Allied Telesis AT-9724TS Reference Manual

config igmp_snooping querier
Purpose Used command configures IGMP snooping querier.
Syntax config igmp_snooping querier [<vlan_name 32> | 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]
Description 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.
Parameters <vlan_name 32> – The name of the VLAN for which IGMP snooping querier is to be configured.
all – Selecting this parameter will configure the IGMP snooping querier for all VLANs on the Switch.
query_interval <sec 1-65535> – Specifies the amount of time in seconds between general query transmissions.
The default setting is 125 seconds.
max_response_time <sec 1-25> – Specifies the maximum time in seconds to 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:
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.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 [enable | disable] – Allows the Switch to be specified as an IGMP Querier or Non-querier.
Restrictions Only administrator-level users can issue this command.
• 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.
Example usage:
To configure the igmp snooping querier:
AT-9724TS:4# config igmp_snooping querier default
query_interval
125 state enable
Command: config igmp_snooping querier default query_interval
125 state enable
S u c c e s s .
A T - 9 7 2 4 T S : 4 #
124
Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch • Command Line Interface Reference Manual

Allied Telesis AT-9724TS Specifications

General

MAC address table	16000 entries
Packet buffer memory	2 MB
Maximum data transfer rate	88 Gbit/s
Full duplex	Yes
Dimensions (WxDxH)	440 x 210 x 44 mm
Power requirements	100-240V AC/50-60Hz
Management platform	SNMP, RMON
Networking features	IEEE 802.3 10T Ethernet, IEEE 802.3u 100TX Ethernet, IEEE 802.3ab 1000T Ethernet, IEEE 802.3z 1000X Ethernet
Connectivity technology	Wired
DHCP features	DHCP client
Security algorithms	SSH
Switch type	Managed
Switch layer	L3+
SFP/SFP+ slots quantity	4
Basic switching RJ-45 Ethernet ports quantity	24
Memory type	SDRAM / Flash
Flash memory	16 MB
Internal memory	256 MB
Power consumption (typical)	90 W
Certification	UL 1950 FCC Class A CSA 22.2 No. 950 EN55022 Class A EN 60950 (TUV) EN50082-1 CE
Storage temperature (T-T)	-25 - 55 °C
Operating temperature (T-T)	0 - 40 °C

Weight and Dimensions

Weight	3200 g