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Example: Configuring Interprovider Layer 3 VPN Option A
We know that Inter provider Layer 3 VPN Option A provides inter provider VRF-to-VRF connections at the AS boundary routers (ASBRs) , which means that traffic between ASBRs will be in IPv4 format and no need to enable MPLS on Interfaces connected between ASBRs like option A and C .
why in this example MPLS enabled on the interfaces connected between ASBRs ?