Curtis,Erblich, Could we focus on the key question of cascaded restarts, how to make sure the topology is stable before and after each restart ?. Automatically.
How to make a deterministic planning, so we can know where the holes are and what is the impact. Has anyone thought on these lines ? Thanks, Abhay ----- Original Message ----- From: "Curtis Villamizar" <[EMAIL PROTECTED]> To: "Erblichs" <[EMAIL PROTECTED]> Cc: "Abhay D.S" <[EMAIL PROTECTED]>; <[email protected]> Sent: Tuesday, October 23, 2007 12:00 PM Subject: Re: [OSPF] Cascaded Graceful Restarts with NSF for OSPFprotocolQuestion > > In message <[EMAIL PROTECTED]> > Erblichs writes: > > > > Abhay D.S., > > > > > > Actually it is just a bit more > > complicated. > > > > With OSPF, we should start with a case > > of two routers. > > > > How does the restarting router know > > that the restart is done and how does > > the other router know that the restart > > is done? > > > > The restarting router can determine > > whether NSF and restart is done. Whether > > restart required a a standard resync of > > the LSDB is almost irrelevant. > > > > So, the question is why must Gracefull > > be successful? It basicly just "reduces" > > overhead while NOT distrupting forwarding. > > More important it does not slosh all of the BGP routes (hundreds of > thousands of them) away from the restarting router and then back. > In an IGP only transient routing nasties due to inconsistent notion of > whether that router is up or not is something to be avoided (you know, > transient loops, transient blackholes, and all that). > > > Thus, It is done when it re-starts sending HELLOs > > and re-extablishes full adjs from the perspective > > of the 2nd router. The hellos are the aliveness > > criteria from my earlier post. > > > > ` So, you MIGHT want to track the nbr FSM > > if you have access to the OSPF source code. > > > > Mitchell Erblich > > ---------------- > > > > > > "Abhay D.S" wrote: > > > > > > Mitchell, > > > > > > 2) Their is no GUARANTEE that any Restart will > > > be sucessful, that the LSDB will be stable and/or > > > that helper(s) exist. > > > > > > I wanted an automated and deterministic number 2. > > > > > > Any ideas or any attempts in the direction of 2 ? > > > > > > With Regards, > > > Abhay > > > Looks to me to be more like a windmill than a dragon. > > Curtis _______________________________________________ OSPF mailing list [email protected] https://www1.ietf.org/mailman/listinfo/ospf
