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

[Aaron Leonard]

According to my notes, Ascend "MPP" mode is some nonstandard
Ascend proprietary thing which IOS doesn't support.

So use standard Multilink PPP (which Ascend evidently calls "MP")
and use BACP (BAP) to control the channels coming up, going down.

Here are some old notes:

  I finally got BACP up between the P-50 (5.1aP9) and an IOS (11.3)router.
   
  The things that were missing were:
   
  Ascend P-50.
   
    Must give it it's own MAC address as a name, so we can bundle
    things properly
   
    Set ENCAPS=MP  (Don't ask, some Ascend Proprietary thingy)
   
  YOu need to set BACP=YES in 2 spots.  One under the
    Ethernet -> Answer -> PPP options ->  BACP=YES
  And
    Ethernet -> Connections -> [router name] -> Encaps Options -> BACP=Yes
   
   
  On the IOS:
   
  ppp multilink bap
  ppp bap call accept
  ppp bap call timer 2
  ppp bap drop timer 2
    I had to set this, to stop the following type of LCP debugs to show up.
    Apparently we don't wait long enough by default...
   
  Vi1 BACP: O CONFREQ [REQsent] id 8 len 10
  Vi1 BACP:    FavoredPeer 0x65720125 (0x010665720125)
  Vi1 BACP: I TERMACK [REQsent] id 8 len 4
  Vi1 BACP: TIMEout: Time = 0x501DF8C State = REQsent
  Vi1 BACP: O CONFREQ [REQsent] id 9 len 10
  Vi1 BACP:    FavoredPeer 0x65720125 (0x010665720125)
  Vi1 BACP: I TERMACK [REQsent] id 9 len 4
  Vi1 BACP: TIMEout: Time = 0x501E7AC State = REQsent
  Vi1 BACP: O CONFREQ [REQsent] id 10 len 10
  Vi1 BACP:    FavoredPeer 0x65720125 (0x010665720125)
  Vi1 BACP: I TERMACK [REQsent] id 10 len 4
  Vi1 BACP: TIMEout: Time = 0x501EFCC State = REQsent
  Vi1 BACP: O CONFREQ [REQsent] id 11 len 10
  Vi1 BACP:    FavoredPeer 0x65720125 (0x010665720125)
  Vi1 BACP: I TERMACK [REQsent] id 11 len 4
  Vi1 BACP: TIMEout: Time = 0x501F7A8 State = REQsent
  Vi1 BACP: State is Listen
   
   
  ppp bap callback accept

---

> 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

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