Upvel UP-308FEW — понимание IGMP Snooping и настройки VLAN Uplink в коммутаторах [47/52]

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UP-308FEW / UP-316FEW

IGMP Snooping V1 & V2

By default, a switch will flood multicast traffic to all ports in a broadcast domain. Multicast may

cause unnecessary load on host devices by requiring them to process packets they have not

solicited. The IGMP snooping feature allows the switch to listen in on the IGMP

communications between hosts and routers. By listening (also known as snooping) to these

communications, the switch maintains a map of which ports (clients) need which multicast

stream (source). Multicast that is not solicited by certain clients (or IGMP group) will be

filtered.

VLAN Uplink Setting

This switch does not implement an Independent VLAN (IVL) MAC address table, it utilizes

VLAN uplink to emulate the function of IVL. An independent VLAN MAC address table is

based on both the source MAC address and the VLAN. In some applications, if the switch

cannot build the separate MAC address table for different VLANs, there will be a conflict of

MAC address table. To solve this problem, the switch controller utilizes the VLAN Uplink port

to emulate the usage of Independent VLAN MAC Address Table.

VLAN Uplink function allows different VLANs to use individual uplink port to forward packets.

In a normal application, only one uplink port can be selected in a switch.

If VLAN Uplink function is enabled and the destination port of a unicast packet is located at

the next VLAN, this packet will be forwarded to the uplink port. Choose the Uplink Port X for

the port ID. The Uplink X will be the uplink port of its VLAN.

Note. There is a functional conflict between VLAN Striding and VLAN Uplink. So if both

VLAN Striding and VLAN Uplink are enabled simultaneously, the switch selects VLAN

Striding and ignores the VLAN Uplink setting.

User Manual 47