[alcatel-nsp] Advertising prefixes to BGP peer.
andrew.koch at gawul.net
Mon Dec 13 17:18:20 EST 2010
On Mon, Dec 13, 2010 at 15:24, Stefano Gridelli <sgridelli at gmail.com> wrote:
> You can use black-hole routes:
> static-route <IP>/<mask> black-hole
> then you can manipulate BGP attributes with a router policy (community, ASN)
> in the accept statement ...
Except that you have now just black-holed the traffic if all that you
are receiving inbound from your downstream is a /23. The two new /24s
to the black-hole are more specific and win. You would need to set
your static route statements the next-hop to the down-stream, but this
is all defeating the purpose of setting up BGP. What is the intent of
breaking up a nicely aggregated /23 to 24s? If you are looking for
traffic engineering, potentially you could look to other methods such
as prepends and MEDs.
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