ECS4660-28F_Management Guide-R03

C HAPTER 43 | Multicast Filtering Commands
IGMP (Layer 3)
– 1517 –
and 3, the designated querier is the lowest IP-addressed multicast
router on the subnet.
EXAMPLE
The following shows how to configure the query interval to 100 seconds.
Console(config-if)#ip igmp query-interval 100
Console(config-if)#
RELATED COMMANDS
ip igmp max-resp-interval (1515)
ip igmp robustval This command specifies the robustness (expected packet loss) for this
interface. Use the no form of this command to restore the default value.
SYNTAX
ip igmp robustval robust-value
no ip igmp robustval
robust-value - The robustness of this interface. (Range: 1-255)
DEFAULT SETTING
2
COMMAND MODE
Interface Configuration (VLAN)
COMMAND USAGE
◆ The robustness value is used in calculating the appropriate range for
other IGMP variables, such as the Group Membership Interval, as well
as the Other Querier Present Interval, and the Startup Query Count
(RFC 3376).
◆ Routers adopt the robustness value from the most recently received
query. If the querier's robustness variable (QRV) is zero, indicating that
the QRV field does not contain a declared robustness value, the switch
will set the robustness variable to the value statically configured by this
command. If the QRV exceeds 7, the maximum value of the QRV field,
the robustness value is set to zero, meaning that this device will not
advertise a QRV in any query messages it subsequently sends.
EXAMPLE
Console(config-if)#ip igmp robustness-variable 3
Console(config-if)#