Thanks for your help and I have attached the output of the show interfaces command on both interfaces.

Here you go...

Voce_BSI02#show int S0/2/0

Serial0/2/0 is up, line protocol is up

Hardware is GT96K with integrated T1 CSU/DSU

Description: 360 Order# 601738

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, LCP Open, multilink Open

Link is a member of Multilink bundle Multilink1, loopback not set

Keepalive set (10 sec)

Restart-Delay is 0 secs

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters 3d22h

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 20

Queueing strategy: fifo

Output queue: 0/40 (size/max)

30 second input rate 4000 bits/sec, 9 packets/sec

30 second output rate 3000 bits/sec, 8 packets/sec

4617298 packets input, 1478569214 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

2 input errors, 2 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

4577519 packets output, 1094659099 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 output buffer failures, 0 output buffers swapped out

5 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

Voce_BSI02#show int S0/3/0

Serial0/3/0 is up, line protocol is up

Hardware is GT96K with integrated T1 CSU/DSU

Description: 360 Order# 601739

MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, LCP Open, multilink Open

Link is a member of Multilink bundle Multilink1, loopback not set

Keepalive set (10 sec)

Restart-Delay is 0 secs

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters 3d22h

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 20

Queueing strategy: fifo

Output queue: 0/40 (size/max)

30 second input rate 4000 bits/sec, 10 packets/sec

30 second output rate 5000 bits/sec, 10 packets/sec

4610939 packets input, 1471322904 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

4574250 packets output, 1094684298 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 output buffer failures, 0 output buffers swapped out

5 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

Voce_BSI02#

Joseph

Does the load-sharing command on the serial interfaces has any effect on multilink interfaces? . I had always thought multilink has its own algorithm to distribute packets across links

Johny

You might try disabling multilink fragmentation

ppp multilink fragment disable

Narayan

Narayan,

"Does the load-sharing command on the serial interfaces has any effect on multilink interfaces?"

I wouldn't think so, but it's unusual. That, and along with documentation that mentions the need for FQ for some multilink operations, is why I suggested it's removal.

"You might try disabling multilink fragmentation "

Good suggestion! Something that I had thought to suggest and then promptly forgot to add to my post. In theory (I believe), it would offer slight less throughput to any one flow, but if a flow's packets are alternated between links, should make little net difference to throughput although should reduce performance impact of the fragmentation on both ends of the multilink.

Thanks for your suggestions, I will try those commands the next time I am on site since I locked myself out of the router once when I entered in the ppp multilink interleave command. Have you or anyone else had these strange symptoms when working with multilink interfaces? Thanks again for your help.