ADSL -PANNE DIE ZWEITE
Nach dem stundenlangen ADSL-Ausfall von letzter Woche blieben diesen Freitagmorgen zahlreiche ADSL-Kunden erneut vom Internet ausgesperrt.

http://www.pctipp.ch/library/actions/go.asp?id=30159

cheers
andre

-----Original Message-----
From: swinog-bounces@lists.swinog.ch
[mailto:swinog-bounces@lists.swinog.ch]On Behalf Of Andre Oppermann
Sent: Freitag, 15. April 2005 14:27
To: swinog@swinog.ch
Subject: Re: [swinog] swisscom down ,-)

Erich Hohermuth wrote:
>
> Hello
>
> > the facts:
> > - about 50% of the adsl network went down, the rest was online without
> > problems since weeks
> > - layer1 link was down (from CPE side)
>
> If we have a short look on the Protocol Stack for BBCS ( Swinog #3 Page 14
> [1] ) only the DSLAM could have this type of error. Because it is a link
> failure between the CPE and the DSLAM.

Indeed.

> The next tool which could have an impact on all DSLAM's in about 2 hours ( not
> every layer1 was down on the same time) is either the monitoring tool or the
> configuration deployment tool.

Very likely. Or the new deployment tool triggered a bug in the Alcated DSLAMs.

> As a side note: We still do not have access to the DSLAM Monitoring Tool which
> is a requirement to make firstlevel support !
>
> At the moment we still have customers complaining.
>
> Theorie1:
> Someone wrote a "new" deployment script for the new BBCS release which
> includes ***classified ***.

I guess dynamic switching of DSL line speeds is not the best idea...
One problem more to solve before all three things will play together.

> Unfortunatly all DSLAM's were affected by this change.

Guess what happens when the MPLS core breaks down. All the new stuff runs
over the same core network (IPSS, BBCS and new CES). What will happen when
the next SQL-Slammer strikes and blasts millions of packets into all these
networks? Or there is a bug with MPLS or label distribution...

Too many eggs in one baset if you ask me. At least the phone network will
continue to work because at the moment it is based on TDM and SDH circuits.
But for how long?

--
Andre
_______________________________________________
swinog mailing list
swinog@lists.swinog.ch
http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog