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Re: [eng/rtg] changing loopbacks
- From: Christopher L. Morrow
- Date: Thu Sep 29 21:45:17 2005
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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