Routing Information Filters

Routing information filters restrict the exchange of routing information between routers by limiting the routes added to the routing tables of specified routers. These filters increase network security by limiting the visibility of specified networks. However, like service information filters, routing information filters provide a low level of network security because they only monitor routing information packets. They also reduce the network traffic caused by the periodic exchange of routing information messages between routers.

Routing information filters are available for IPX, AppleTalk, and TCP/IP.

There are two types of routing information filters:

• Outgoing routing information filters, which limit the route advertisements sent out by a router to a specified set of routers
• Incoming routing information filters, which limit the acceptance of route advertisements received by the router from its neighboring routers

For more information about routing information filters, refer to

• Outgoing Routing Information Filters
• Incoming Routing Information Filters