IPv6 Configuration Guide K/KA/KB.15.15

configuration information for the current VLAN or tunnel interface from a DHCPv6
server.
• When the M-bit is enabled, receiving hosts ignore the
other-config-flag (O-bit) setting described below.
• When the M-bit is disabled (the default), receiving hosts expect to receive
their IPv6 addressing and ND configuration settings from the RA unless the
O-bit is enabled.
other-config-flag
Ignored unless the M-bit (above) is disabled in RAs. Controls the O-bit in RAs
the router transmits on the current VLAN or tunnel.
Enabling the O-bit while the M-bit is disabled directs hosts on the VLAN to
acquire their ND configuration settings from a DHCPv6 server and their global
unicast prefixes from the RA.
The no form of either command turns off (disables) the setting for that command
in RAs.
NOTE: In the default configuration, both the M-bit and the O-bit are disabled,
and a host receiving the RA must acquire its prefix and ND configuration from the
RA itself and not from a DHCPv6 server.
Default for both settings: Disabled
Configuring the range for intervals between RA transmissions on a VLAN
The interval between RA transmissions on a VLAN is a random value that changes every time an
RA is sent. The interval is calculated to be a value between the current max-interval and
min-interval settings described below.
Syntax:
[no] ipv6 nd ra max-interval 4 - 1800
[no] ipv6 nd ra min-interval 3 - 1350
VLAN or tunnel context commands for changing the maximum and minimum intervals
between transmissions of IPv6 RAs on the VLAN. These values have one setting per
VLAN or tunnel and do not apply to RAs sent in response to a router solicitation
received from another device.
max-interval
Must be equal to or less than the configured lifetime setting. Attempting to set
max-interval to a value greater than the configured lifetime setting results
in an error message.
The no form of the max-interval command returns the setting to its
default, provided the default value is less than or equal to 75% of the new
maximum interval you are setting.
Attempting to set max-interval to a value that is not sufficiently larger than
the current min-interval also results in an error message.
Default: 600 seconds; Range: 4 - 1800 seconds
min-interval
Must be less than or equal to 75% of max-interval. Attempting to set
min-interval to a higher value results in an error message.
The no form of the min-interval command returns the setting to its
default, provided the default value is less than or equal to 75% of the current
max-interval setting.
VLAN or tunnel context ND configuration 187