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MPLS on Interface

  • From: Devendra.Vyas@relianceinfo.com
  • Date: Sun, 23 Jan 2005 22:58:48 +0530
  • Resent-Date: Sun, 23 Jan 2005 12:29:23 -0500
  • X-MIMETrack: Serialize by Router on RILWHUB010/SVR/RIL(Release 6.5|September 26, 2003) at01/23/2005 10:58:55 PM
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The way im approaching the question is -

Originally MPLS was developed for getting the speed of L2 and the ease of L3.although this original intention is no longer the main driver for deploying MPLS.....but TE,VPN's,COS are all DERIVED applications.

suppose i forget these derived applications and talk about a basic MPLS cloud what would be the nature of traffic flow across it - that is the question...
granted that the routing packets would be IP forwarded.




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> so then how does MPLS decide whether -
>
> packet x needs to be stamped (or not)?

I believe the most common case is that the packet is received on an
interface which is a member of a VRF (yes, this implies MPLS VPNs).

> what trigger converts the potential push into actual?

The packet needs to be sent on a core-facing interface with MPLS
enabled. (This doesn't always happen - the packet could also be sent
on another interface which is a member of the same VRF, and thus would
not need a label.)

> suppose there is an MPLS cloud - running IGP,MPLS and LDP and there
> are no TE-LSP'S and NO VPN's...
>
> and within the cloud i ftp from router x to router y --will that
> traffic be label switched?

No, why should it?

Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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