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North American Network Operators Group

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Re: [eng/rtg] changing loopbacks

  • From: David Sinn
  • Date: Thu Sep 29 14:27:56 2005

Are you using any logging-source or source interface for your authentication on the boxes? I've found that most versions of IOS require a reboot to accept a change of these.

Similarly, OSPF under IOS will need a bounce/reboot to change it's router-ID if you are using the loopback for that.

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.

As always, your mileage may vary.


On Sep 29, 2005, at 11:05 AM, Randy Bush wrote:

so i have junipers, ciscos, and a few <gasp> zebras in an ospf
and ibgp mesh.  they're peering via loopbacks, of course.
unfortunately, i need to recover the space from which the
loopbacks are taken.  of course, i would like to do so with
minimal disruption.  i am thinking of something like the

  o add second loopbacks to all routers with new address in new
  o set up ibgp peerings to new addresses from existing
  o change the source of routing updates to new addresses
  o remove old peerings
  o remove old loopbacks

what [else] am i missing?


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