actually the main ring consists of 11 routers , 2 Cisco 7606-S and 9 ME6524 Cisco switches there are small sub-rings connected to the main ring right now i dont have BGP running inside my network except for OSPF on area 0
> Date: Sat, 14 May 2011 17:50:39 +0100 > From: [email protected] > To: [email protected] > CC: [email protected] > Subject: Re: [c-nsp] OSPF on Ring Networks > > On 14/05/2011 16:05, Christian Meutes wrote: > > Here it depends. If the next-hop changes OSPF will in most cases converge > > faster than BGP. So if there aren't that many routes and you can live with > > less policy possibilities I would prefer OSPF over BGP for carrying > > non-infrastructure networks. > > yes if the next-hop changes, but network topology change events will often > not cause a next-hop change, just a SFP recalculation - which means that if > your SFP domain is smaller, it will converge faster. I.e. the router's FIB > may be updated, but ibgp will not be aware of the topology change. > > The things that cause next-hop changes are customer edge flaps. > > As regards carrying non-infrastructure prefixes in OSPF, it really depends > on how big your network is. For small networks it doesn't matter very > much. For large networks, there is no choice other than ibgp because > having a functional prefix management system is more important than shaving > a couple of seconds off a customer edge link-up event. For networks in the > middle, they usually start out by putting non-infrastructural prefixes into > the IGP but change later on because it doesn't scale well and having a > flexible interior routing policy becomes more important than fast convergence. > > > BFD, MPLS-FRR, SPF- and Flood-Tuning for even faster convergence. > > ...and for even more CPU load. > > Nick > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
