This command has no arguments or keywords.
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 command in router configuration mode. To disable this function, use the no form of this command.
The behavior of this command is enabled by default.
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.
The following example configures a router not to perform validation checks on the source IP address of incoming RIP updates:Router(config)#router rip Router(config-router)#network 10.105.0.0 Router(config-router)#no validate-update-source
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