Les, For all maintenance purposes there is need to drain the traffic from the router before hitting reload or powering it off.
Sure services can be removed for that. But since Peter claims we need to care about networks where no BGP is used how do I indicate domain wide that I am going to bring the box down gracefully when it still is forwarding packets in flight such that ingress points can gracefully switch it to a backup paths. To me PULSE could fit that bill. But it seems you are resisting to use it in such way. So the question stands - how to do it ? Thx, R. On Wed, Dec 1, 2021 at 5:58 PM Les Ginsberg (ginsberg) <[email protected]> wrote: > 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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