NETGEAR GS748T User Manual

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GS748T Smart Switch
To configure IGMP snooping settings for VLANs:
1. To enable IGMP snooping on a VLAN, enter the VLAN ID in the appropriate field and
configure the IGMP Snooping values:
• Fast Leave Admin Mode. Enable or disable the IGMP Snooping Fast Leave Mode
for the specified VLAN ID. Enabling fast-leave allows the switch to immediately
remove the layer 2 LAN interface from its forwarding table entry upon receiving an
IGMP leave message for that multicast group without first sending out MAC-based
general queries to the interface.You should enable fast-leave admin mode only on
VLANs where only one host is connected to each layer 2 LAN port. This prevents the
inadvertent dropping of the other hosts that were connected to the same layer 2 LAN
port but were still interested in receiving multicast traffic directed to that group. Also,
fast-leave processing is supported only with IGMP version 2 hosts.
• Host Timeout. Sets the value for group membership interval of IGMP snooping for
the specified VLAN ID. The valid range is (Maximum Response Time + 1) to 3600
seconds.
• Maximum Response Time. Enter the amount of time in seconds that a switch will
wait after sending a query on the VLAN because it did not receive a report for a
particular group in that interface. value. The valid range is 1 to 25 seconds. Its value
must be less than the Host Timeout value.
• MRouter Timeout. Enter the amount of time that a switch will wait to receive a query
on the VLAN before removing it from the list of VLANs with multicast routers attached.
Enter a value between 0 and 3600 seconds. The default is 0 seconds, which means
there is no expiration.
• Query Mode. Enable or disable the IGMP Querier Mode for the specified VLAN ID.
• Query Interval. Enter the value for IGMP Query Interval for the specified VLAN ID.
The valid range is 1–1800 seconds. The default is 60 seconds.
2. Click Add to enable IGMP snooping and the associated settings on the specified VLAN.
3. To disable IGMP snooping on a VLAN and remove it from the list, select the check box next
to the VLAN ID and click Delete.
4. To modify IGMP snooping settings for a VLAN, select the check box next to the VLAN ID,
update the desired values, and click Apply.
5. Click Cancel to cancel the configuration on the screen and reset the data on the screen to
the latest value of the switch.

NETGEAR GS748T Specifications

General

Basic switching RJ-45 Ethernet ports quantity	48
MAC address table	16000 entries
Packet buffer memory	1.632 MB
Maximum data transfer rate	1 Gbit/s
Latency	20 µs
I/O ports	48 RJ-45 connectors for 10BASE-T, 100BASE-TX, and 1000BASE-T (Auto Uplink on all ports) 4 SFP slots for fiber Gigabit Ethernet modules
Dimensions (WxDxH)	440 x 260 x 43 mm
Power requirements	100-240VAC 50/60 Hz
Networking features	10BASE-T, 100BASE-TX, 1000BASE-T
Connectivity technology	Wired
Full duplex	Yes
Networking standards	IEEE 802.3x
Minimum system requirements	Category 5 network cables Network card for each PC Network software (e.g., Windows)
Mean time between failures (MTBF)	69930 h
Safety	UL listed (UL 1950)/cUL, IEC950/EN60950
LED indicators	Link, Power
Power consumption (typical)	70 W
Storage temperature (T-T)	-10 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 90 %

Weight and Dimensions

Weight	4000 g