Extreme Networks EAS 100-24t Switch CLI - Page 131

IGMP Snooping Commands
Extreme Networks EAS 100-24t Switch CLI Manual
131
Example usage:
To configure 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 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 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 users can issue this command.
#config igmp_snooping querier vlan_name default query_interval 125 state enable
Command: config igmp_snooping querier vlan_name default query_interval 125 state
enable
Success.
#
config igmp_snooping querier