D-Link DES-1228/ME Reference Manual page 178

DES-1228/ME Metro Ethernet Managed Switch CLI Reference Guide
config igmp_snooping querier
Purpose
Used to configure the time in seconds between general query transmissions, the
maximum time in seconds to wait for reports from members and the permitted
packet loss that guarantees IGMP snooping.
Syntax config igmp_snooping querier [vlan_name <vlan_name 32> | vlanid <vidlist> | all]
{query_interval <sec 1-65535> | max_response_time <sec 1-25> |
robustness_variable <value 1-255> | last_member_query_interval <sec 1-25> |
state [enable | disable] | version <value 1-3>} (1)
Description This command is used to configure the IGMP snooping querier.
Parameters <vlan_name 32> – The name of the VLAN for which IGMP snooping querier is to
be configured.
<vidlist> − The VID range for which the IGMP snooping querier is to be
configured.
all − Specifies that all VLANs configured on the Switch will be configured.
query_interval <sec 1-25> − Specifies the amount of time in seconds between
general query transmissions. the default setting is 125 seconds.
max_response_time − The maximum time in seconds to wait for reports from
members. 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 membership 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 an 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 multicast 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 – Specifies the version of IGMP packet that will be sent by this VLAN.
Restrictions Only Administrator level, Operator level or Power User level users can issue this
command.
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