Robert –
Regarding OL bit, normal SPF procedures are used. For destinations which
transit the router that path will no longer be used. If that makes a given
destination unreachable then a pulse will be generated.
For prefixes advertised by the OL Router, those are still considered reachable.
Implementations may have knobs to withdraw prefix advertisements when OL bit is
set. If that occurs, again – normal SPF procedures are used.
Regarding max-metric, I do not see that it is relevant. Operators who use
max-metric as part of their maintenance procedures are not taking a router
completely out of service – they are simply making it a path of last resort.
If they want to take the node out of service they are going to have to shut
links or disable protocol operation entirely on those links. So again I do not
see that any special consideration of max-metric is needed.
Les
From: Robert Raszuk <[email protected]>
Sent: Wednesday, December 1, 2021 7:36 AM
To: Peter Psenak (ppsenak) <[email protected]>; Les Ginsberg (ginsberg)
<[email protected]>
Cc: lsr <[email protected]>
Subject: Re: [Lsr] BGP vs PUA/PULSE
Peter and Les,
Do you plan to have a provision to suspend PULSE generation for the planned
maintenance windows where service reachability was removed before PE went down ?
What was the conclusion in respect to MAX AGE and OL bits ?
Thx,
R.
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