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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: [eng/rtg] changing loopbacks
On Thu, 29 Sep 2005, Wayne E. Bouchard wrote: <chopped ian's good infos> > > Of course, you can always pre-deploy ibgp sessions and TE configs to > the new address (which will remain down until the new address exists), > go for your OOB access to the box, change the loopback IP address (and > associated references), "clear ip bgp *" and accept the 2 minute > interruption. Changing loopback IPs is difficult to do gracefully but > can still be done relatively quickly. The clearing MIGHT have a larger effect, especially depending on the number of peers you have and this device's placement in your network. I'd think that a graceful bgp switchover would be simple enough (and wouldn't require clear ip bgp *) The devil, IMHO, is in the IGP switches :( (not withstanding ian's noted bgp router-id change) > > IS-IS and OSPF should be able to pick up the change as soon as the IP > address is entered into the config. > ospf doesn't, for router-id on cisco's atleast, as Warren pointed out :( however! switching from ospf to 'another igp' (ISIS would work well) would avoid that, slide off ospf and onto ISIS, kill ospf when all next-hops switch, which should be 'as soon as isis converges'.
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