Re: how well will IDRP nee BGP work?

[Tony Li <[e-mail]>]

   > I believe that major pain of renumbering is with hosts nor routers. Hence,
   > I guess, some manual re-configuration of routers is acceptable and
   > probably unavoidable.  Do you think otherwise?

   I am not so sure.  Hosts effectivly need to be treated once. The
   routers will be different. The routers carry complex configurations
   and access-lists.  Hand crafting them is hard enough w/o the
   requirement to readjust them every time you, your provider, or any
   of your peers renumbers, particularly when this is done with any
   regularity.  In this case a more simple construct of static routes
   may be easier to manage.

Let's talk reality here:  there are two cases that need to be
considered.  Either the DMZ is being renumbered, or it's an internal
renumbering.  No renumbering is necessary for any prefixes which are
wholly internal to your provider or your peer.  [Yes, if your prefix
changes because your provider's prefix changed, then you renumber...
see case 2.]

If a DMZ is being renumbered, then you may have a number of neighbors
to renumber.  Upload config, run a sed script (in the tradition of
this group), download config.  Manually remove old neighbors when
stable.  Effective thinking time: 10min.

If it's an internal renumbering, then a NAME will only suffice if you
can beat the chicken and egg problem (as has been pointed out) AND if
you have names that are specific to the interface that you want to
peer with (usually a loopback address).  Iterate above procedure for
all BGP peers.

Note that with automatic discovery, some folks might want to consider
how this works in the face of the two hierarchical distribution
techniques.

Tony