S9500 LPUs include ordinary LPUs (B/DB linecards) and enhanced LPUs (C/CA linecards), of which the enhanced LPU has MPLS process capacity while the ordinary LPU does not have MPLS process capacity. The port of an ordinary LPU can be used to CE side connection of MPLS VPN service, but it requires to configure proper ACL and its sub-rules on the ordinary, so as to redirect the specific VLAN packets received by the ordinary LPU port to the specified enhanced LPU port for label encapsulation. At this time, the enhanced LPU loops to the port and so the state is UP.
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