The ipv6 nd ra advertised-mtu disable command disables RA messages from carrying the MTU option.
The undo ipv6 nd ra advertised-mtu disable command restores the default configuration.
By default, RA messages carry the MTU option.
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Usage Scenario
By default, the MTU value contained in RA messages is the same as that configured using the ipv6 mtu command. If the ipv6 mtu command has not been run to configure the MTU option, the default interface MTU is used. To disable RA messages sent by a device from carrying the MTU option, run the ipv6 nd ra advertised-mtu disable command.
Prerequisites
IPv6 has been enabled on the involved interface using the ipv6 enable command.
Configuration Impact
Upon receipt of the RA messages that carry the MTU option, the host adjusts the size of the RA messages to be forwarded based on the MTU value.