Module 15: IP Static Routing

Next-hop route

Only the next-hop IP address is specified

Directly connected static route

Only the router exit interface is specified.

Fully specified static route

The next-hop IP address and exit interface are specified

IPv4 Next-Hop Static Route

only the next-hop IP address is specified. The exit interface is derived from the next hop.

Fully specified static route

both the exit interface and the next-hop IP address are specified. This form of static route is used when the exit interface is a multi-access interface and it is necessary to explicitly identify the next hop.

Link-local addresses

are only unique on a given link or network.

Default Static Route

is a static route that matches all packets. A single default route represents any network that is not in the routing table.

Default Static Routes

are commonly used when connecting an edge router to a service provider network, or a stub router (a router with only one upstream neighbor router).

IPv4 Default Static Route

The command syntax for an IPv4 default static route is similar to any other IPv4 static route, except that the network address is 0.0.0.0 and the subnet mask is 0.0.0.0. The 0.0.0.0 0.0.0.0 in the route will match any network address.

IPv6 Default Static Route

The command syntax for an IPv6 default static route is similar to any other IPv6 static route, except that the ipv6-prefix/prefix-length is ::/0, which matches all routes.

show ip route static

command output to displays the contents of the static routes in the routing table. Note the asterisk (*) next to the route with code ‘S’.

Floating static routes

are static routes that are used to provide a backup path to a primary static or dynamic route. It is only used when the primary route is not available.

Host Route

is an IPv4 address with a 32-bit mask, or an IPv6 address with a 128-bit mask.

local host route

•Cisco IOS automatically installs a host route, also known as a ____________, when an interface address is configured on the router. It allows for a more efficient process for packets that are directed to the router itself, rather than for packet forwarding.

C

This is in addition to the connected route, designated with a _ in the routing table for the network address of the interface.

L

The local routes are marked with _ in the output of the routing table.

Static Host Routes

A host route can be a manually configured static route to direct traffic to a specific destination device.

IPv6 static routes

the next-hop address can be the link-local address of the adjacent router. However, you must specify an interface type and an interface number when using a link-local address as the next hop.