Packets of multiple data flows on the same L2VPN carry the same VC labels, which are encapsulated on a PE. When these packets reach a P device, they can be forwarded only over one path.
To load-balance different data flows, configure flow-label-based load balancing on the PE. After you have completed the configuration, the PE encapsulates a data packet and adds a flow label following the PW label. The P device load-balances different data flows based on flow labels.
On the L2VPN shown in Figure 1 where two data flows exist:
Flow-label-based load balancing applies to an L2VPN on which multiple links exist between P devices.
Flow-label-based load balancing allows data flows on the same VPN to be load-balanced along different paths based on flow labels, improving resource usage.