From: Peter van Oene (pvo@usermail.com)
Date: Wed Dec 10 2003 - 20:23:52 GMT-3
This is the first hit on Google which I expect you may have already
seen. If not, it is informative.
Essentially, this knob and the IBGP change next-hop one for RR's that it is
included with it give you some more tools to use when migrating an AS from
one number to an other. For example, if you migrated half of your AS from
AS 1 to AS 2, you would be stuck with two IBGP meshes. With normal EBGP
between the meshes, assuming you used the same peering topology you have
for I with E, you'd end up with all new traffic flows due to the next hop
change at the 1/2 border. With this knob, you can make E behave like I (in
terms of NH settings) and so long as you have IGP reach ability for NH
resolution over both 1 and 2, you can merge these networks without changing
your traffic flow. This allows you to take a slower approach to AS number
changes.
If you have ever considered a flash cut of 50+ routers in one night to
change ASN's, you might see where this knob would be helpful.
At 02:10 PM 12/10/2003, you wrote:
>Hello,
>
>Does anybody have a config scenario where "neigbhor next-hop-unchanged" is
>used? I tried searching cco but no luck.
>
>
>Thanks
>
>_______________________________________________________________________
>Please help support GroupStudy by purchasing your study materials from:
>http://shop.groupstudy.com
>
>Subscription information may be found at:
>http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sat Jan 03 2004 - 08:25:39 GMT-3