Is MPLS layer 2.5 protocol

Posted: February 9, 2016 in MPLS

Simple answer is no as there is no layer 2.5 defined in standards but still we call MPLS as layer 2.5 protocol

1. MPLS label resides in front of layer 3 header and before layer 2 header
2. MPLS label are derived from IP routing table so we can say it is derived from layer 3 information but  if we observe label swapping behavior is same like Ethernet header changes on every layer 3 hop

Benefits of MPLS

1. BGP free core
2. L2 and L3 MPLS vpn
3. MPLS traffic engg

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