Subject: [mpls] Fw: Questions about draft-ietf-mpls-rsvp-lsp-fastreroute-07

From: lidefeng <[email-masked]>
Date: Wed, 10 Nov 2004 12:21:41 +0800

I have some questions about draft-ietf-mpls-rsvp-lsp-fastreroute-07,could you please explain them for me?

(1) What is the difference between "Backup Tunnel" and "Bypass Tunnel", their definitions are as follows:

Bypass Tunnel - An LSP that is used to protect a set of LSPs  passing over a common facility.

Backup Tunnel - The LSP that is used to backup up one of the many LSPs in many-to-one backup.

 (2) In section "5.1 FAST_REROUTE Object", following fields are defined:

Exclude-any: A 32-bit vector representing a set of attribute filters associated with a backup path any of which renders a link unacceptable.

 Include-any: A 32-bit vector representing a set of attribute filters  associated with a backup path any of 

which renders a link acceptable (with respect to this test). A null set (all bits set to zero) automatically 

passes.

My question is： How does PLR know which link is related to the particular bit in the 32-bit vector? i.e. with a particular 32-bit vector value, how does PLR know which links are acceptable, and which links are unacceptable, and if we have the “Exclude-any” vector, why we still need the “Include-any” vector, I think, with the information of links which marked as “unacceptable” by Exclude-any vector, we can get the information of links which marked as “acceptable” by “Include-any” vector.

Thank you very much!

Regards

Defeng Li
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