D-Link DGS-3700 Series Reference Manual page 204

DGS-3700 Series Layer 2 Managed Gigabit Ethernet Switch CLI Reference Guide
config igmp_snooping querier
Restrictions
Example usage:
To configure the IGMP snooping querier:
DGS-3700-12:5#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-3700-12:5#
config router_ports
Purpose
Syntax
Description
Parameters
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 lossy.
last_member_query_interval − 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.
state − If the state is enable, it allows the switch to be selected as a IGMP Querier
(sends IGMP query packets). It the state is disabled, then the switch can not play
the role as a querier. Note that if the Layer 3 router connected to the switch provide
only the IGMP proxy function but not provide the mutlicast routing function, then
this state must be configured as disabled. Otherwise, if the Layer 3 router is not
selected as the querier, it will not send the IGMP query packet. Since it will not
also send the multicast-routing protocol packet, the port will be timed out as a
router port.
version – The version of the IGMP Query sent by the switch.
Only Administrator or Operator-level users can issue this command.
Used to configure ports as router ports.
config router_ports [ <vlan_name 32> | vlanid <vlanid_list>] [add |delete]
<portlist>
This command allows users 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.
<vlan_name 32> − The name of the VLAN on which the router port resides.
<vlanid_list> – The VIDs of the VLAN on which the router port resides.
[add|delete] – Specifies whether to add or delete router ports of the specified VLAN.
Page | 204