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1. Static Routing Implementation

1.1 Static Routing

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.

Dynamic VS Static Routing

Static routing has three primary uses:

•  Providing ease of routing table maintenance in smaller networks that are not expected to grow significantly.
•  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.

1.2 Types of Static Routes

•  Standard static route
•  Default static route
•  Summary static route
•  Floating static route

Standard static Routes: connect a specific remote network.

Default static routes are used:

•  When no other routes in the routing table match the packet destination IP address. In other words, when a more specific match does not exist. A common use is when connecting a company‘s edge router to the ISP network.
•  When a router has only one other router to which it is connected. This condition is known as a stub router.

To reduce the number of routing table entries, multiple static routes can be summarized into a single static route if:

•    The destination networks are contiguous and can be summarized into a single network address.
•    The multiple static routes all use the same exit interface or next-hop IP address.

Floating static routes are static routes that are used to provide a backup path to a primary static or dynamic route, in the event of a link failure.

The floating static route is only used when the primary route is not available.

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原文地址：http://www.cnblogs.com/elewei/p/4629881.html