ipv6 nd ra managed-config-flag


ipv6 nd ra managed-config-flag

no ipv6 nd ra managed-config-flag


Controls the M flag setting in RAs the router transmits on the current interface. Enable the M flag to indicate that hosts can obtain IP address through DHCPv6. The M flag is disabled by default.

The no form of this command turns off (disables) the M flag.

Command context



Administrators or local user group members with execution rights for this command.


  • Enabling the M flag directs hosts to acquire their IPv6 addressing for the current interface from a DHCPv6 server.

  • When the M-bit is enabled, receiving hosts ignore the O flag setting, which is configured using the command ipv6 nd ra other-config-flag.

  • When the M-bit is disabled (the default), receiving hosts expect to receive their IPv6 addresses from RA.

    M flag O flag Description
    0 0 Indicates that no information is available via DHCPv6.
    0 1 Indicates that other configuration information is available via DHCPv6. Examples of such information are DNS-related information or information on other servers within the network.
    1 0 Indicates that addresses are available via Dynamic Host Configuration Protocol (DHCPv6).
    1 1 If the M flag is set, the O flag is redundant and can be ignored because DHCPv6 will return all available configuration information.


switch(config)# interface 1/1/1
switch(config-if)# ipv6 nd ra managed-config-flag