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This chapter explains the function and syntax of the Routing Information Protocol (RIP) commands. For more information about defaults and usage guidelines, see the corresponding chapter of the
Cisco IOS IP and IP Routing Command Reference, Release 12.1.
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 function and send subprefix routing information across classful network boundaries, use the no form of this command.
auto-summarySyntax Description
This command has no arguments or keywords.
To generate a default route into Routing Information Protocol (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]
Syntax Description
route-map mapname (Optional) Routing process will generate the default route if the route map is satisfied.
To set default metric values for Routing Information Protocol (RIP), use the default-metric router configuration command. To return to the default state, use the no form of this command.
default-metric number
Syntax Description
number Default metric value.
Syntax Description
name-of-chain Enables authentication and specifies the group of keys that are valid.
Syntax Description
text Clear text authentication. md5 Keyed MD5 authentication.
To specify a Routing Information Protocol (RIP) version to receive on an interface basis, use the ip rip receive version interface configuration command. To follow the global version rules, use the no form of this command.
ip rip receive version [1] [2]
Syntax Description
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 Routing Information Protocol (RIP) version to send on an interface basis, use the ip rip send version interface configuration command. To follow the global version rules, use the no form of this command.
ip rip send version [1] [2]
Syntax Description
1 (Optional) Sends only RIP Version 1 packets out the interface. 2 (Optional) Sends only RIP Version 2 packets out the interface.
To enable triggered extensions to Routing Information Protocol (RIP), use the ip rip triggered interface configuration command. To disable triggered extensions to RIP, use the no form of this command.
ip rip triggeredSyntax Description
This command has no arguments or keywords.
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-horizonSyntax Description
This command has no arguments or keywords.
To configure a Cisco router running Routing Information Protocol (RIP) to advertise a summarized local IP address pool on a network access server so that the address pool can be provided to dialup clients and specify the IP address and network mask that identify the routes to be summarized, use the ip summary-address rip router configuration command. To disable the split horizon mechanism, use the no form of this command.
ip summary-address rip ip-address ip-network-mask
Syntax Description
ip-address IP address to be summarized. ip-network-mask IP network mask that drives route summarization for the specified IP address.
To define a neighboring router with which to exchange routing information, use the neighbor router configuration command. To remove an entry, use the no form of this command.
neighbor ip-address
Syntax Description
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 the network router configuration command. To remove an entry, use the no form of this command.
network network-number
Syntax Description
network-number IP address of the network of directly connected networks.
To add an offset to incoming and outgoing metrics to routes learned via Routing Information Protocol (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]
Syntax Description
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 Routing Information Protocol (RIP) updates sent, use the output-delay router configuration command. To remove the delay, use the no form of this command.
output-delay delay
Syntax Description
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 ripSyntax Description
This command has no arguments or keywords.
To display summary address entries in the Routing Information Protocol (RIP) routing database entries if there are relevant routes being summarized based upon a summary address, use the show ip rip database EXEC command.
show ip rip databaseSyntax Description
This command has no arguments or keywords.
To 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
Syntax Description
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 Routing Information Protocol (RIP) and Interior Gateway Routing Protocol (IGRP) routing protocols, use the validate-update-source router configuration command. To disable this function, use the no form of this command.
validate-update-sourceSyntax Description
This command has no arguments or keywords.
Syntax Description
1 Specifies RIP Version 1. 2 Specifies RIP Version 2.
Posted: Wed Jul 26 14:51:46 PDT 2000
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