As far as the order or precedence: It depends on if you are applying things inbound or outbound.
Inbound order of precedence: 1) Route-Map 2) Filter-List 3) Prefix-List 4) Distribute-List Outbound order of precedence: (exact opposite) 1) Distribute-List 2) Prefix-List 3) Filter-List 4) Route-Map On Tue, Jan 19, 2010 at 5:42 PM, Rogelio <[email protected]> wrote: > Using the as-set keyword creates an aggregate entry using the same rules > that the command follows without this keyword, but the path advertised for > this route will be an AS_SET consisting of all elements contained in all > paths that are being summarized. Do not use this form of > the aggregate-address command when aggregating many paths, because this > route must be continually withdrawn and updated as autonomous system path > reachability information for the summarized routes changes. > > http://www.cisco.com/en/US/docs/ios/12_3/iproute/command/reference/ip2_a1g.html#wp1037074 > > > I hope this helps. > I can't see why you would want to use it anyways unless you have a transit > AS and I would question the use there as well. I know I wouldn't want one of > my isp's to aggregate my prefixes. Maybe if you have a single ISP and you ip > space was assigned by that ISP but then I would question the need to have an > AS and the need to run BGP. > Am I missing something? > > > Sent from my iPhone > On Jan 19, 2010, at 12:21 PM, Brad Edgeworth <[email protected]> > wrote: > > I just re-read TCP/IP Vol 2 this weekend (I know Mr. Excitement) and after > reading through some of his examples on aggregation. One of my major > questions is why wouldn’t we use the AS-SET when we’re only doing > Summary-Only. (More specifically in the real world) > > > > IE. > > Router BGP 100 > > Aggregrate-address 128.83.0.0 255.255.0.0 summary-only as-set > > > > > > I also found that the FILTER-LIST command is a lot easier than do neighbor > route-maps when filtering off of just AS-Paths. Is there a rule of logic > when you have a ROUTE-MAP and FILTER-LIST. Does it apply against both? > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > -- Regards, Joe Astorino CCIE #24347 (R&S) Sr. Technical Instructor - IPexpert Mailto: [email protected] Telephone: +1.810.326.1444 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA (R&S, Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice, Security & Service Provider) Certification Training with locations throughout the United States, Europe and Australia. Be sure to check out our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
