Igmp Snooping - General Setup - Draytek VigorSwitch P2261 User Manual

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2 . 3 . 1 3 I G M P S
2 . 3 . 1 3 I G M P S
A switch supported IGMP Snooping with the functions of query, report and leave, a type of
packet exchanged between IP Multicast Router/Switch and IP Multicast Host, can update
the information of the Multicast table when a member (port) joins or leaves an IP Multicast
Destination Address. With this function, once a switch receives an IP multicast packet, it
will forward the packet to the members who joined in a specified IP multicast group before.
The packets will be discarded by the IGMP Snooping if the user transmits multicast
packets to the multicast group that had not been built up in advance. IGMP mode enables
the switch to issue IGMP function that you enable IGMP proxy or snooping on the switch,
which connects to a router closer to the root of the tree. This interface is the upstream
interface. The router on the upstream interface should be running IGMP.
IGMP Snooping is used to establish the multicast groups to forward the multicast packet to
the member ports, and, in nature, avoids wasting the bandwidth while IP multicast packets
are running over the network. This is because a switch that does not support IGMP or
IGMP Snooping can not tell the multicast packet from the broadcast packet, so it can only
treat them all as the broadcast packet. Without IGMP Snooping, the multicast packet
forwarding function is plain and nothing is different from broadcast packet.
Function name:
IGMP Snooping – General Setup
Function description:
The function is used to set the basic IGMP snooping on the switch, which connects to a
router closer to the root of the tree. This interface is the upstream interface. The router on
the upstream interface should be running IGMP.
Parameters description:
Global Configuration
Snooping Enabled
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use mouse to click on "Refresh" button.
The simple counts will be reset to zero when user use
mouse to click on "Clear" button.
n o o p i n g – G e n e r
n o o p i n g – G e n e r
Enable the Global IGMP Snooping.
a l S e t u p
a l S e t u p
VigorSwitch P2261 User's Guide