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questions about draft-ietf-mpls-rsvp-lsp-fastreroute-02.txt

  • From: "Prabakaran T Sampath" <prabakarts@future.futsoft.com>
  • Date: Tue, 15 Jul 2003 14:50:55 +0530
  • Cc: <mpls@UU.NET>, "'Terry Lee'" <TERRYLEEE@SOHU.COM>
  • Importance: Normal

Title: 邮件
Hi Terry Lee,
 
Creating a bypass tunnel in advance and associating with the interface is a explicit
thing.  If we want to create a bypass tunnel dynamically during LSPs signaling means,
In my understanding, it is an implementation  specific, 
one possible way could be each PLR can create a bypass tunnels dynamically
based on the  RRO objects, where in we could find the exact path the LSPs
traversed, using this we can make a decision for the node/link which we need to protect,
using CSPF we can exclude certain link or node for establishing the bypass
tunnel from PLR to MP and then associating with the Protected LSP at the PLR for FRR operation,
but we also need to take care of Bandwidth protection needed flag operation
while establishing bypass tunnel if it is enabled. 
The complexity, scalability and other issues involved in this approach need to be explored.
 
Thanks and regards,
Prabakaran T.S.
Future Software Limited,
480-481, Anna Salai,
Chennai - 600035, India.
Off Phone: +91-44-24330550 - Extn: 319
-----------------------------------------------------------  
 -----Original Message-----
From: owner-mpls@uu.net [mailto:owner-mpls@uu.net]On Behalf Of Terry Lee
Sent: Tuesday, 15 July 2003 6:55 AM
To: 'Alia Atlas'; Prabakaran T Sampath
Cc: 'mpls@uu.net'; Terry Lee
Subject: RE: questions about draft-ietf-mpls-rsvp-lsp-fastreroute-02.txt

Thanks a lot.
 
I have another question. In section 6.4, it states as following :
 
   6.4 Signaling for Facility Protection
  
      A PLR may use one or more bypass tunnels to protect against the
      failure of a link and/or a node.  These bypass tunnels may be
      setup in advance or may be dynamically created as new protected
      LSPs are signaled.
 
My question is how to create the bypass tunnels dynamically?
how do the LSRs in the protected path know to be PLR and to create bypass tunnel with what attributes like destionation etc.