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RE: Question regarding multi-homed prefix LFA computation

Subject: RE: Question regarding multi-homed prefix LFA computation
From: Kui Zhang
Date: Fri, 15 Feb 2008 19:52:30 +0800


The remaining problem is the relation between node protecting and link protecting inequality. Please read the following words:


As for node-protecting alternatives, I read the following description in section 3.3.  Broadcast and NBMA Links:

“Because the shortest path from the pseudo-node goes through E, if a

   loop-free alternate from a neighbor N is node-protecting, the

   alternate will also be link-protecting unless the router S can only

   reach the alternate neighbor N via the same pseudo-node.”


This means only the SRLG of broadcast and NBMA links make the node-protecting LFA failed to provide link protection. Except for this, node-protecting alternate should always be link protecting. Is that right?




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