ATM cell mode

• Ingress performs no reassembly

• Control word is optional:

  • Length may be used to infer number of cells
  • Flags set to zero

Tunnel

label

VC

label

4 octets

4 octets

Control

word

ATM cell #1

minus HCS

4 octets

Rsvd

bits

4

Length

8

Sequence Number

16

Control Word

Flags

4

52 octets

ATM cell #2

minus HCS

52 octets

…

ATM cells over MPLS

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