RIP Off for TCP/IP
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Posted: 29 Aug 2002
What is RIP?
RIP (TCP/IP) is a distance vector internal gateway protocol for TCP/IP networks.
A TCP/IP Routing Information Protocol (RIP) router periodically broadcasts a routing update message that contains an entry for each network it can reach and the cost (distance) to that network. TCP/IP RIP routers listen to all TCP/IP RIP broadcast messages.
Each entry in a received routing update message is added to the routing table. The router that sent the routing update message is remembered as the next router (hop) on the route to the network in the entry.
If a router learns about two routes to a network, it keeps the one with the lower cost. Cost is defined in RIP in terms of hop count, or the number of routers along the path to the destination. TCP/IP RIP allows a maximum cost (hop count) of 15.
Once a route is learned, it must be refreshed at certain intervals. This is done to ensure that the route is still valid. TCP/IP RIP routers normally broadcast a routing update message containing known routes once every 30 seconds.
A timer is started when a route is learned from a routing update message. If a subsequent routing update message does not refresh the route within 180 seconds, the route is assumed to be unusable because of a network or node failure. The route is removed from the routing table.
Turning it Off
Since RIP and OSPF are route discovery protocols, they are rarely necessary for a NetWare/NBM implementation. Static routing is inherently more efficient. Disabling RIP and OSPF reduces overhead on the CPU and on the wire, and is a good basic optimization step. Only use them if your network topology and routing design is so complex that static routing actually becomes more difficult to manage than discovery protocols.
How to turn RIP off for TCP/IP using the AUTOEXEC.NCF
Load TCPIP RIP=OFF
1. PROTOCOLS | TCPIP
2. Set RIP to DISABLED
3. ESC, UPDATE, REINITIALIZE SYSTEM
Network Interface Level
1. BINDINGS - highlight and hit Enter on the TCPIP binding.
2. RIP BIND OPTIONS
4. ESC, UPDATE, REINITIALIZE SYSTEM
For more info see TID 10062006.
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