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Configuring Routing Information Protocol
RIP Configuration Task List
IPC-208
Cisco IOS IP Configuration Guide
Configuring Interpacket Delay
By default, the software adds no delay between packets in a multiple-packet RIP update being sent. If
you have a high-end router sending to a low-speed router, you might want to add such interpacket delay
to RIP updates, in the range of 8 to 50 milliseconds. To do so, use the following command in router
configuration mode:
Connecting RIP to a WAN
Routers are used on connection-oriented networks to allow potential connectivity to many remote
destinations. Circuits on the WAN are established on demand and are relinquished when the traffic
subsides. Depending on the application, the connection between any two sites for user data could be
short and relatively infrequent.
There are two problems using RIP to connect to a WAN:
• Periodic broadcasting by RIP generally prevents WAN circuits from being closed.
• Even on fixed, point-to-point links, the overhead of periodic RIP transmissions could seriously
interrupt normal data transfer because of the quantity of information that passes through the line
every 30 seconds.
To overcome these limitations, triggered extensions to RIP cause RIP to send information on the WAN
only when there has been an update to the routing database. Periodic update packets are suppressed over
the interface on which this feature is enabled. RIP routing traffic is reduced on point-to-point, serial
interfaces. Therefore, you can save money on an on-demand circuit for which you are charged for usage.
Triggered extensions to RIP partially support RFC 2091, Triggered Extensions to RIP to Support
Demand Circuits.
To enable triggered extensions to RIP, use the following commands in global configuration mode:
Command Purpose
Router(config-router)# output-delay delay
Adds interpacket delay for RIP updates sent.
Command Purpose
Step 1
Router(config)# interface serial controller-number
Configures a serial interface.
Step 2
Router(config-if)# ip rip triggered
Enables triggered extensions to RIP.