Your right Christophe, thank you for mentioning the allow-as in I total forget that option.
Great this is the power of group study! 2011/7/15 Christophe Lemaire <[email protected]> > Hi Abdel, > > > During my study I have understood that when the router peer with its > > neighbor it compare its own AS # with the neighbor AS# to decide whether > its > > IBGP or E-BGP neighbor. > > This is the case. R1 and R2 still see each other as eBGP neighbor. But > as you pointed out, when you use the local-as command, the router > prepends its real AS # by default. And as R1 and R2's real AS # are > the same, the BGP loop prevention enter in action: Routers refuse all > NLRI containing their own AS # in the AS_PATH. (You can see it with > "debup ip bgp updates"). > > Your workaround simply prevent the routers to prepend their real AS# > and to replace it by the fake AS# (or local-as). > > Another option could be to use "neighbor x.x.x.x allowas-in" command. > This disable the AS_PATH check for updates coming from that neighbor. > > Regards, > Christophe >
_______________________________________________ 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
