What is the second level label of a mpls packet?

i thought it was the RT or RD,but i can not associate the MBGP atrribute with the mpls label,confused,
please help me!
recommending a related book would be helpful
thanks

Devang, IGP label(1st label) is required to label switch the path till the IBGP nexthop (which is other PE's advertising the VPN routes).Once it packet reaches the egress PE it has to find the right VRF to which the route belongs and then find the right outgoing interface. So from MPLS perspective it assigns a second label which is the mapping of VPN routes to label value. And as per this label (second label it identifies the right VPN). Without the second label there is no mapping to identify which VPN the packet belongs to.
Its more of the control plane and forwarding plane thing. When BGP sends the update it sends it with RT RD and VPN label to be used.
But when the packet from the customer side(data traffic) arrives that packet in its L3header only has a destination IP. No RD or RT so how would the PE's take the forwarding decision for that packet, so for that purpose the second label which was assigned as the part of control plane for a destination route (where in the routes's RD and RT values were known) is used.
So to conclude when forwarding packets there is no RD or RT information, its just labels which have been assigned when the packet entered the MPLS cloud.(1st label the IGP label for the BGP nexhop, and the second label (VPN label for the VPN prefix) to identify the right VPN for that packet.
HTH-Cheers,
Swaroop

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What is the second level label of a mpls packet?

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