Assume that the PEs are separated by Multiple P routers.
How many labels should the ingress PE push for BPE functionality?

A.
1

B.
None

C.
3

D.
2

E.
It depends on the numbers of hops between the ingress and egress PE.

Explanation:
A PE device on receiving the IPv6 prefix from CE by routing protocol will assign a label and
advertise through BGP to other PE devices which in turn will be advertised to remote CE devices.
This label information will be used to switch the p
acket through MPLS cloud. 6PE implementation will have minimum 2 labels imposed, top label
being the one to identify the remote PE while bottom label to identify the IPv6 prefix.