Hi, On Sun, Feb 15, 2015 at 04:49:44PM +0200, M K wrote: > HiI have ASR9k , I got a new connection from a provider through SDH (active , > backup)How can I trace if I lost connectivity as there is L2 device in > between and move the traffic over the backup link > My crystall ball is fogged today.
If it's *SDH* "active, backup", your router will not even notice that
SDH switched to the backup path - that's what it is for, almost-instant
cutover ("as soon as the first SDH frame is corrupted"). No way to
see this from the router (that I know of), this is all happening inside
SDH, so the SDH monitoring needs to pick this up.
If you're talking about having two different links connected to your
router - well, basic routing 101, I'd say. Turn on an IGP, set metrics
to "active, backup", and off you go...
gert
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