Niraj, we recently noticed a problem on one of our overseas ISDN PRI not
very similar to yours, but we were using external TA with Bonding-1.
Anyway, the problem is that AT&T was connecting each B channel through
different paths on their network. That was causing each B channel having a
different delay. On Bonding-1, there is a maximum difference of time
acceptable for receiving the packets from different B channels (I think it's
40ms). I never had to look for the Multilink PPP specifications, but I
really suspect that there are similar rules.
My suggestion for you in order to verify if this is the problem is to start
doing calls using one single B channel (just remove the MPPP config from the
interface). If it works fine (try to call several times), add MPPP back and
do a debug ppp multilink and send the output to the list. That will probably
give some clue of what is going on.
Also, another problem that I had on the past (on an overseas ISDN BRI backup
connection) was that it would work only if I configure the data channel to
56K. With 64K, it would drop the call as soon as I start sending some
traffic (maybe I should mentione that I was using an Adtran ISU128 TA). My
conclusion was that there was a switch on the path that was unable to handle
64K channels.
Good luck.
-----Original Message-----
From: Niraj Palikhey [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, October 03, 2000 12:56 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: Intermittent ISDN connections
Yes, the access list specifies ip any any
dialer idle-timeout is set to 360 on both routers.
When we do an extended ping and tell it to ping 2000 times, it pings
initially, then stops and then pings once again. During the stop period, we
cannot type any commands on the router. It just freezes. Then once ping
works again, we are able to work on the router
>From: "Ejay Hire" <[EMAIL PROTECTED]>
>Reply-To: "Ejay Hire" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>CC: [EMAIL PROTECTED]
>Subject: Re: Intermittent ISDN connections
>Date: Mon, 02 Oct 2000 16:23:10 CDT
>
>Are your pings interesting? What is your Idle-timeout?
>
>
>----Original Message Follows----
>From: "Niraj Palikhey" <[EMAIL PROTECTED]>
>Reply-To: "Niraj Palikhey" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Intermittent ISDN connections
>Date: Mon, 02 Oct 2000 12:49:21 EDT
>
>Hi,
>Need help in trying to trouble-shoot an isdn pri E1 connection problem b/w
>2
>3640 routers using DDR b/w our two sites, one in Paris and one in Morocco.
>The call connection drops after about a minute. I can do an extended ping
>to
>the Morocco router from Paris. It works initially, but the link drops after
>a couple of pings.
>Does the dialer hold-queue have to be the same values on both routers to
>keep the link up? I have 2 different values now, one at 75 and the other at
>100.
>I also have the dialer load-threshold 10 either command both routers.
>Should
>this values be higher?
>Also the hold-queue for the s0/0:15 interface is set for 75 on one router
>and 150 in and 150 out on the other router. Should both these values be the
>same?
>Is there any special tweaking that needs to be done because these channels
>are used for voice traffic?
>
>Any help is gratefully appreciated.
>Thank you.
>Kind regards,
>Niraj
>
>
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