MPLS ConceptsLabels

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Label

EXP

S

TTL

Label = 20 bitsEXP = Experimental bits, 3 bitsS = Bottom of Stack, 1 bitTTL = Time to Live, 8 bits

• Generic: can be used over Ethernet, 802.3, PPP links, Frame Relay, ATM PVCs, etc.

• Uses new Ethertypes / PPP PIDs / SNAP values etc.:

  • Different Ethertypes for unicast and multicast

• 4 octets (per label)

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