Multicast Addresses

• low-order flag indicates permanent / transient group; three other flags reserved

• scope field: 1 - node local

  2 - link-local
  
  5 - site-local
  8 - organization-local
  B - community-local
  E - global
  (all other values reserved)

4

112 bits

8

group ID

scope

flags

11111111

4

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