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xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
165
config igmp_snooping querier
wait for reports from members. The default setting is 10 seconds.
robustness_variable <value 1-255> − 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 lossy. Although 1 is
specified as a valid entry, the roubustness variable should not be one or
problems may arise.
last_member_query_interval <sec 1-25> − The maximum amount of time
between group-specific query messages, including those sent in response to
leave-group messages. Users may 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 [enable | disable] − Allows the Switch to be specified as an IGMP Querier
or Non-querier.
Restrictions Only administrator-level users can issue this command.
Example usage:
To configure IGMP snooping:
DGS-3600:4#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-3600:4#
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 designation of 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.
Parameters add | delete – Specify whether to add or delete ports as router ports.
<vlan_name 32> − The name of the VLAN on which the router port
resides.
<portlist> − Specifies a port or range of ports that will be configured
as router ports. The port list is specified by listing the lowest switch
number and the beginning port number on that switch, separated by
a colon. Then the highest switch number, and the highest port
number of the range (also separated by a colon) are specified. The
beginning and end of the port list range are separated by a dash. For