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Routing Information Protocol (RIP)
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RIP operates using both active and passive devices.
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Active
devices, usually routers, broadcast RIP messages to all devices in
a network or subnetwork and update their internal routing tables
when they receive a RIP message.
■
Passive
devices, usually hosts, listen for RIP messages and update their
internal routing tables, but do not send RIP messages.
An active router sends a broadcast RIP message every 30 seconds. This
message contains the IP address and a metric (distance) from the router
to each destination in the routing table. In RIP, each router through which
a packet must travel to reach a destination counts as one network
hop .
Basic RIP Parameters RIP has several parameters to consider when you set up RIP to use in your
network. When you configure an IP interface, the module already has the
RIP parameters set to the defaults listed in Table 73.
RIP Mode The four available settings for RIP mode are as follows:
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Disabled — The Multilayer Switching Module ignores all incoming RIP
packets and does not generate any RIP packets of its own.
■
Learn — The Multilayer Switching Module processes all incoming RIP
packets, but it does not transmit RIP updates.
■
Advertise — The Multilayer Switching Module broadcasts RIP
updates, but it does not process incoming RIP packets.
■
Enabled — The Multilayer Switching Module broadcasts RIP updates
and processes incoming RIP packets.
Table 73 RIP Parameters
RIP Parameter Default Value
RIP Mode learn
Cost 1
Poison Reverse enabled
Advertisement Address limited broadcast address (255.255.255.255)