interfaces <interface> ip igmp enforce-router-alert
Enables strict Router Alert validation for IGMP.
A strict Router Alert validation is disabled.
- interface
- The type of interface. For a list of supported interfaces and detailed syntax, see interfaces <interface> ip igmp.
Configuration mode
interfaces interface {
ip {
igmp {
enforce-router-alert
}
}
}
Use this command to put strict Router Advertisement (RA) validation into effect for IGMP.
RA validation helps prevent against spoofing attacks. When strict RA validation is in effect, the router silently discards any received RA messages that do not satisfy the validity checks specified in RFC 2461.
Use the set form of this command to enable strict RA validation.
Use the delete form of this command to restore the default behavior.
Use the show form of this command to show RA validation configuration.