Having read up a lil :-), I concur with Keller that with a different RD per PE we will have 2 VPNV4 (diff RD + same IPV4)routes originating from 2 different PEs seen as different from the route-reflector perspective and this achieves a load sharing objective.Normally service providers do this.For simpler setups this isnt necessary. this helped clarify https://supportforums.cisco.com/thread/2102281
Regards, Mo On Wed, Aug 15, 2012 at 4:01 PM, JM NGOK <[email protected]> wrote: > RT is a BGP extra-community used to identify the VPN for the received > VPNv4 prefix. > > RD is not a BGP attribute. VPNv4 packet is the RD plus the IPv4 prefix. > > MP-BGP handles the control plane VPNv4 packets. > > Jean-Marie NGOK > Senior Network Engineer > 347 - 559 - 1172 > > ------------------------------ > *From:* Maureen Maina <[email protected]> > *To:* Keller Giacomarro <[email protected]> > *Cc:* CCIE ONLINE STUDY LIST <[email protected]> > *Sent:* Wednesday, August 15, 2012 8:05 AM > *Subject:* Re: [OSL | CCIE_RS] Route Target and VPN Label > > my understanding is that the RD is local to the router and as such can vary > for the same VPN on 2 different routers.The RT is carried with the route > like a tag to identify the routing table/vrf in which it goes. > Regards, > Mo > On Wed, Aug 15, 2012 at 7:55 AM, Keller Giacomarro <[email protected] > >wrote: > > > Without the RT, how would MP-BGP know which VRF to assign a VPN label to? > > > > Keller Giacomarro > > [email protected] > > > > > > On Tue, Aug 14, 2012 at 10:09 PM, Karan Sagar <[email protected]> > wrote: > > > Hi Everyone > > > > > > I'm finding it difficult to understand the role of Route target and VPN > > labels. > > > > > > Between the PE Routers there is a MP-BGP Session . The MP-BGP protocal > > > carries the Route Distinguisher to uniquely identify routes in the > > > MBGP route table > > > and Route Targets Extended Communtiy are used to determine which > > > interface to forward packets to based on the import and export > > > targets. > > > When there is a neighbor relationship between the CE and PE, Vpn > > > labels are also sent across the PE. The PE router forwards the packet > > > out an interface based on the VPN label. > > > > > > Is the RT required when the VPN label is used to forward packets ? > > > > > > Thanks, > > > Karan > > > _______________________________________________ > > > For more information regarding industry leading CCIE Lab training, > > please visit www.ipexpert.com > > > > > > Are you a CCNP or CCIE and looking for a job? Check out > > www.PlatinumPlacement.com <http://www.platinumplacement.com/> > > > > > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > > _______________________________________________ > > For more information regarding industry leading CCIE Lab training, please > > visit www.ipexpert.com > > > > Are you a CCNP or CCIE and looking for a job? Check out > > www.PlatinumPlacement.com > > > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
