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Label space of a label advertised through MPLS-BGP

  • From: Shahram Davari <Shahram_Davari@pmc-sierra.com>
  • Date: Mon, 27 Nov 2000 13:16:42 -0800
  • Cc: James_Huang@Mitel.COM, mpls@UU.NET

Hi James,
 
> Which draft makes this assertion?  I consider hierarchy to 
> include the case
> where the top label is ATM/FR and the rest of the label stack 
> is composed of
> generic labels under the require "NULL" label.

The main reason of having per-platform label space is that when an egress node of a hierarchical tunnel distributes an inner label to its remote peer, it does not know from which interface that LSP will arrive (this might be due to the use of TE that changes the outer LSP). In other words the label below the top label needs to be from the per-platform label space not the top level label that is VPI/VCI.

Regards,
-Shahram