[c-nsp] BGP Black hole

[Oliver Boehmer (oboehmer)]

> On Wed, 2 Mar 2011, Jay Nakamura wrote:
> 
> > That made it work.  Why does that make it work?  I thought
> > ebgp-multihop was used when the peer was not directly connected.  I
> > will go look up the command....
> 
> IOS "thinks" that your 192.168.255.1 is 2 hops away because it is a
static
> route. That is why multihop must be configured.
 
actually: enabling multhop disables the connected-check where IOS checks
if the next-hop of the eBGP path is directly connected. As the next-hop
is rewritten to trigger blackhole, this check failed.
You can also disable the check using "neighbor x.x.x.x
disable-connected-check"..

	oli