D-Link DGS-1510 Series - Page 290

DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide
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This command is only available for VLAN interface configuration. The robustness variable provides
fine-tuning to allow for expected packet loss on an interface. The value of the robustness variable is
used in calculating the following IGMP message intervals:
 Group member interval – The amount of time that must pass before a multicast router
decides there are no more members of a group on a network.
This interval is calculated as follows: (robustness variable x query interval) + (1 x query
response interval).
 Other querier present interval – The amount of time that must pass before a multicast
router decides that there is no longer another multicast router that is the querier.
This interval is calculated as follows: (robustness variable x query interval) + (0.5 x query
response interval).
 Last member query count – The number of group-specific queries sent before the router
assumes there are no local members of a group. The default number is the value of the
robustness variable.
Users can increase this value if a subnet is expected to be loose.
Example
This example shows how to configure the robustness variable to be 3 on interface VLAN 1000.
Switch# configure terminal
Switch(config)# vlan 1000
Switch(config-vlan)# ip igmp snooping robustness-variable 3
Switch(config-vlan)#
33-13 ip igmp snooping static-group
This command is used to configure an IGMP snooping static group. Use the no form of this command
is used to delete a static group.
ip igmp snooping static-group GROUP-ADDRESS interface INTERFACE-ID [,|-]
no ip igmp snooping static-group GROUP-ADDRESS [interface INTERFACE-ID [,|-]]
Parameters
GROUP-ADDRESS
Specifies an IP multicast group address.
INTERFACE-ID
(Optional) Specifies an interface or an interface list. The interface
can be a physical interface or a port-channel.
,
(Optional) Specifies a series of interfaces, or a separate a range of
interfaces from a previous range. No space is allowed before and
after the comma.
-
(Optional) Specifies a range of interfaces. No space is allowed
before and after the hyphen.
Default
By default, no static-group is configured.
Command Mode
Interface Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
This command is only available for VLAN interface configuration. This command applies to IGMP
snooping on a VLAN interface to statically add group membership entries.