Routing flow and packet flow

• For networks in AS1 and AS2 to communicate:

  • AS1 must announce routes to AS2
  • AS2 must accept routes from AS1
  • AS2 must announce routes to AS1
  • AS1 must accept routes from AS2

accept

announce

announce

accept

AS 1

AS2

packet flow

packet flow

Routing flow

egress

ingress

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