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Re: MPLS on Interface/ recursive VPNS

  • From: sthaug@nethelp.no
  • Date: Sat, 22 Jan 2005 11:21:47 +0100
  • Cc: mpls-ops@mplsrc.com
  • Resent-Date: Sat, 22 Jan 2005 05:53:22 -0500
  • X-SpamProbe: GOOD 0.0000000 701abd0ffeb590677183eacde7ee836e

> <html><body>

Please don't use HTML for email on this mailing list.

> 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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