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Re: (ASCEND) MAX 1800 bri prob

> We experienced massive problems losing BRIs.
> 
> On a DMS-100 switch in NI-1 mode, our BRIs would sometimes go into the "M"
> state instead of "D", where only one of the two channels works. It also
> messes up the hunt group. Physically unplugging and replugging the line
> may of may not help.

Ahh, I've seen this problem, too. I never knew what it was, but I'd power
cycled the box a lot.

Our BRIs are NI-1 also, but we're connected to a 5ESS switch.

> We hypothesize that it helps a lot to have all your lines plugged into the
> same line card. Thing is, the telco usually tries to do the opposite (plug
> no two of your lines into the same line card) in order to minimize damage
> in case of line card failure.

We've added our BRIs one at a time so I really doubt that any of them are
anywhere near the others.

> One MAX 1800 in one of our POPs has been very lucky. It runs 5.0A. All lines
> are up "D" and we're never, ever touching it again because it's been working
> perfectly for 150 days straight (yes, it's our piece of quipment with the
> highest uptime). But we couldn't keep the same MAX up for a day and a half
> in its previous location in another city.

I guess that you've not seen the performance problems that we have. It was a
horrible problem to ping the M1800 and get 100% response but pinging a remote
P75 would get only 65% of the packets back. As you can imagine, telnet
sessions were quite painful and FTPing files was almost impossible.

Ascend asked us for a packet trace of our Ethernet so they'd get an idea of
what's going around on the M1800's Ethernet. I sent that to them, but the
Ascend techs haven't yet come up with any explanation about why the M1800
performs so poorly.

One thing that may be helping create the problem is that we do bridging
entirely... no routing. (Can't route many of the non-IP packets on our
network.) I assume that others using M1800's are using them for IP routing.

--Marc

Marc Shannon                                  +1 626 919 3600
Innosoft International, Inc.             FAX: +1 626 919 3614


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