RIP is a true distance vector routing protocol. It sends the complete routing table out to all other active interfaces every 30 seconds. RIP uses Hop Count as it's only metric. The maximum number of hops in a RIP network is 15, one hop is a directly connected network, and 16 hops is an unreachable network.
RIP v1 uses only classful routing. RIP v2 uses classless routing.
RIP uses three different kinds of timers to regulate its performance:
Route Update timer sets the interval (30 seconds) between periodic routing updates in which the routers sends a complete copy of its routing table out to all neighbors.
Route Invalid timer determines the length of time that must expire (90 seconds) before a router determines that a route has become invalid.
Router Flush timer sets that time between a route becoming invalid and its remove from the routing table (240 seconds).
RIP Configurations
RIP is very simple to configure. All you need to do is enable RIP and add each network that uses RIP. However, RIPv2 has a few more possible commands; you can use two of them: version and no auto-summary.
Because the router will by default use RIPv1, you must use the version command to tell the router to use RIPv2. In addition, by default RIPv2 will summarize major networks across boundaries. Use the no auto-summary command to stop summarization.
RIPv1 Configuration Example
Router A (config)#router rip
Router A (config_router)#network 208.28.3.0
Router A (config_router)#network 192.38.56.0
Router B (config)#router rip
Router B (config-router)#network 134.80.0.0
Router B (config-router)#network 192.38.56.0
Router B (config-router)#network 192.38.57.0
Router B (config-router)#network 192.38.58.0
Router C (config)#router rip
Router C (config-router)#network 192.38.58.0
Router C (config-router)#network 208.28.1.0
Router D (config)#router rip
Router D (config-router)#network 192.38.57.0
Router D (config-router)#network 208.28.2.0
Monitoring and Verifying RIP
Command Description
Show ip protocols Shows the entire routing table
Show ip route Shows routing protocol parameters and current timer values
Debug ip rip Issues log message for each RIP update
Ping Sends and receive ICMP echo messages to verify connectivity
Trace Sends a series of ICMP echoes with increasing TTL value
RIP v1 uses only classful routing. RIP v2 uses classless routing.
RIP uses three different kinds of timers to regulate its performance:
Route Update timer sets the interval (30 seconds) between periodic routing updates in which the routers sends a complete copy of its routing table out to all neighbors.
Route Invalid timer determines the length of time that must expire (90 seconds) before a router determines that a route has become invalid.
Router Flush timer sets that time between a route becoming invalid and its remove from the routing table (240 seconds).
RIP Configurations
RIP is very simple to configure. All you need to do is enable RIP and add each network that uses RIP. However, RIPv2 has a few more possible commands; you can use two of them: version and no auto-summary.
Because the router will by default use RIPv1, you must use the version command to tell the router to use RIPv2. In addition, by default RIPv2 will summarize major networks across boundaries. Use the no auto-summary command to stop summarization.
RIPv1 Configuration Example
Router A (config)#router rip
Router A (config_router)#network 208.28.3.0
Router A (config_router)#network 192.38.56.0
Router B (config)#router rip
Router B (config-router)#network 134.80.0.0
Router B (config-router)#network 192.38.56.0
Router B (config-router)#network 192.38.57.0
Router B (config-router)#network 192.38.58.0
Router C (config)#router rip
Router C (config-router)#network 192.38.58.0
Router C (config-router)#network 208.28.1.0
Router D (config)#router rip
Router D (config-router)#network 192.38.57.0
Router D (config-router)#network 208.28.2.0
Monitoring and Verifying RIP
Command Description
Show ip protocols Shows the entire routing table
Show ip route Shows routing protocol parameters and current timer values
Debug ip rip Issues log message for each RIP update
Ping Sends and receive ICMP echo messages to verify connectivity
Trace Sends a series of ICMP echoes with increasing TTL value
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