Hey guys, I think it depends on what the scenario is, and what the next-hop is of the VPN route. For example, if you are doing MP-EBGP between route-reflectors in inter-AS scenario, the PE routers may need labels for the PE routers in the other AS. If you do not have send-label between the RRs and the PEs (IBGP) then the PE routers cannot properly tag the packets.
On Fri, Oct 30, 2009 at 9:36 AM, Shai Loufton <[email protected]> wrote: > I am now actually on a proctor labs' 7200/ATM Rack now doing the second > VOL II lab and I see exactly what you describe – it works with just enabling > "send-label" on the ASBRs (and "set mpls-label" if there is a route-map in > between). > > > > I cannot think of a reason of doing the LSP as a BGP LSP from end to end – > can anyone else comment here about this also? > > > > BTW – thanks André Luiz Bernardes for helping me before …. – I will do the > 1st lab tomorrow again – hopefully will understand it all and all will > work eventually after I am done with it …. > > > > > > Shai L > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Andr? Luiz Bernardes > *Sent:* Friday, October 30, 2009 4:17 PM > *To:* [email protected] > *Subject:* [OSL | CCIE_SP] BGP Labels, send or not to send.... > > > > Hello guys > > I have this doubt here.. when configuring Inter-AS VPN we have to build an > e2e label path to get VPN traffic flow between ISPs. Most of the times we > are required to exchange loopbacks labels via IPv4 eBGP sessions between ASs > since LDP is not allowed. > > Well... I have done this several times already on different vendor's > wookbooks and that works fine just by configuring BGP send-label feature > (and mpls set-label on route-maps) only on EBGP sessions. My questions is > why worbook solutions always require configuring BGP label distribuition > also for IBGP session? Is this just a best practice or is there any > underlying issue that does not come up on workbook scenarios due to reduced > topology... > > Thanks > > Andr'e > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > -- Bryan Bartik CCIE #23707 (R&S), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
