The packet is classified on input.
*UNLESS* you use table-label in a l3vpn, then it gets re-classified after the label POP. On 2/3/13 6:03 PM, Chris Kawchuk wrote: > It was my understanding that the label was "logically" popped on > Egress (in terms of how one would envision the packet flow); hence > the outer label EXP bits were evaluated by the BA classifier on > ingress properly. (Whether it's popped on ingress, yet evaluated > prior-to-pop is a mechanics thing..) > > But yes, I have no documentation I can point to; off the top of my > head that the above is indeed true. I would be interested to know for > future information sake that the JNPR box is indeed "doing the right > thing" so to speakā¦ i.e. since the PIC/MPC pops the Layer-2 > information as well, it needs to be able to read the 802.1P bits, if > there is a 1p-VLAN tag BA applied to the interface. Hopefully we're > also reading the outer EXP label at the same time; as this would make > sense. > > i.e. if you're doing VLAN pop/swapping, you'd need to retain any > BA-p-tag specific classification there as well, prior to any tag > manipulation. > > 400 quatloos says it's done on ingress before the label is popped. > > - Ck. > > >> >> Simple question I'm not able to find answer for: what is the order >> of label pop operation and BA classification on penultimate router >> ? >> >> I have a gut feeling that label is stripped first and then BA >> classification is done on a "naked" packet, f.e., ipprec-based in >> case of IP packet, without taking (already stripped) EXP bits into >> account, but I can't find any documentation proving or disproving >> it... > > > _______________________________________________ juniper-nsp mailing > list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > -- ------------------------------------------------------------------------ Christopher E. Brown <chris.br...@acsalaska.net> desk (907) 550-8393 cell (907) 632-8492 IP Engineer - ACS ------------------------------------------------------------------------ _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp