Rip Policies; Rip Import Policies; Rip Export Policies - 3Com 4007 Implementation Manual

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RIP Policies

Each router maintains a table of current routing information (the routing

table). The routing protocols receive or advertise routes from the

network. RIP policies control the flow of routing information among the

network, the protocols, and the routing table manager.

Routing policies allow you to define:

The import policies that specify which routes the router places into the

routing table.

The export policies that specify the routes that the router propagates

to the network.

Import/export policies for each peer.

Before the router adds a route to the routing table, it follows these steps:

The protocol receiving the route forwards the route to the routing

table manager.

The routing table manager compares the route to the import policy to

determine whether to accept or drop the route.

If the routing table manager accepts the route, it stores the route in

the routing table.

The default import policy is none; that is, the router places all routes into

the routing table.

At certain times, such as when the routing table changes, the protocol

asks the routing table manager for routes to advertise to other routers.

The routing table manager follows these steps:

It compares the route to the export policy to determine whether to

advertise the route to the network.

If it accepts the route, the manager propagates it to the network.

The default import policy is none; that is, the router advertises all routes

in the routing table.

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