My quesation are realted to MPLS and are as follws:-
1-> Between the Pe Routers there is a MP-BGP Session . The MP-BGP protocal carries the VPNV4 routes in the Extended Communtiy. Now between the P routers there is Label Swapping done. But along with the Local Label and the next hop label there is a Vpn Label also being attached to the packet. Now what is that VPN Label for?
2---> Secondly if someone says that it is used for identifying the VPN or the VRF at the Egress PE Router then what does RT does. Coz as far as I know that it is the RT which identifies the VRF or the VPN at the Egress Router. So wat does this VPN Lable is used for?
3--> Thirdly what is the difference between the Penultimate Hop Popping Tag (PHP) tag and Untagged Tag.