I have configured a IRB bridge over multilink on routers 2801 using a Multilink with two E1 links, I can do ping from each side to the other, but when I try to put traffic over 1458 bytes I get TIME OUT, same problem when I try to pass files usin FTP.
Cisco IOS Software, 2801 Software (C2801-ADVSECURITYK9-M), Version 12.4(1a), RELEASE SOFTWARE (fc2)
show bridge group
Port 3 (FastEthernet0/0) of bridge group 1 is forwarding
Port 10 (Multilink1) of bridge group 1 is forwarding
Packets too large for translational bridging: 0 input, 9635 output
show ppp multilink
Multilink1, bundle name is rt-satplc03
Endpoint discriminator is rt-satplc03
Bundle up for 00:03:55, 1/255 load
Receive buffer limit 24000 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
0 lost fragments, 1142 reordered
0/0 discarded fragments/bytes, 0 lost received
0x35E5 received sequence, 0xAF sent sequence
Member links: 2 active, 0 inactive (max not set, min not set)
Se0/3/1:1, since 00:03:55
Se0/3/0:1, since 00:03:54
No inactive multilink interfaces
See the attach config files for each router.
Let me know if you need any other information,
Hope you can help.