Module 14.1_Static Routing

Manually,
Dynamically

A router can learn about remote networks in one of two ways

Manually

Remote networks are manually entered into the route table using static routes.

Dynamically

Remote routes are automatically learned using a dynamic routing protocol.

Providing ease of routing table maintenance in smaller networks
Routing to and from stub networks,
Using a single default route to represent a path to any network that does not have a more specific match with another route in the routing table

Static routing has three primary uses

stub network

is a network accessed by a single route, and the router has no other neighbors.

Connect to a specific network.

Provide a Gateway of Last Resort for a stub network.

Reduce the number of routes advertised by summarizing several contiguous networks as one static route.

Create a backup route in case a primary route link fails.

Static Route Applications/Static Routes are often used to (4)

Default Static Route,

Floating Static Route

Types of Static Routes

default static route

• is a route that matches all packets.

• is simply a static route with 0.0.0.0/0 as the destination IPv4 address.

default route

identifies the gateway IP address to which the router sends all IP packets that it does not have a learned or static route.

next hop

can be identified by an IP address, exit interface, or both.

Next-hop route,

Directly connected static route,

Fully specified static route

How the destination is specified creates one of the three following route types:

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.

Next-hop static IPv6 route

Only the next-hop IPv6 address is specified

Fully specified static IPv6 route

The next-hop IPv6 address and exit interface are specified

show ipv6 route,

show ipv6 route static,

show ipv6 route network

3 commands to verify static routes

Floating static routes

have an administrative distance greater than the administrative distance of another static route or dynamic routes.

Floating static routes

• The static route “floats” and is not used when the route with the better administrative distance is active.

• If the preferred route is lost the ____ can take over.

Use the show ip route command to verify that the routing table is using the default static route.

Use the traceroute command to follow the traffic flow out the primary route.

Disconnect the link or shutdown the primary interface(s).

Use a show ip route command to verify that the routing table is using the floating static route.

Use a traceroute command to follow the traffic flow out the backup route.

To test a floating static route (5)