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DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
313
config igmp_snooping querier
The default setting is 10 seconds.
robustness_variable - Provides fine-tuning to allow for expected packet loss on a subnet. The
value of the robustness variable is used in calculating the following IGMP message intervals:
Group member interval - 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 - 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 - 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.
By default, the robustness variable is set to 2. You might want to increase this value if you
expect a subnet to be loosely.
last_member_query_interval - Specify the maximum amount of time between group-specific
query messages, including those sent in response to leave-group messages. You might
lower this interval to reduce the amount of time it takes a router to detect the loss of the last
member of a group.
On receiving a leave message, the router will assume there are no local members on the
interface if there are no reports received after the response time (which is last member query
interval * robustness variable)
state - If the state is enabled, it allows the switch to be selected as an IGMP Querier (sends
IGMP query packets). It the state is disabled, then the switch cannot play the role as a
querier.
Note: If the l3 router connected to the switch provide only the IGMP proxy function but does
not provide the multicast routing function, then this state must be configured as disabled.
Otherwise, if the l3 router is not selected as the querier, it will not send the IGMP query
packet. Since it will not send the multicast-routing protocol packet, the port will be timed out
as a router port.
version - Specify the version of IGMP packet that will be sent by this port. If an IGMP packet
received by the interface has a version higher than the specified version, this packet will be
dropped.
Restrictions Only Administrator and Operator-level users can issue this command.
Example usage:
To configure the IGMP snooping querier:
DGS-3627:admin# config igmp_snooping querier vlan default query_interval 125 state enable
Command: config igmp_snooping querier vlan default query_interval 125 state enable
Success.
DGS-3627:admin#
config router_ports
Purpose Used to configure ports as router ports.
Syntax
config router_ports <vlan_name 32> [add | delete] <portlist>
Description This command allows you to designate a range of ports as being connected to multicast-
enabled routers. This will ensure that all packets with such a router as its destination will
reach the multicast-enabled router, regardless of protocol, etc.