The MPLS-OPS Archive

[Sidnie Feit <sfeit@vnet.net>]

I agree with Adita --
The elements of control and QoS are critical.

A backbone MPLS/IP network can be managed like a Frame Relay or ATM network,
with Admission Control imposed at the entry point.

MPLS label switching makes "router" label switches peers to FR and ATM 
label switches,
making the true network structure visible and usable. If the extension of 
the signaling protocol to the layer 1
infrastructure works, there will no longer be layers of obscurity in the 
network structure.

Sidnie

At 01:59 AM 3/26/2001 +0500, Aditya Chugh wrote:

>Hi Tarig,
>  To add to what Sidnie has said , each LSR in an MPLS domain is a 
> superset of an IP Router
>i.e all LSRs also support traditional IP forwarding
>The MPLS label is on the outside....and the IP header is inside.
>At the time of data forwarding , the MPLS label is looked at.
>The LSR should not even need to look at the destination IP address.
>The efficiency of the forwarding paradigm provided by MPLS comes from the 
>fact
>that Labels have a small fixed  size.Therefore table lookup is much faster 
>for labels( where we are looking for an exact match)as compared to finding 
>the longest prefix match in case of IP forwarding.
>
>But this is not the major driver for MPLS technology currently because
>in most implementations data forwarding is done in Hardware(because of the 
>higher speeds possible).
>I think the major benefits of MPLS lie in its ability to provide 
>traffic-engineering,QoS,constraint based routing etc
>HTH,
>Aditya
>
>-----Original Message-----
>From: tarig ballal [<mailto:tarigb@yahoo.com>mailto:tarigb@yahoo.com]
>Sent: Thursday, March 22, 2001 4:04 PM
>To: mpls-ops@mplsrc.com
>Subject: mpls question
>
>Hi,
>    I have question.
>When a packet comes into a router supporting both
>MPLS and conventional IP forwarding,on processing,
>will the IP address be looked at first?Or the presence
>of a label is checked first?
>     In both cases,doesn't this add to the processing
>delay and thus decreases the efficiency of the
>forwarding paradigm provided by MPLS?
>
>   Thanks
>
>
>
>
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