[RRG] Ivip6 - Forwarding Label in the Core

[Robin Whittle <rw@firstpr.com.au>]

I have changed the name of this technique somewhat from "Routing
Label" to "Forwarding Label".

A full explanation is here:

  http://www.firstpr.com.au/ip/ivip/ivip6/

This includes a chart of how the packet is handled by the ITR,
various core routers and the border router at the recipient provider
network:

  http://www.firstpr.com.au/ip/ivip/ivip6/#chart

which most RRG folks will be able to follow easily.

The longer explanation is for people who want more detail - or for
people who are not so up to speed with the RRG discussions and Ivip.

  - Robin

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