RIP

RIP (Routing Information Protocol) is a widely used protocol for managing router information within a self-contained network such as a corporate local area network or an interconnected group of such LANs. is classified by the IETF (Internet Engineering Task Force) as one of several internal gateway protocols.

RIP sends routing-update messages at regular intervals and when the network topology changes. When a router receives a routing update that includes changes to an entry, it updates its routing table to reflect the new route. The metric value for the path is increased by 1, and the sender is indicated as the next hop. RIP routers maintain only the best route (the route with the lowest metric value) to a destination. After updating its routing table, the router immediately begins transmitting routing updates to inform other network routers about the change. These updates are sent independently of the regularly scheduled updates that RIP routers send. RIP uses a hop count to determine network distance. Each host with a router in the network uses the routing table information to determine the next host to route a packet for a specified destination.

auto-summary
To enable auto summarization feature in RIP, enable or disable the auto summarization of routes in RIP, and restore the default behavior of automatic summarization of subnet routes into network-level routes, use the command auto-summary in RIP Router Configuration Mode.
debug ip rip
To set the debug level for RIP module, use the command debug ip rip in Privileged EXEC Mode. The no form of the command resets the debug level for RIP module. This command allows combination of debug levels to be configured (that is, more than one level of trace can be enabled or disabled). The debug levels are configured one after the other and not in single execution of the command.
default-information
To set the metric to be used for default route propagated over the interface, use the command default-information in Interface Configuration Mode. The no form of the command disables the origination of default route over the interface. The administrative distance can be enabled for one route map only. If distance needs to be enabled for a route map, then distance should be disabled for an already assigned route map. This command is a standardized implementation of the existing command: ip rip default route originate. It operates similar to the existing command.
default-metric
To set the default metric values to be used for redistributed routes for RIP, use the command default-metric in RIP Router Configuration Mode. The command is used in conjunction with the redistribute router command to cause the current routing protocol to use the same metric value for all redistributed routes. The no form of the command sets the metric used with redistributed routes to its default value. The metric value given in the no form of the command will be ignored during the execution of the command.
distance
To enable the administrative distance (that is, the metric to reach destination) of the routing protocol and set the administrative distance value, use the command distance in RIP Router Configuration Mode. The no form of this command disables the administrative distance.
distribute-list
To enable route map filtering for inbound or outbound routes and define the conditions for distributing the routes from one routing protocol to another, use the command distribute-list in RIP Router Configuration Mode. The no form of the command disables route map filtering for inbound or outbound routes.
ip rip
For RIP- related configuration, use the command ip rip in VLAN Interface Configuration Mode. The no form of this command deletes the RIP related configuration or sets all configured values to default.
ip rip
To configure the security level of the RIP in the system to accept / ignore RIPv1 packets when authentication is in use and determine the retransmission timeout interval and number of retries to retransmit the update request packet or an unacknowledged update response packet, use the command ip rip in RIP Router Configuration Mode. The no form of the command resets the security level, retransmission timeout interval, or the number of retransmission retries to their default values.
ip split-horizon
To enable the split horizon updates for the RIP, which prevents the routing loops in distance routing protocol, by prohibiting the router from advertising a route back onto the interface, use the command ip split-horizon in VLAN Interface Configuration Mode.
neighbor
To add a trusted neighbor router with which routing information can be exchanged and from which RIP packets can be accepted, use the command neighbor in RIP Router Configuration Mode. This command permits the point-to-point (nonbroadcast) exchange of routing information. When used in combination with the passive-interface vlan, router configuration command, routing information can be exchanged between a subset of routers an access servers. On a LAN, multiple neighbor commands can be used to specify additional neighbors or peers. The no form of the command deletes a trusted neighbor router.
network
To enable RIP on a primary IP network or a secondary IP network or an unnumbered VLAN interface / router port, use the command network in RIP Router Configuration Mode. It configures a list of networks for the RIP routing process. RIP routing updates will be sent and received only through the specified interfaces on this network. If an interface's network is not specified, then the network will not be advertised in any RIP update. This should be configurable for Primary and Secondary IP address. The no form of the command disables RIP on a primary IP network or a secondary IP network or an unnumbered VLAN interface / router port
output-delay
To enable interpacket delay for RIP updates, where the delay is in milliseconds between packets in a multiple-packet RIP update, use the command output-delay in RIP Router Configuration Mode. This interpacket delay feature helps in preventing the routing table from losing information due to flow of RIP update from a high speed router to la ow speed router. The no form of the command disables interpacket delay for RIP updates.
passive-interface
To suppress the RIP routing updates on a specified VLAN interface in a defined L2 switch context / default context or on a specified router port, use the command passive-interface in RIP Router Configuration Mode. It denotes that the RIP process runs in a passive VLAN interface / passive router port. If the sending of routing updates is disabled on an interface, the particular subnet will continue to be advertised to other interfaces, and updates from other routers on that interface continue to be received and processed. The no form of the command restricts suppressing of RIP routing updates from an interface.
redistribute
To enable RIP to participate in route redistribution, use the command redistribute in RIP Router Configuration Mode. When enabled, RIP starts advertising the routes learned by other protocols. The no form of the command disables RIP to participate in route redistribution. When disabled, RIP will stop redistribution of routes but will continue to send updates to the RTM.
rip
To set the flag to decide whether the last authentication key on expiry should have its lifetime as infinite or not, use the command rip in Global Configuration Mode.
router rip
To enable RIP and enter the Router Configuration mode, use the command router rip in Global Configuration Mode. The no form of the command disables RIP.
show ip rip
To display the IP RIP database, statistics, authentication, use the show ip rip command in Privileged EXEC Mode.
timers basic
To configures update, route age and garbage collection timers for the VLAN interface / router port, use the command timers basic in Interface Configuration Mode.
version
To set the global version of RIP, use the command version in RIP Router Configuration Mode. The command is used in conjunction with the redistribute router command to cause the current routing protocol to use the same metric value for all redistributed routes. The no form of the command sets the RIP global version to its default value. This command is a complete standardized implementation of the existing commands and operates similarly to that of the commands ip rip send version and ip rip receive version.