[24765] in North American Network Operators' Group
Re: What frame relay switch is causing MCI/Worldcom such grief?
daemon@ATHENA.MIT.EDU (Prabhu Kavi)
Mon Aug 9 10:52:52 1999
Date: Mon, 09 Aug 1999 10:52:59 -0400
From: Prabhu Kavi <prabhu_kavi@tenornetworks.com>
To: "Shawn \\" "CJ " " Washington" <CJ@bbn.com>, nanog@merit.edu
Errors-To: owner-nanog-outgoing@merit.edu
I can probably shed some light on this...
Disclaimer: I used to work for Cascade/Ascend/Lucent. I am only
repeating information that has been made publicly available by John
at the first MPLS conference (the presentations are/were? available
on UUNET's web site).
Cascade runs a version of OSPF that was extended to allow
constraint-based routing. These extensions are similar to what
has recently been presented in the IS-IS and OSPF working groups during
the last year or so.
On top of OSPF, there is a protocol which is responsible for actually
setting up the connections according to specific constraints (e.g.
bandwidth, QoS level). Again, this is similar to the work
now being done in working groups responsible for CR-LDP and RSVP.
Cascade released its version in 1993, and has been refining it
ever since.
Prabhu
Shawn \"CJ\" Washington wrote:
>
> Doe's anyone have an idea as to what Link State Algorithm the Cascade/Ascend
> 9000's switches run? I have been given conflicting reports that it is OSPF,
> or others say that it is OSPF "like" since John Moy worked for Cascade, he
> developed a version of OSPF for the Cascade/Ascend switches. Doe's anyone
> have more info on this? Also, if so, what version is supported on the
> Amethyst, Jade v.1, v.2. releases. Apparently, this may have something to do
> with all the instability issues with WCOM.
>
> CJ
>
> Michael Dillon wrote:
>
> > On Mon, 9 Aug 1999, Michael P. Lucking wrote:
> >
> > > On Mon, 9 Aug 1999, Michael Dillon wrote:
> > >
> > > > Is this another vendor related problem? If not, does it affect NNI
> > > > customers of Worldcom?
> > >
> > > Yes. We have one PVC using NNI via MCI/Worldcom (got it from LDDS years
> > > ago). It has been bouncing up and down for the past four days.
> >
> > Actually, what I meant was whether this so-called packet storm has
> > extended to frame relay networks with NNI to Worldcom. The PVC will bounce
> > if Worldcom cannot maintain the PVC portion within their network or cannot
> > pass traffic through their network. But the public description so far
> > seems to imply that the problem propogates from one switch to another.
> > Assuming this is actually what is happening, I wondered whether the
> > problem was propogating into any other networks via NNI connections.
> >
> > And if the answer is yes, then what vendor made the switches, etc. etc...?
> >
> > --
> > Michael Dillon - E-mail: michael@memra.com
> > Check the website for my Internet World articles - http://www.memra.com
>
> --
> -------------------------------
> Shawn "CJ" Washington
> Senior Network Engineer
> CCIE # 4683
> GTE Internetworking
> http://www.gte.com
> (410) 309-8349
> cj@bbn.com
> -------------------------------
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Prabhu Kavi Phone: 978-264-4900 x125
Director, Prod. Mgmt. FAX: 978-264-0671
Tenor Networks Email: prabhu_kavi@tenornetworks.com
50 Nagog Park WWW: www.tenornetworks.com
Acton, MA 01720
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