Static routing

General information on “Static route”:

• A static route is a manually configured route not learned dynamically by a routing protocol
• The target of the default route should be the next-hop IP address (exit-interface only is possible but not recommended)
• If the next-hop is an IPv6 link-local address, then a exit-interface is mandatory
• By default, the AD for a statically configured route is 1 but can be changed

Static route types:

• “Standard” static route: A manually configured route used to reach a network.
• “Default” static route: Target network is 0.0.0.0/0 (IPv4) or ::/0 (IPv6).
• “Floating” static route: A manually configured BACKUP route used to reach a network. Configured when a routing protocol is used as well. AD should be set +1 than the AD of the routing protocol.
• “Summary” static route: Used when several target networks are contiguous. Instead of creating four separate routes to 172.16.0.0/24, 172.16.1.0/24, 172.16.2.0/24, 172.16.3.0/24 a single route of 172.16.0.0/22 can be created.

“Static Routing” CLI configuration commands:

## Configuring a static IPv4 route
Router(config)# ip route <network> <mask> [<next-hop-ip> |<exit-if>] [<ad>]

## Configuring a static IPv6 route
Router(config)# ipv6 route <network> [<next-hop-ip> | <exit-if>][<ad>]

“Static Routing” CLI show commands:

## Showing configured static IPv4 routes
Router# show ip static-route

## Showing configured static IPv6 routes
Router# show ipv6 static-route