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RFC 3443

  • From: francis.arts@alcatel.be
  • Date: Sat, 9 Aug 2003 09:11:58 +0200
  • X-MIMETrack: Serialize by Router on BEMAIL06/BE/ALCATEL(Release 5.0.11 |July 24, 2002) at08/09/2003 09:12:00,Serialize complete at 08/09/2003 09:12:00
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Hello,

I have a question on RFC 3443. Consider the following LSR:

                              +=====+     +=====+     +=====+     +=====+
                        ===|    A     |===|     B     |===|     C    |===|     D    |===
                              +=====+     +=====+     +=====+     +=====+

                                           LSP1      0=========X========0
                    LSP2      0=========X==================0

Assume that LSR D has advertised the implicit null label for LSP2.

Assume that LSR B receives from LSR A a packet with the following TTLs:
* ip-ttl = 20.
* mpls-label-lsp2-ttl = 9.
What are now the ip-ttl and mpls-label-lsp1-ttl values of the packet that LSR B sends to LSR C? Please consider the different possible cases where LSP1 and LSP2 can be of the uniform, pipe or short pipe model respectively.

Regards,

        Francis.