I expect closer to 4mbps if I'm the only one sending traffic. The old set-up seemed to auto-negotiate bw between A & B ends, so if site A did nothing across the link then Site B would get more than 50% of the bw.

I'm using IGRP and both routers see *both* WAN routes to each other. Traffic *is* going down both WAN links but only up to 2mbps in total each way. here's the IP route

C 192.168.20.0/24 is directly connected, Serial0/1
S 192.168.0.0/24 [1/0] via 192.168.1.254
C 192.168.1.0/24 is directly connected, Ethernet0/0
C 192.168.2.0/24 is directly connected, Serial0/0
I 192.168.3.0/24 [100/8576] via 192.168.2.1, 00:00:07, Serial0/0
[100/8576] via 192.168.20.1, 00:00:07, Serial0/1
S* 0.0.0.0/0 [1/0] via 192.168.1.254


Is there a way to 'aggregate' or 'channel bond' the two links with this set-up? I've been advised to use EIGRP instead but can find no documentation to prove this would work where IGRP doesn't.

Any help greatly apreaciated.

thanks

 

[BOJIKA]

you may use ppp multilink

http://cisco.far.ru/multilink.php

or

!
interface Serial0/0
no ip route-cache
!
interface Serial0/1
no ip route-cache
!
ip route 0.0.0.0 0.0.0.0 Serial0/0
ip route 0.0.0.0 0.0.0.0 Serial0/1
!

per-packet load-balancing