What is the relationship between a Forwarding Equivalence Class (FEC) and the MPLS
label that a Label Switching Router (LSR) advertises for that FEC?
A.
An LSR assigns the same label to FECs with the same best next hop: labels remain
constant across the MPLS domain
B.
The LSR assigns a unique label to each FEC, but labels assigned by different LSRs do
not necessarily match.
C.
The LSR assigns a unique label to each FEC. and that label remains constant across the
MPLS domain
D.
An LSR assigns the same label to FECs with the same best next hop; labels assigned by
different LSRs do not necessarily match
answer D
any one can confirm ?
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B as per below:
MPLS labels are locally significant. That means that the label is only meaningful to
the next hop LSR. No end to end single label value is assigned to a FEC. The
label typically changes on a per hop basis and is different between each router
hop. It is possible that a next hop LSR allocates the same label randomly to the
same FEC. This occurrence of both ingress and egress label being the same is a
random event and should not be expected. Labels typically change on a per hop
basis per FEC.
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correct.
the b is correct answer.
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