RIPv1 Fields

• Command

• • Request (1)
  • Response (2)

• Version: Always 1 for RIP v1

• Address Family: 2 for IP

• MBZ: “Must Be Zero”

• Route entries (0 to 25 per packet)

• • IP Address
  • • Address or network
    • 0.0.0.0 for default route
  • Metric
  • • Only can take on values 0-15; 16 indicates infinity
    • Almost always a hop count; range is too small for much else