The major problem you need to deal with here is that each time a client dials in, the Point-to-Point Protocol (PPP), which is the protocol used on the terminal server for connections to these dial-in users, installs a host route to the client's IP address in the routing table. If there is a network statement that includes that host route, it will be flooded to the entire area.
Likewise, when the client disconnects, the host route is removed from the routing table, and the removal of the route will need to be flooded to the rest of the routers in the area.
You have a couple different options for reducing flooding in an area caused by dial-in users:
• Make the terminal server an ABR
• Stop PPP from creating the host routes
• Advertise the dial-in clients off of a loopback interface
The sections that follow analyze each solution before arriving at a conclusion of which solution will work best for the network segment illustrated in Figure 5-6.
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