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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?
zhangkui
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