Table Of Contents
ip rip authentication key-chain
RIP Commands
Use the commands in this chapter to configure and monitor Routing Information Protocol (RIP). For RIP configuration information and examples, refer to the "Configuring RIP" chapter of the Network Protocols Configuration Guide, Part 1.
auto-summary (RIP)
To restore the default behavior of automatic summarization of subnet routes into network-level routes, use the auto-summary command in router configuration mode. To disable this function and transmit subprefix routing information across classful network boundaries, use the no form of this command.
auto-summary
no auto-summary
Syntax Description
This command has no arguments or keywords.
Defaults
Enabled (the software summarizes subprefixes to the classful network boundary when crossing classful network boundaries).
Command Modes
Router configuration
Command History
Usage Guidelines
Route summarization reduces the amount of routing information in the routing tables.
RIP Version 1 always uses automatic summarization. If you are using RIP Version 2, you can turn off automatic summarization by specifying no auto-summary. Disable automatic summarization if you must perform routing between disconnected subnets. When automatic summarization is off, subnets are advertised.
Examples
In the following example, network numbers are not summarized automatically:
router ripversion 2no auto-summarydefault-information originate
To generate a default route into RIP, use the default-information originate command in router configuration mode. To disable this feature, use the no form of this command.
default-information originate [route-map mapname]
no default-information originate
Syntax Description
route-map mapname
(Optional) Routing process will generate the default route if the route map is satisfied.
Defaults
This command is disabled by default.
Command Modes
Router configuration
Command History
Usage Guidelines
The route map referenced in the default-information originate command cannot use an extended access list; it can use a standard access list.
Examples
The following example originates a default route (0.0.0.0/0) over a certain interface when 172.68.0.0/16 is present. This is called "conditional default origination."
router ripversion 2network 172.68.16.0default-information originate route-map condition!route-map condition permit 10match ip address 10set interface s1/0!access-list 10 permit 172.68.16.0 0.0.0.255!default-metric (RIP)
To set default metric values for RIP, use this form of the default-metric command in router configuration mode. To return to the default state, use the no form of this command.
default-metric number
no default-metric [number]
Syntax Description
Defaults
Built-in, automatic metric translations, as appropriate for each routing protocol. The metric of redistributed connected and static routes is set to 0.
Command Modes
Router configuration
Command History
Usage Guidelines
The default-metric command is used in conjunction with the redistribute router configuration command to cause the current routing protocol to use the same metric value for all redistributed routes. A default metric helps solve the problem of redistributing routes with incompatible metrics. Whenever metrics do not convert, using a default metric provides a reasonable substitute and enables the redistribution to proceed.
Note
When enabled, the default-metric command applies a metric value of 0 to redistributed connected routes. The default-metric command does not override metric values that are applied with the redistribute command.
Examples
The following example shows a router in autonomous system 109 using both the RIP and the OSPF routing protocols. The example advertises OSPF-derived routes using the RIP protocol and assigns the OSPF-derived routes a RIP metric of 10.
router ripdefault-metric 10redistribute ospf 109Related Commands
redistribute
Redistributes routes from one routing domain into another routing domain.
flash-update-threshold
To suppress regularly scheduled flash updates, use the flash-update-threshold command in router configuration mode. To return to the default state, use the no form of this command.
flash-update-threshold seconds
no flash-update-threshold
Syntax Description
Defaults
This command is disabled by default.
Command Modes
Router configuration
Command History
Usage Guidelines
This command suppresses flash updates when the arrival of a regularly scheduled update matches the number of seconds that is configured with the seconds argument. The range of seconds that can be configure is from 0 to 30 seconds. If the number of seconds matches the number of seconds or is less than the number seconds that is configured with the seconds argument, the flash update is suppressed. If the numbers seconds until the flash update arrives exceeds the number of seconds that is configured with the seconds argument, the flash update is not suppressed. The regular scheduled interval for flash updates and the configuration of the suppression of flash updates can be verified with the show ip protocol command.
Examples
The following example configures a router to suppress a regularly scheduled flash update if the update is due in 10 seconds or less:
router ripflash-update-threshold 10Related Commands
show ip protocols
Displays the parameters and current state of the active routing protocol process.
input-queue
To adjust the depth of the Routing Information Protocol (RIP) input queue, use the input-queue command in router configuration mode. To remove the configured depth and restore the default depth, use the no version of this command.
input-queue depth
no input-queue [depth]
Syntax Description
depth
Numerical value associated with the depth of the RIP input queue. The larger the numerical value, the larger the depth of the queue. The range is 0 to 1024.
Defaults
50
Command Modes
Router configuration
Command History
Usage Guidelines
Consider using the input-queue command if you have a high-end router sending at high speed to a low-speed router that might not be able to receive at the high speed. Configuring this command will help prevent the routing table from losing information.
Examples
The following example sets the depth of the RIP input queue to 100:
input-queue 100Related Commands
ip rip authentication key-chain
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 command in interface configuration mode. Use the no form of this command to prevent authentication.
ip rip authentication key-chain name-of-chain
no ip rip authentication key-chain [name-of-chain]
Syntax Description
Defaults
No authentication is provided for RIP packets.
Command Modes
Interface configuration
Command History
Usage Guidelines
If no key chain is configured with the key-chain command, no authentication is performed on the interface (not even the default authentication).
Examples
The following example configures the interface to accept and send any key belonging to the key chain named trees:
ip rip authentication key-chain treesRelated Commands
key chain
Enables authentication for routing protocols by identifying a group of authentication keys.
ip rip authentication mode
To specify the type of authentication used in RIP Version 2 packets, use the ip rip authentication mode command in interface configuration mode. Use the no form of this command to restore clear text authentication.
ip rip authentication mode {text | md5}
no ip rip authentication mode
Syntax Description
Defaults
Clear text authentication is provided for RIP packets.
Command Modes
Interface configuration
Command History
Usage Guidelines
RIP Version 1 does not support authentication.
Examples
The following example configures the interface to use MD5 authentication:
ip rip authentication mode md5Related Commands
ip rip receive version
To specify a RIP version to receive on an interface basis, use the ip rip receive version command in interface configuration mode. Use the no form of this command to follow the global version rules.
ip rip receive version [1] [2]
no ip rip receive version
Syntax Description
1
(Optional) Accepts only RIP Version 1 packets on the interface.
2
(Optional) Accepts only RIP Version 2 packets on the interface.
Defaults
This command is disabled by default.
Command Modes
Interface configuration
Command History
Usage Guidelines
Use this command to override the default behavior of RIP as specified by the version command. This command applies only to the interface being configured. You can configure the interface to accept both RIP versions.
Examples
The following example configures the interface to receive both RIP Version 1 and Version 2 packets:
ip rip receive version 1 2The following example configures the interface to receive only RIP Version 1 packets:
ip rip receive version 1Related Commands
ip rip send version
To specify a RIP version to send on an interface basis, use the ip rip send version command in interface configuration mode. Use the no form of this command to follow the global version rules.
ip rip send version [1] [2]
no ip rip send version
Syntax Description
1
(Optional) Sends only RIP Version 1 packets out the interface.
2
(Optional) Sends only RIP Version 2 packets out the interface.
Defaults
The software behaves according to the router version command.
Command Modes
Interface configuration
Command History
Usage Guidelines
Use this command to override the default behavior of RIP as specified by the router version command. This command applies only to the interface being configured.
The following example configures the interface to send both RIP Version 1 and Version 2 packets out the interface:
ip rip send version 1 2The following example configures the interface to send only RIP Version 2 packets out the interface:
ip rip send version 2Related Commands
ip rip receive version
Specifies a RIP version to receive on an interface basis.
version
Specifies a RIP vesrion used globally by the router.
ip split-horizon (RIP)
To enable the split horizon mechanism, use the ip split-horizon command in interface configuration mode. To disable the split horizon mechanism, use the no form of this command.
ip split-horizon
no ip split-horizon
Syntax Description
This command has no arguments or keywords.
Defaults
Default behavior varies with media type.
Command Modes
Interface configuration
Command History
Usage Guidelines
For all interfaces except those for which either Frame Relay or SMDS encapsulation is enabled, the default condition for this command is ip split-horizon; in other words, the split horizon feature is active. If the interface configuration includes either the encapsulation frame-relay or encapsulation smds commands, then the default is for split horizon to be disabled. Split horizon is not disabled by default for interfaces using any of the X.25 encapsulations.
Note
Note
Note
The following simple example disables split horizon on a serial link. The serial link is connected to an X.25 network:
interface serial 0encapsulation x25no ip split-horizonRelated Commands
neighbor (RIP)
Defines a neighboring router with which to exchange routing information.
neighbor (RIP)
To define a neighboring router with which to exchange routing information, use this form of the neighbor command in router configuration mode. To remove an entry, use the no form of this command.
neighbor ip-address
no neighbor ip-address
Syntax Description
Defaults
No neighboring routers are defined.
Command Modes
Router configuration
Command History
Usage Guidelines
This command permits the point-to-point (nonbroadcast) exchange of routing information. When it is used in combination with the passive-interface router configuration command, routing information can be exchanged between a subset of routers and access servers on a LAN.
Multiple neighbor commands can be used to specify additional neighbors or peers.
Examples
In the following example, RIP updates are sent to all interfaces on network 10.108.0.0 except interface Ethernet 1. However, in this case a neighbor router configuration command is included. This command permits the sending of routing updates to specific neighbors. One copy of the routing update is generated per neighbor.
router ripnetwork 10.108.0.0passive-interface ethernet 1neighbor 10.108.20.4Related Commands
network (RIP)
To specify a list of networks for the Routing Information Protocol (RIP) routing process, use this form of the network command in router configuration mode. To remove an entry, use the no form of this command.
network network-number
no network network-number
Syntax Description
Defaults
No networks are specified.
Command Modes
Router configuration
Command History
Usage Guidelines
The network number specified must not contain any subnet information. There is no limit to the number of network commands you can use on the router. RIP routing updates will be sent and received only through interfaces on this network.
RIP sends updates to the interfaces in the specified networks. Also, if an interface's network is not specified, it will not be advertised in any RIP update.
Examples
The following example defines RIP as the routing protocol to be used on all interfaces connected to networks 10.99.0.0 and 192.168.7.0:
router ripnetwork 10.99.0.0network 192.168.7.0Related Commands
offset-list
To add an offset to incoming and outgoing metrics to routes learned via RIP, use the offset-list command in router configuration mode. To remove an offset list, use the no form of this command.
offset-list {access-list-number | name} {in | out} offset [type number]
no offset-list {access-list-number | name} {in | out} offset [type number]
Syntax Description
Defaults
This command is disabled by default.
Command Modes
Router configuration
Command History
10.0
This command was introduced.
10.3
The type and number arguments were added.
11.2
The name argument was added.
Usage Guidelines
The offset value is added to the routing metric. An offset-list with an interface type and interface number is considered extended and takes precedence over an offset-list that is not extended. Therefore, if an entry passes the extended offset-list and the normal offset-list, the extended offset-list's offset is added to the metric.
Examples
In the following example, the router applies an offset of 10 to the router's delay component only to access list 21:
offset-list 21 out 10In the following example, the router applies an offset of 10 to routes learned from Ethernet interface 0:
offset-list 21 in 10 ethernet 0output-delay
To change the interpacket delay for RIP updates sent, use the output-delay command in router configuration mode. To remove the delay, use the no form of this command.
output-delay delay
no 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.
Defaults
0 milliseconds
Command Modes
Router configuration
Command History
Usage Guidelines
Consider using this command if you have a high-end router sending at high speed to a low-speed router that might not be able to receive at the high speed. Configuring this command will help prevent the routing table from losing information.
Examples
The following example sets the interpacket delay to 10 milliseconds:
output-delay 10router rip
To configure the Routing Information Protocol (RIP) routing process, use the router rip command in global configuration mode. To turn off the RIP routing process, use the no form of this command.
router rip
no router rip
Syntax Description
This command has no arguments or keywords.
Defaults
No RIP routing process is defined.
Command Modes
Global configuration
Command History
Examples
The following example shows how to begin the RIP routing process:
router ripRelated Commands
network (RIP)
Specifies a list of networks for the Routing Information Protocol (RIP) process.
timers basic
To adjust RIP network timers, use the timers basic command in router configuration mode. To restore the default timers, use the no form of this command.
timers basic update invalid holddown flush
no timers basic
Syntax Description
Defaults
update is 30 seconds
invalid is 180 seconds
holddown is 180 seconds
flush is 240 secondsCommand Modes
Router configuration
Command History
Usage Guidelines
The basic timing parameters for RIP are adjustable. Since RIP is executing a distributed, asynchronous routing algorithm, it is important that these timers be the same for all routers and access servers in the network.
Note
The following example sets updates to be broadcast every 5 seconds. If a router is not heard from in 15 seconds, the route is declared unusable. Further information is suppressed for an additional 15 seconds. At the end of the suppression period, the route is flushed from the routing table.
router riptimers basic 5 15 15 30
Note
validate-update-source
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 command in router configuration mode. To disable this function, use the no form of this command.
validate-update-source
no validate-update-source
Syntax Description
This command has no arguments or keywords.
Defaults
The behavior of this command is enabled by default.
Command Modes
Router configuration
Command History
Usage Guidelines
This command is applicable only to RIP and IGRP. The software ensures that the source IP address of incoming routing updates is on the same IP network as one of the addresses defined for the receiving interface.
Disabling split horizon on the incoming interface will also cause the system to perform this validation check.
For unnumbered IP interfaces (interfaces configured as ip unnumbered), no checking is performed.
Examples
The following example configures a router not to perform validation checks on the source IP address of incoming RIP updates:
router ripnetwork 10.105.0.0no validate-update-sourceversion
To specify a RIP version used globally by the router, use the version command in router configuration mode. Use the no form of this command to restore the default value.
version {1 | 2}
no version
Syntax Description
Defaults
The software receives RIP Version 1 and Version 2 packets, but sends only Version 1 packets.
Command Modes
Router configuration
Command History
Usage Guidelines
To specify RIP versions used on an interface basis, use the ip rip receive version and ip rip send version commands.
Examples
The following example enables the software to send and receive RIP Version 2 packets:
version 2Related Commands
