North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: bgp route-map
Yes, I've tried that too.. But what I am thinking of doing is, using a route-map/bgp-announcement based version of building 'prefix-list' or 'distribute-list' to decide whether to accept route or not.. But as you said, I don't think that is possible heh.. Thanks! -hc -- Sincerely, Haesu C. TowardEX Technologies, Inc. WWW: http://www.towardex.com E-mail: [email protected] Cell: (978) 394-2867 On Mon, Aug 25, 2003 at 02:57:57PM -0400, [email protected] wrote: > I don't think what you are suggesting is directly possible, although I can think of > something that accomplishes the same thing, and only requires extra configuration on > the peering session with the route server. > > For prefixes recieved from the bogon route server, apply a route map that will (1) > send traffic to a Null0 bit sink and (2) set the local preference for these routes to a > value suitably large so that the same prefixes learned from other peers never get > used. > > -w > > On Mon, 25 Aug 2003 14:39:59 -0400, Haesu wrote > > Hi all, > > > > Wondering if anyone would know whether such feature in IOS exists or > > not... > > > > Most of the time, people use route-maps on bgp neighbors or peer- > > groups to set an attribute,etc on a prefix that is being announced > > OUTbound or INbound. > > > > However: On prefixes being announced to me INBOUND, is there a > > feature to set in route-map so that it checks whether the > > advertised prefix is already existing in local RIB? > > > > Like for example, I am one of the users who receive bogon > > advertisements from Rob's route-server. > > > > Now, when I receive prefixes either from my upstream AS or my > > customers doing bgp with me, I can setup a route-map on the neighbor > > so that it compares the prefix being announced by neighborAS with > > existing Rob's bogon prefix in the RIB with bogon route-server > > community 65333:888. > > > > If the prefix being announced gets a match with existing prefix with > > 65333:888 already in the router, the route-map would cause a DENY. > > Thus, making Rob's bogon announcement from his route-server, a bogon > > route filtering list for me to use on my customers/peers.. > > > > If you are not understanding what I am saying, feel free to yell at > > me to clear up.. > > > > This would make it much easier to create dynamic bgp-based route > > filtering list in my opinion... I am not here to discuss the > > feasibility of whether doing or inventing this dynamic method of > > filtering bgp routes; I am rather asking this question to see if > > anyone is doing something similar to this as it may be useful. > > > > Thanks! > > > > -hc > > > > -- > > Sincerely, > > Haesu C. > > TowardEX Technologies, Inc. > > WWW: http://www.towardex.com > > E-mail: [email protected] > > Cell: (978) 394-2867
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