nanog mailing list archives
Re: [eng/rtg] changing loopbacks
From: "Wayne E. Bouchard" <web () typo org>
Date: Thu, 29 Sep 2005 18:36:35 -0700
On Fri, Sep 30, 2005 at 12:14:46AM +0100, Ian Dickinson wrote:
Randy Bush wrote:Personally, the cleanest way I've been able to accomplish changing this in regard to OSPF, logging and authentication on Cisco's is to suck down the running config, make the changes in your editor of choice, push it back up to startup-config and schedule a reboot. iBGP is much easier to make the changes as you outline.this is my fear. which is why i asked. pushing out new configs (the canonic config is on disk, not the router [0]) and setting a reload of a bunch of routers at time t0 does not give me warm fuzzies about what the world will be like at time tn (n > 0). but i may have to take that path. i am hoping folk will give me a magic pill. after all, any group with such a deep understanding of how to deal with the world's social ills must know a bit of router magic <smirk>.You may need to change your BGP router-id to match if you set it explicitly, which *may* alter path selection (a long way down the tree I admit). Another nasty is if you run TE and use the old Loopback as your TE-ID, even with IS-IS. Plus of course, your zone/hosts file for managing/polling these nodes in the first place :-) -- Ian Dickinson Development Engineer PIPEX ian.dickinson () pipex net http://www.pipex.net This e-mail is subject to: http://www.pipex.net/disclaimer.html
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. IS-IS and OSPF should be able to pick up the change as soon as the IP address is entered into the config. --- Wayne Bouchard web () typo org Network Dude http://www.typo.org/~web/
Current thread:
- [eng/rtg] changing loopbacks Randy Bush (Sep 29)
- Re: [eng/rtg] changing loopbacks David Sinn (Sep 29)
- Re: [eng/rtg] changing loopbacks Randy Bush (Sep 29)
- RE: [eng/rtg] changing loopbacks Neil J. McRae (Sep 29)
- Re: [eng/rtg][vendor specific] changing loopbacks Warren Kumari (Sep 29)
- Re: [eng/rtg] changing loopbacks Ian Dickinson (Sep 29)
- Re: [eng/rtg] changing loopbacks Wayne E. Bouchard (Sep 29)
- Re: [eng/rtg] changing loopbacks Christopher L. Morrow (Sep 29)
- Re: [eng/rtg] changing loopbacks Sean Figgins (Sep 30)
- Re: [eng/rtg] changing loopbacks Randy Bush (Sep 29)
- Re: [eng/rtg] changing loopbacks David Sinn (Sep 29)
- Re: [eng/rtg] changing loopbacks Jake Khuon (Sep 29)
- <Possible follow-ups>
- Re: [eng/rtg] changing loopbacks Austin (Sep 30)