CCIE RS – Routing Concepts – Implement and Troubleshoot Default Routing

Implement and Troubleshoot Default Routing

Ip route 0.0.0.0 0.0.0.0 [next-hop ip]

  • Not dependent on any routing protocol
  • Ip routing must be enabled
  • Sharing default route with EIGRP
    • Route must be redistributed into EIGRP to be shared
  • RIP
    • Route must be redistributed into RIP to be shared

Ip default-gateway

  • Only used when ip routing is DISABLED on the router
  • Router acting as a host in IP world

Ip default-network

  • Can be used when ip routing is enabled
  • Installed as gateway of last resort
  • Independent of any routing protocol
  • Gateway of last report in dynamic routing protocols
    • EIGRP
      • Must be a EIGRP derived network in the routing table or the static redistributed into EIGRP
      • Network command
    • RIP
      • Advertises a to 0.0.0.0 if gateway of last resort is selected
      • Does not need to be explicitly advertised under the RIP process
    • OSPF
      • Not propagated in OSPF
      • OSPF has it’s own process for injecting a default route
    • ISIS
      • Not propagated in ISIS

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