The number of MSTP Configuration BPDU's received/transmitted on the port.
RSTP:
The number of RSTP Configuration BPDU's received/transmitted on the port.
STP:
The number of legacy STP Configuration BPDU's received/transmitted on the port.
TCN:
The number of (legacy) Topology Change Notification BPDU's received/transmitted on the port.
Discarded Unknown:
The number of unknown Spanning Tree BPDU's received (and discarded) on the port.
Discarded Illegal:
The number of illegal Spanning Tree BPDU's received (and discarded) on the port.
Auto-refresh:
Activate the auto-refresh to refresh the information automatically.
Refresh
Refresh the STP Statistics information manually.
Clear
Clear the STP Statistics information manually.
3.5 IGMP Snooping
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.
A switch which supports 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.
3.5.1 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. Activate to select enable or disable which Global configuration
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LANCOM GS-2310P/GS-2326(P) User Manual
3 Configuration
