SMC Networks SMC8606T Manual do Utilizador descarregar pdf (Página 160)

DVANCED

OPICS

4-8

Based on the group membership information learned from IGMP, a

router/switch can determine which (if any) multicast traffic needs to

be forwarded to each of its ports. At Layer 3, multicast routers use

this information, along with a multicast routing protocol such as

DVMRP, to support IP multicasting across the Internet.

Note that IGMP neither alters nor routes any IP multicast packets. A

multicast router/switch must be used to deliver IP multicast packets

across different subnetworks.

Class-of-Service (CoS) Support

The TigerSwitch 1000 provides two transmit queues on each port,

with a weighted round-robin scheme. This function can be used to

provide independent priorities for various types of data such as

real-time video or voice, and best-effort data.

Priority assignment to a packet in the TigerSwitch 1000 can be

accomplished in any of the following ways:

• Priority can be explicitly assigned by end stations which have

applications that require a higher priority than best-effort. This

switch utilizes the IEEE 802.1p and 802.1Q tag structure to decide

priority assignments for the received packets.

• A port may be manually configured as high priority. In this case,

when any other port receives traffic from a high-priority port, that

traffic is automatically placed in the high-priority output queue.

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SMC Networks SMC8606T Manual do Utilizador Página 160