Archive for the ‘MPLS’ Category

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


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

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