[c-nsp] Filtering BGP routes with route-map vs. not getting them in

[OCOSA ListAcct]

True if really want to use option b...

use this string to get routes directly connected to your upstream or 
originated.

ip as-path access-list 5 permit ^upstream as goes here_[0-9]*$

or


to deny any networks originated form your upstream...and allows 
everything else which could be bad if your router does not have at least 
512MB

ip as-path access-list 6 deny _upstream as goes here$
ip as-path access-list 6 permit .*


If I remember correctly you can also limited the amount of prefixes a 
neighbor can send you...

router bgp as number
nei x.x.x.x maximum-prefixes and the rest....

I think the command is


Otis

Kristian Kielhofner wrote:
> Hello everyone,
>
>   I'm back with another stupid "BGP on a 3750" question.  I need
> "customer only routes" to the few providers that I have.  From what I
> can tell, I'd end up with far less than the 8,000 max routes this
> platform can handle.  I have two options when configuring this:
>
> a)  When bringing up the BGP session, I can request aggregated
> customer-only routes (what I want).
>
> or...
>
> b)  I can request a full table and filter them myself with route-map
> statements (I think).
>
>   With "a" I will have a much simpler configuration (not that it
> matters much).  Will the 3750 have problems even receiving these
> routes, even if I am filtering them?  I can imagine all sorts of
> potential nastiness with that configuration.
>
>   If not, I'd much rather go with option "b".  I would have more
> control over my routing and it would be easier to upgrade to a more
> capable router in the future (less co-ordination with ISPs, just
> remove route-map statements).  I like this idea more.  Can the 3750 do
> it?  What would happen?
>
> Thanks!
>
>