North American Network Operators Group
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Re: Best Practices for Loopback addressing (Core routers & VPN CPE)

  • From: Guy Tal
  • Date: Fri Jun 06 17:12:30 2003 
On Fri, 6 Jun 2003, Daniel Golding wrote:

> Consider the situation where you have a peer or customer who needs to do
> ebgp multihop peering from loopback to loopback. This happens
> infrequently, but it does happen. You need public IP address space to
> (reasonably) make this work. I know you are assuming this won't happen,
> but the day you need to provision two OC-12s to the same provider or peer,
> and want to load balance them effectively...

Well, as you mentioned, it's fairly infrequent that these situations
arise, but it's not unheard of. However, in this case, you can always take
an IP address out of the interface pool and create another loopback
address specifically for the purpose of load balancing to the
peer/customer.

I'm actually not advocating using 1918 address space in the backbone, just
trying to point out a solution to a problem. :)

Guy