nanog mailing list archives
Re: more-specifics in class B space?
From: Jeremy Porter <jerry () fc net>
Date: Fri, 24 Mar 2000 19:23:28 -0600
Looks like they have a routing registry to me: whois -h rr.level3.net 63.211.112.0 % RIPEdb(3.0.0a13) with ISI RPSL extensions route: 63.211.112.0/24 descr: /24 for Wayport POP origin: AS14654 mnt-by: WAYPORT-MNT changed: noc () wayport net 20000322 source: LEVEL3 Why the bogus route, I don't know. Although this is pretty good: whois -h rr.level3.net 63.0.0.0 % RIPEdb(3.0.0a13) with ISI RPSL extensions route: 63.0.0.0/13 descr: UUNET, An MCI Worldcom Company 3060 Williams Drive Fairfax VA 22031 USA origin: AS701 mnt-by: MAINT-AS701 changed: juzer () UU NET 19981110 source: RADB In message <Pine.BSF.4.20.0003241745280.511-100000 () alive znep com>, Marc Slemko writes:
Cute. So, further to this, I noticed that AS3356 (level3.net) was advertising a route for 63/8, on and off. Doesn't seem to be advertised right now, but it comes and goes. Example history entry from a couple of minutes ago: BGP routing table entry for 63.0.0.0/8, version 5217053 Paths: (14 available, no best path) Not advertised to any peer 10764 5646 1239 3356 3356 3356 (history entry) 206.220.240.223 from 206.220.240.223 (206.220.240.223) Origin IGP, localpref 100, external Dampinfo: penalty 464, flapped 1 times in 00:17:10 5056 3561 3356 (history entry) 167.142.3.6 from 167.142.3.6 (167.142.3.6) Origin IGP, localpref 100, external Dampinfo: penalty 467, flapped 1 times in 00:17:00 267 1225 1325 1673 701 3356 (history entry) 204.42.253.253 from 204.42.253.253 (204.42.253.253) Origin IGP, localpref 100, external Community: 267:1225 1225:80 1225:1325 Dampinfo: penalty 732, flapped 2 times in 00:17:08 1755 1800 1239 3356 3356 3356 (history entry) 192.121.154.25 from 192.121.154.25 (192.121.154.25) Origin IGP, localpref 100, external Dampinfo: penalty 469, flapped 1 times in 00:16:50 293 1800 1239 3356 3356 3356 (history entry) 134.55.24.6 from 134.55.24.6 (134.55.20.229) Origin IGP, localpref 100, external Dampinfo: penalty 458, flapped 1 times in 00:17:24 1849 702 701 3356 (history entry) [...] Why are they doing this? Who knows, they don't respond to email. But I notice that they are advertising a whole bunch of /24s, /23s, and other sub /20 blocks under 63/8. What a great solution; "hey, people can't reach us because we are advertising bogusly small blocks, so lets just advertise an aggregate for the whole /8 to make sure everyone listens to it". Riiiiiiiiight. The concept (ie. advertise an aggregate, even if it doesn't go to exactly the right place, then also advertise more specifics; if someone filters the more specifics, the aggregate will serve to get traffic to a network that does listen to the more specifics) does often work as long as your network topography is simple enough, it sure doesn't cut down on route bloat. Insert standard rant about having a clue before advertising routes, not advertising bogusly small blocks, routing registries, etc.
--- jerry () fc net Director Network Operations/Network Engineering, Wayport, Inc. 512-519-6193 www.wayport.net 8303 Mopac Expressway Suite A300, Austin Tx.
Current thread:
- more-specifics in class B space? Tom Spindler (Mar 22)
- Re: more-specifics in class B space? Jim Mercer (Mar 22)
- Re: more-specifics in class B space? Randy Bush (Mar 22)
- Re: more-specifics in class B space? Jim Mercer (Mar 22)
- Re: more-specifics in class B space? Randy Bush (Mar 22)
- Re: more-specifics in class B space? Randy Bush (Mar 22)
- Message not available
- Re: more-specifics in class B space? Jim Mercer (Mar 22)
- Re: more-specifics in class B space? Jim Mercer (Mar 22)
- Re: more-specifics in class B space? Joe Provo - Network Architect (Mar 22)
- Re: more-specifics in class B space? Brian Wallingford (Mar 22)
- Re: more-specifics in class B space? Marc Slemko (Mar 24)
- Re: more-specifics in class B space? Jeremy Porter (Mar 24)
- Re: more-specifics in class B space? Deepak Jain (Mar 24)
- Re: more-specifics in class B space? Larry Snyder (Mar 24)
- Re: more-specifics in class B space? Jeremy Porter (Mar 25)
- Re: more-specifics in class B space? Patrick Greenwell (Mar 24)
- <Possible follow-ups>
- Re: more-specifics in class B space? Sean Donelan (Mar 23)