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