[cisco-nas] Ascend Pipline 75 vs Cisco AS5200 MPP performance problem

[Ianik Lamontagne RSI Technologies]

Hi, 

	I am experiencing big problems connecting a Pipline 75 (Ascend)
with my Cisco AS5200 in multilink mode (128Kbps).  I am able to connect
in PPP mode (64 Kbps) or in MPP mode with only 1 ISDN channel (64 Kbps)
and do a data transfert with no problem.  

	The problem occurs when I try to connect with 2 channels in
order to get a 128Kbps transfert rate.  First, the connection is
successfull.  Then I am able to connect to my ftp server. But when I
start the 1 meg file transfert I can see the data transfert (DOS ftp
hash mode activated) and it suddenly stops.  The transfert rate then
falls to 0 Kbps and my ftp connection drops. 

If I use another Ascend product (Pipline 95) I am able to do the same
transfert with no problem at all.  If I use the exact same config and I
connect my pipline 75 to an Ascend MAX4048 it works great.  That is why
is think this is a problem between Pipline 75 and Cisco AS5200 because I
tested multiple P75 units and got the same problem with all of them.

AS5200 IOS: 11.3(11b)T3
P75 firmware : 7.3.1

I tried with different firmware and IOS with the same results.

Do you have any idea about the cause or a way to troubleshoot it  ?

Thank you in advance !

Ianik Lamontagne