Black Box LPB5028A, Руководство пользователя

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Chapter 5: Configuration
Figure 5-24. STP Statistics screen.
Parameter description:
• Port: The switch port number of the logical STP port.
• MSTP: The number of MSTP Configuration BPDUs received/transmitted on the port.
• RSTP: The number of RSTP Configuration BPDUs received/transmitted on the port.
• STP: The number of legacy STP Configuration BPDUs received/transmitted on the port.
• TCN: The number of (legacy) Topology Change Notification BPDUs received/transmitted on the port.
• Discarded Unknown: The number of unknown Spanning Tree BPDUs received (and discarded) on the port.
• Discarded Illegal: The number of illegal Spanning Tree BPDUs received (and discarded) on the port.
• Auto-refresh: Select auto-refresh to refresh the information automatically.
• Upper right icon (Refresh, Clear): Click on these icons to refresh the STP Statistics information or clear them manually.
5.5 IGMP Snooping
The function is used to establish the multicast groups to forward the multicast packet to the member ports. It avoids wasting the
bandwidth while IP multicast packets are running over the network. 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 broadcast packets. Without IGMP
Snooping, the multicast packet forwarding function forwards the broadcast packets.
The switch supports IGMP Snooping. This includes query, report, and leave, which is a type of packet exchanged between an IP
Multicast Router/Switch and an IP Multicast Host. The switch can update 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 IGMP Snooping if the user transmits multicast packets to the multicast group that had not been
built in advance. IGMP mode enables the switch to issue an IGMP function to 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.
5.5.1 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. Evoke to select enable or disable which Global configuration
3. Evoke which port wants to become a Router Port or enable/ disable the Fast Leave function.