HP 5300 Informacje Techniczne Pobierz pdf (Strona 259)

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Port Traffic Controls

Guaranteed Minimum Bandwidth (GMB)

Table 13-3. Per-Port Outbound Priority Queues

802.1p Priority Settings in Tagged VLAN

Packets*

Outbound Priority Queue for a Given Port

1 (low) 1

2 (low)

0 (normal) 2

3 (normal)

4 (medium) 3

5 (mediuim)

6 (high) 4

7(high)

*The switch processes outbound traffic on an untagged VLAN at the "0" (normal) priority level.

You can use GMB to reserve a specific percentage of each port’s available

outbound bandwidth for each of the four priority queues. This means that

regardless of the amount of high priority outbound traffic on a port, you can

ensure that there will always be bandwidth reserved for lower-priority traffic.

Since the switch services outbound traffic according to priority (highest to

lowest), the highest-priority outbound traffic on a given port automatically

receives the first priority in servicing. Thus, in most applications, it is neces-

sary only to specify the minimum bandwidth you want to allocate to the lower

three priority queues. In this case, the high-priority traffic automatically

receives all unassigned bandwidth without starving the lower-priority queues.

Conversely, configuring a bandwidth minimum on only the high-priority out-

bound queue of a port (and not providing a bandwidth minimum for the lower-

priority queues) is not recommended because it may “starve” the lower-

priority queues. (See the Note, below.)

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