Default Route

• Special case summary that matches everything

• We’ve added default route to RIP

  • network number -2
  • RIP router: if deist not reachable, but -2 is reachable, route towards -2

• NLSP has several ways of doing default:
  • LSP says “I am a level 2 router”
  • destination -2
  • zero length prefix

R1

R2

R3

R4

backbone

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