300-515 · Question #124
In an L3VPN, how does a PE initially forward a packet it receives from a CE through the service provider network?
The correct answer is C. by binding it with a label that it receives from the destination PE. In an MPLS L3VPN, each PE learns per-prefix VPN labels via MP-BGP from the remote PE. When a CE’s packet arrives, the local PE looks up the destination in its VRF, pushes the VPN label it learned from that remote PE, and then pushes (or swaps) any transport/LDP label to steer the
Question
In an L3VPN, how does a PE initially forward a packet it receives from a CE through the service provider network?
Options
- Aby binding it with a label that it receives from the destination CE
- Bby binding it with a route target export assigned by the network administrator
- Cby binding it with a label that it receives from the destination PE
- Dby binding it with a route target import assigned by the network administrator
How the community answered
(31 responses)- A6% (2)
- B3% (1)
- C90% (28)
Explanation
In an MPLS L3VPN, each PE learns per-prefix VPN labels via MP-BGP from the remote PE. When a CE’s packet arrives, the local PE looks up the destination in its VRF, pushes the VPN label it learned from that remote PE, and then pushes (or swaps) any transport/LDP label to steer the packet through the SP core.
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