routing commands

show ip route

Displays the entire IPv4 routing table, looking for C (Connected), L (Local), S (Static), and O (OSPF).

show ipv6 route

Displays the IPv6 routing table.

show ip route [ip_address]

Shows the specific path the router will use to reach a given destination IP.

show ip protocols

Displays parameters, timers, and states of any active IPv4 routing protocols (like OSPF).

ip route [destination_network] [subnet_mask] [next_hop_ip OR exit_interface]

Command syntax for a Standard Network Route.

ip route [destination_host_ip] 255.255.255.255 [next_hop_ip]

Command syntax for a Host Route.

ip route 0.0.0.0 0.0.0.0 [next_hop_ip OR exit_interface]

Command syntax for a Default Route.

ip route [destination_network] [subnet_mask] [next_hop_ip] [administrative_distance]

Syntax for a Floating Static Route, used for backup routes.

ipv6 unicast-routing

Command to enable IPv6 routing in global config mode before any IPv6 routing works.

ipv6 route [ipv6_network/prefix_length] [next_hop_ipv6]

Command syntax for a Standard IPv6 Route.

ipv6 route ::/0 [next_hop_ipv6 OR exit_interface]

Command syntax for an IPv6 Default Route.

router ospf [process_id]

Command to start the OSPF process; process ID is locally significant.

router-id [ipv4_address]

Command to set the Router ID for OSPF.

network [network_address] [wildcard_mask] area 0

Method 1 to enable OSPF in global config mode.

ip ospf [process_id] area 0

Method 2 to enable OSPF directly inside interface configuration mode.

passive-interface [interface_id]

Command to stop OSPF hellos from being sent out on specified interfaces.

default-information originate

Command to tell OSPF to advertise the router's static default route.

auto-cost reference-bandwidth [megabits_per_second]

Command to adjust OSPF's reference bandwidth.

show ip ospf neighbor

Command to verify if the router has formed an adjacency with other OSPF routers, looking for the 'FULL' state.

show ip ospf interface brief

Command to show a summary of all interfaces running OSPF, including process ID, area, and link cost.

show ip protocols

Command to verify the OSPF process ID, Router ID, and advertised networks.