[c-nsp] BGP config question

David Barak thegameiam at yahoo.com
Mon Feb 18 21:30:45 EST 2008


--- On Mon, 2/18/08, Wayne Lee <linkconnect at googlemail.com> wrote:

> I've had a crack at the config and was hoping you guys
> could point me
> in the correct direction or point out any errors.
> 
> router bgp 29xxx
>  network 217.xxx.xxx.0 mask 255.255.240.0  <----- Get rid of this line

The customer should originate their own BGP network, and you, as the transit provider, should just pass their route on to your upstreams.


>  neighbor 82.xxx.xxx.162 remote-as 20xxx
>  neighbor 82.xxx.xxx.162 description eBGP transit for
> customer
>  neighbor 82.xxx.xxx.162 password ************
>  neighbor 82.xxx.xxx.162 prefix-list AS20xxx-in in
>  neighbor 82.xxx.xxx.162 distribute-list 190 out
>  neighbor 82.xxx.xxx.162 filter-list 10 out
> 
> ip prefix-list AS20xxx-in seq 5 permit 217.xxx.xxx.0/20
> ip prefix-list AS20xxx-in seq 10 deny 0.0.0.0/0 <--- not needed, there's an implicit deny at the end.

You might want to modify your prefix list to permit a small deaggregation for traffic engineering (217.x.x.0/20 le 22 for instance), and something which is probably worth putting into place now (before you've got a zillion BGP transit customers) is "neighbor 217.x.x.0 max-prefix x". 

> Thanks in advance for your time.

you're welcome,

David Barak
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