Re: (ASCEND) TNT call failures

[Dana Hudes <dhudes@hq.smartworld.net>]

Generic advice:
LCP option negotiation? turn on debug for ppp on your pipleline 75.
go over parameters carefully. Magic #s is a potential gotcha as is MRU.
MRU is a nasty one that will have you tearing your hair out.
Note I said *MRU* not MTU (MTU  being an IP attribute derived from,
directly or indirectly depending on whether you override, MRU).
Also try straight PPP first. Watch out for BACP and bonding turned on for
one and not the other side.



On Mon, 27 Mar 2000, Jamie Hill wrote:

> We have been having trouble with all of our TNTs (3) where calls are
> failing on the PPP negotiation and more specifically LCP.  The problem
> seems to happen for both ISDN and analog calls.  We see disconnect codes
> of 185 or 41 and progress codes of 77 or 75.  On one of our TNTs we have
> CT1s and on the other 2 we have PRIs.  We have seen the problem on both
> 7.2.0 and 8.0.1 versions of TAOS.  So far Ascend/Lucent has been _NO_
> help.  We used our protocol analyzer to watch the calls and we saw no
> problems with the setup and tear down of the calls.  Our T1s on the TNTs
> have no errors on them at all.  The problem is easily demonstrated with
> ISDN due to the high numbers of calls that can be made in a short period.  
> We can reproduce the problem with several different isdn routers including
> p50s and we notice it on our analog pool with various modems as well.  
> When the connection fails with a p50 you can watch the CRC errors increase
> at a significant rate in the WAN Stat window (20-300)
> 
> Here are the numbers for a lightly loaded TNT (11 PRIs).
> Total calls: 19947
> Total failures: 1156
> 
> Syslog output
> -------------
> Mar 14 14:01:42 oc-nas-02.networkwcs.net 1/17: [1/2/27/5] Incoming Call,
> 8124262270 [MBID 604; 8124262270->8122531003] 
> Mar 14 14:01:42 oc-nas-02.networkwcs.net 1/17: [1/4/1/6] Assigned to port,
> 8124262270 [MBID 604; 8124262270->8122531003] 
> Mar 14 14:01:44 oc-nas-02.networkwcs.net 1/17: [1/2/27/5] Call Connected,
> 8124262270 [MBID 604; 8124262270->8122531003] 
> Mar 14 14:02:11 oc-nas-02.networkwcs.net 1/17: [1/2/27/5] Call
> Disconnected [MBID 604; 8124262270->8122531003] 
> Mar 14 14:02:11 oc-nas-02.networkwcs.net 1/17: [1/4/1/6] Call Terminated
> [MBID 604; 8124262270->8122531003] 
> Mar 14 14:02:11 oc-nas-02.networkwcs.net 1/4: [1/4/1/6]
> STOP: 'Answer'; cause 185.; progress 77.; host 0.0.0.0 [MBID
> 604; 8124262270->8122531003] [Answer] 
> 
> Any help would be appreciated.
> 
>    --Jamie Hill
> 
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