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This chapter describes the function and displays the syntax for Routing Information Protocol (RIP) commands. For more information about defaults and usage guidelines, see the corresponding chapter of the Network Protocols Command Reference, Part 1.
To restore the default behavior of automatic summarization of subnet routes into network-level routes, use the auto-summary router configuration command. To disable this feature and transmit subprefix routing information across classful network boundaries, use the no form of this command.
auto-summaryTo generate a default route into RIP, use the default-information originate router configuration command. To disable this feature, use the no form of this command.
default-information originate [route-map mapname]| route-map mapname | (Optional) Routing process will generate the default route if the route map is satisfied. |
To set default metric values for RIP, use this form of the default-metric router configuration command. To return to the default state, use the no form of this command.
default-metric number| number | Default metric value. |
To enable authentication for RIP Version 2 packets and to specify the set of keys that can be used on an interface, use the ip rip authentication key-chain interface configuration command. Use the no form of this command to prevent authentication.
ip rip authentication key-chain name-of-chain| name-of-chain | Enables authentication and specifies the group of keys that are valid. |
To specify the type of authentication used in RIP Version 2 packets, use the ip rip authentication mode interface configuration command. Use the no form of this command to restore clear text authentication.
ip rip authentication mode {text | md5}| text | Clear text authentication. |
| md5 | Keyed MD5 authentication. |
To specify a RIP version to receive on an interface basis, use the ip rip receive version interface configuration command. Use the no form of this command to follow the global version rules.
ip rip receive version [1] [2]| 1 | (Optional) Accepts only RIP Version 1 packets on the interface. |
| 2 | (Optional) Accepts only RIP Version 2 packets on the interface. |
To specify a RIP version to send on an interface basis, use the ip rip send version interface configuration command. Use the no form of this command to follow the global version rules.
ip rip send version [1] [2]| 1 | (Optional) Sends only RIP Version 1 packets out the interface. |
| 2 | (Optional) Sends only RIP Version 2 packets out the interface. |
To enable the split horizon mechanism, use the ip split-horizon interface configuration command. To disable the split horizon mechanism, use the no form of this command.
ip split-horizonTo define a neighboring router with which to exchange routing information, use this form of the neighbor router configuration command. To remove an entry, use the no form of this command.
neighbor ip-address| ip-address | IP address of a peer router with which routing information will be exchanged. |
To specify a list of networks for the Routing Information Protocol (RIP) routing process, use this form of the network router configuration command. To remove an entry, use the no form of this command.
network network-number| network-number | IP address of the network of directly connected networks. |
To add an offset to incoming and outgoing metrics to routes learned via RIP, use the offset-list router configuration command. To remove an offset list, use the no form of this command.
offset-list {access-list-number | name} {in | out} offset [type number]| access-list-number | name | Standard access list number or name to be applied. Access list number 0 indicates all access lists. If offset is 0, no action is taken. For IGRP, the offset is added to the delay component only. |
| in | Applies the access list to incoming metrics. |
| out | Applies the access list to outgoing metrics. |
| offset | Positive offset to be applied to metrics for networks matching the access list. If the offset is 0, no action is taken. |
| type | (Optional) Interface type to which the offset-list is applied. |
| number | (Optional) Interface number to which the offset-list is applied. |
To change the interpacket delay for RIP updates sent, use the output-delay router configuration command. To remove the delay, use the no form of this command.
output-delay delay| delay | Delay, in milliseconds, between packets in a multiple-packet RIP update. The range is 8 to 50 milliseconds. The default is no delay. |
To configure the Routing Information Protocol (RIP) routing process, use the router rip global configuration command. To turn off the RIP routing process, use the no form of this command.
router ripTo adjust RIP network timers, use the timers basic router configuration command. To restore the default timers, use the no form of this command.
timers basic update invalid holddown flush| update | Rate in seconds at which updates are sent. This is the fundamental timing parameter of the routing protocol. The default is 30 seconds. |
| invalid | Interval of time in seconds after which a route is declared invalid; it should be at least three times the value of update. A route becomes invalid when there is an absence of updates that refresh the route. The route then enters holddown. The route is marked inaccessible and advertised as unreachable. However, the route is still used for forwarding packets. The default is 180 seconds. |
| holddown | Interval in seconds during which routing information regarding better paths is suppressed. It should be at least three times the value of update. A route enters into a holddown state when an update packet is received that indicates the route is unreachable. The route is marked inaccessible and advertised as unreachable. However, the route is still used for forwarding packets. When holddown expires, routes advertised by other sources are accepted and the route is no longer inaccessible. The default is 180 seconds. |
| flush | Amount of time in seconds that must pass before the route is removed from the routing table; the interval specified should be greater than the invalid value. If it is less than this sum, the proper holddown interval cannot elapse, which results in a new route being accepted before the holddown interval expires. The default is 240 seconds. |
To have the Cisco IOS software validate the source IP address of incoming routing updates for RIP and IGRP routing protocols, use the validate-update-source router configuration command. To disable this function, use the no form of this command.
validate-update-sourceTo specify a RIP version used globally by the router, use the version router configuration command. Use the no form of this command to restore the default value.
version {1 | 2}| 1 | Specifies RIP Version 1. |
| 2 | Specifies RIP Version 2. |
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