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LGB5128A User Manual
68
Displays the port priority. Priority here means Port Priority. Port Priority and
Port Number are mixed to form the Port ID. Port IDs are often compared in
order to determine which port of a bridge would become the Root Port. The
range is 0–240.
Admin Edge :
Displays the port admin edge status. If you don’t set any value, then it will
show default value is Edge.
Admin P2P :
Displays the port admin P2P status. If you don’t set any value, then it will show
default value is Auto.
Auto-refresh:
Click on the auto-refresh box to refresh the information automatically.
Upper right icon (Refresh)
Click this button to refresh the MRSTP port status information manually.
3-6 IGMP Snooping
The function is used to establish the multicast groups to forward multicast packets to the
member ports, and 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 cannot
distinguish multicast packets from broadcast packets, so it can only treat them all as
broadcast packets. Without IGMP Snooping, the multicast packet forwarding function is plain
and nothing is different from broadcast packet forwarding.
IGMP Snooping includes query, report and leave functions. 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 previously joined in a specified IP multicast group.
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.
3-6.1 Basic Configuration
The section describes how 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.
Web Interface
To configure the IGMP Snooping parameters in the web interface:
1. Click Configuration, IGMP Snooping, Basic Configuration.
2. Select enable or disable a Global configuration.
3. Select the port to become a Router Port or enable/disable the Fast Leave function.
4. Scroll to set the Throttling parameter.
5. Click the save button to save the setting
6. If you want to cancel the setting, then you need to click the Reset button.
It will revert to previously saved values