Re: Overlapping Routes

[Dave Katz <dkatz at JUNIPER.NET>]

On Apr 15, 2005, at 2:22 AM, Tom Petch wrote:

> Agree with everything Dave saids but would stress that OSPF by design 
> does not
> cater for overlapping prefix (from the same router) so a router MUST 
> NOT
> originate two LSA, one a /24 and the other a /28 for the same prefix.  
> Other
> routing protocols are different which is an issue when redistributing 
> from them
> into OSPF.

Do not confuse the encoding of the LSA IDs with the concept of 
advertising overlapping routes.  It is perfectly reasonable to 
advertise overlapping routes, if not necessarily too useful.  In fact, 
all the gorp in appendix E is to specifically support overlapping 
routes (because of the screwed up LSA ID encoding.)

--Dave