In all the training and documentation I have done you are always told to use the neighbour x.x.x.x route-map xxxx out method when you are changing/modifying attributes.
On 17 Jan 2011, at 16:59, Ramcharan, Vijay A wrote: > I've never used that method to do as-prepending but I tried it in a lab > and it didn't work. Perhaps I'm missing something as well. > > Reading the BGP-4 handbook by Parkhurst, page 250 says that "In theory, > these commands allow you to modify a network's BGP attributes. In our > experience, they are too buggy and should not be used." > > I used the same route-map in a neighbor statement and it as-prepended as > expected. > > router bgp 2 > bgp log-neighbor-changes > neighbor 10.0.50.4 remote-as 4 > neighbor 10.0.50.5 remote-as 5 > ! > address-family ipv4 > neighbor 10.0.50.4 activate > neighbor 10.0.50.4 route-map asprepend out ===> WORKS > neighbor 10.0.50.5 activate > no auto-summary > no synchronization > network 1.1.1.0 mask 255.255.255.0 route-map asprepend ===> Doesn't do > anything > exit-address-family > ! > route-map asprepend permit 10 > set as-path prepend 2 2 2 > ! > > Downstream-2600-4#show ip bgp > BGP table version is 19, local router ID is 10.0.50.4 > Status codes: s suppressed, d damped, h history, * valid, > best, i - > internal, > r RIB-failure, S Stale > Origin codes: i - IGP, e - EGP, ? - incomplete > > Network Next Hop Metric LocPrf Weight Path > * 1.1.1.0/24 10.0.50.2 0 0 2 2 2 2 i > *> 10.0.0.5 0 1 5 2 i > Downstream-2600-4# > > Vijay Ramcharan > > >> -----Original Message----- >> From: [email protected] [mailto:cisco-nsp- >> [email protected]] On Behalf Of Elmar K. Bins >> Sent: Monday, January 17, 2011 10:11 AM >> To: [email protected] >> Subject: [c-nsp] Preloading AS to static network entry via route-map: > Duh? >> >> Re guys, >> >> the prefixes I give out are being rooted by "network" entries with >> a route-map attached (like "network a.b.c.d/e route-map <rm>"). >> >> In that route-map, I'm simply prepending an ASN ("as-path prepend > <as>"). >> >> Well - that prepend never makes it to the outside world. Source ASN is >> simply my ASN, the desired <as> is nowhere to be found. >> >> Am I wrong in assuming it should work that way? >> >> Oh, platform is an ASR1002, IOS-XE 12.2(33)XNC1t. >> >> Didn't try my 7301s yet... >> >> Elmar. >> >> _______________________________________________ >> cisco-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
