[c-nsp] BGP routes co-existing with different local-preference

[Kristofer Sigurdsson]

Hi,

We just hit some weird behavior in a Cisco 7500/RSP8 and RSP4, running 
IOS 12.0(24)S6.  This router is one of two upstream routers for our AS.
Both of the routers are receiving full routes from their respective 
upstream.  For traffic engineering purposes, both of them have a certain
set of routes they set to a higher local preference.

Now, when the 7500 has 2 routes to the same destination, from it's 
upstream and from the other edge router and the route received from
the other edge router has a higher local preference, the 7500 does
not advertise his route (the one with the "normal" local preference)
to other routers within our AS.
If I set the weight of those routes (in the 7500) to 250, it advertises
them.

Now, shouldn't the router advertise it's routes, even if there's another
route that is preferred?  The outcome from this would be if
the preferred outgoing edge router lost connectivity, the less preferred
route would not be in the other routers BGP tables, so no connectivity,
which is a bad thing (TM).

Cisco 7200 running 12.2S seems to do this the way I want (advertise all
routes to the other routers within the AS and let them choose).

Any pointers would be appreciated...

Regards,
Kristofer