The MPLS-OPS Archive

[Saeed Akhter <sakhter@hyperchip.com>]

Title: RE: Help with acronyms?

CSC is Connectivity Specification Chain, RFC 1992.In this mode of forwarding packets carry a list of connectivity specifications.

Saeed Akhter

-----Original Message-----
From: Saqib Jang [mailto:saqibj@margallacomm.com]
Sent: Thursday, January 31, 2002 2:14 PM
To: mpls-ops@mplsrc.com
Subject: Help with acronyms?

What is "FRR", "Inter-AS" and "CSC".

thanks,
Saqib

-----Original Message-----
From: Robert Raszuk [mailto:raszuk@cisco.com]
Sent: Thursday, January 17, 2002 1:58 AM
To: Nanda
Cc: Krishna Kishore Y; mpls-ops@mplsrc.com
Subject: Re: MPLS label switching vs IP routing

Nanda,

> So in your opinion what is the driving point for MPLS ?

Application one can build on top of it. The key applications being
deployed today are:

L3 MPLS-VPNs (inf. RFC2547),
CSC,
Inter-AS,
TE,
FRR,
DS-TE,
L2 Transport,
L2VPNs ...
+
and soon GMPLS.

Of course you may find ways to provide the the same results of some of
the above applications without MPLS at all, but still production
deployments and scalability characteristics still make the MPLS versions
of those much more attractive.

R.

> Nanda wrote:
>
> Hi Robert,
>
> So in your opinion what is the driving point for MPLS ? And in which case
we
> decide that MPLS should be deployed. Anyway i agree with Krishna's point
> that it makes routing efficient (for cases next route is same) eventhough
> finally the end result is same. What about IP checksum modification
because
> of the TTL decrements in each hop ?
>
> Regards,
> Nandan
> ----- Original Message -----
> From: "Robert Raszuk" <raszuk@cisco.com>
> To: "Krishna Kishore Y" <kishore@wipro.net>
> Cc: "Nanda" <nanda@procsys.com>; <mpls-ops@mplsrc.com>
> Sent: Wednesday, January 16, 2002 9:08 PM
> Subject: Re: MPLS label switching vs IP routing
>
> > Krishna,
> >
> > > If I understand correctly, it might not make routing faster but
> definitely
> > > efficient, in terms of reduced route lookup time.
> >
> > You are putting the question a bit upside down ... if one can already do
> > line rate lookup in hardware accelarated path for ip addresses it just
> > doesn't give you much advantage if you make the lookup faster with mpls
> > :-).
> >
> > R.
> >
> > PS. A few years back when the mpls started to roll out we measured and
> > the gain was something about 5% (label swap) for our platforms in the
> > LSRs and loss about 15% at LERs (label imposition) in compared to plain
> > CEF switching.
> >
> >
> > > Krishna Kishore Y wrote:
> > >
> > > But Robert,
> > >
> > > If I understand correctly, it might not make routing faster but
> definitely
> > > efficient, in terms of reduced route lookup time.
> > > If one has large number of routes in the forwarding table and next hop
> for
> > > all of them is same, I understand that one single label replaces this
> entire
> > > table. So reduction in routing/forwarding table entries.
> > > I think it's a step ahead of CEF (which is better than fast
switching).
> > >
> > > Please correct me if I am wrong.
> > >
> > > Kishor
> > >
> > > -----Original Message-----
> > > From: Robert Raszuk [mailto:raszuk@cisco.com]
> > > Sent: Wednesday, January 16, 2002 3:58 PM
> > > To: Nanda
> > > Cc: mpls-ops@mplsrc.com
> > > Subject: Re: MPLS label switching vs IP routing
> > >
> > > Nanad,
> > >
> > > > Now since the IP routing can be done at wire speeds for using the
> > > > latest Network Processors - does the label based switching in MPLS
has
> > > > any advantage in terms of speed compared to the IP routing
> > >
> > > No it never did.
> > >
> > > > generally in the white papers i was reading they always project that
> > > > Label based switching makes the IP routing faster - but this is no
> > > > longer true.
> > >
> > > That is just marketing :).
> > >
> > > R.
> > >
> > > PS. The same misconception is often heard as: "MPLS gives you QoS" -
> > > nothing more mistaken - if you don't have IP QoS MPLS will not help
you
> > > in making your netowrk QoS enabled It can enhance the existing QoS
> > > feature set but not replace it.
> > >
> > > > Nanda wrote:
> > > >
> > > > Hi,
> > > >
> > > > Now since the IP routing can be done at wire speeds for using the
> > > > latest Network Processors - does the label based switching in MPLS
has
> > > > any advantage in terms of speed compared to the IP routing (Since
> > > > anyway the same result is got using the Network Processors) ? Anyway
i
> > > > know that MPLS gives lots of other features like QoS,TE,VPNs etc.
But
> > > > generally in the white papers i was reading they always project that
> > > > Label based switching makes the IP routing faster - but this is no
> > > > longer true.
> > > >
> > > > Can somebody give some more thaughts on this ?
> > > >
> > > > Regards,
> > > > Nandan
> > >
> > > -------
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