TP-Link T2600G Series User Manual

Configuring Layer 2 Multicast Layer 2 Multicast
User Guide
295
Demonstrated as below:
Figure 1-1 IGMP Snooping
Source
IGMP Querier
Snooping Switch
Router Port
Member Port
Member Port
Host A Host B Host C
Receiver Receiver
Multicast packets transmission
with IGMP Snooping
Source
IGMP Querier
Non-Snooping Switch
Host A Host B Host C
Receiver
Receiver
Multicast packets transmission
without IGMP Snooping
Multicast packets
The following basic concepts of IGMP Snooping will be introduced: IGMP querier, snooping
switch, router port and member port.
IGMP Querier
An IGMP querier is a multicast router (a router or a Layer 3 switch) that sends query
messages to maintain a list of multicast group memberships for each attached network,
and a timer for each membership.
Normally only one device acts as querier per physical network. If there are more than
one multicast router in the network, a querier election process will be implemented to
determine which one acts as the querier.
Snooping Switch
A snooping switch indicates a switch with IGMP Snooping enabled. The switch maintains a
multicast forwarding table by snooping on the IGMP transmissions between the host and
the querier. With the multicast forwarding table, the switch can forward multicast data only
to the ports that are in the corresponding multicast group, so as to constrain the flooding
of multicast data in the Layer 2 network.
Router Port
A router port is a port on snooping switch that is connecting to the IGMP querier.
Member Port
A member port is a port on snooping switch that is connecting to the host.

TP-Link T2600G Series Specifications

General

Model	T2600G Series
Layer	Layer 2+
Type	Managed
Uplink Ports	4 x Gigabit SFP slots
VLAN	4K VLANs
QoS	8 priority queues
Management	Web-based GUI, CLI, SNMP, RMON
Standards and Protocols	IEEE 802.3i, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3z, IEEE 802.3ad, IEEE 802.3x, IEEE 802.1d, IEEE 802.1s, IEEE 802.1w, IEEE 802.1q, IEEE 802.1p, IEEE 802.3af, IEEE 802.3at
Interface	RJ45
L2 Features	STP, RSTP, MSTP, LACP, IGMP Snooping
L3 Features	Static Routing
Security	802.1X, Port Security, DHCP Snooping, IP Source Guard, DoS Defend, ARP Inspection, SSH, SSL, ACL
MAC Address Table	16K
Jumbo Frame	9KB
Operating Temperature	0°C to 40°C
Storage Temperature	-40°C to 70°C
Operating Humidity	10% to 90% RH non-condensing
Storage Humidity	5% to 90% non-condensing