North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: bgp route-map
Of course; since there isn't a feature, let's propose another idea: an option to enable "le 24" or "le 32/whatever" to cover specific announcements. -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 03:30:01PM -0400, Matt Levine wrote: > > > On Monday, August 25, 2003, at 3:00 PM, Haesu wrote: > > > > >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.. > > Except that what you are proposing would allow your customer to > announce 2 /16's just fine from within one of rob's bogon /8's, as the > 2 /16's wouldn't be in your rib. > > > > >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 > > > > > -- > Matt Levine <[email protected]> > "The Trouble with doing anything right the first time is that nobody > appreciates how difficult it was." -BIX
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