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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

validate-update-source — router

Synopsis

validate-update-source
no validate-update-source

Configures

Validation of routing sources

Default

Enabled

Description

The validate-update-source command checks to make sure that the source IP address of incoming routing updates is on the same network as the interface receiving the update. This feature gives some protection against spoofing attacks.

Example

To disable this feature, use the no form of this command:

router rip
  network 10.10.0.0
  no validate-update-source

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