HP 5300 Informacje Techniczne Pobierz pdf (Strona 258)

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101

Port Traffic Controls

Guaranteed Minimum Bandwidth (GMB)

Feature Default Menu CLI Web

bandwidth-min output Per-Queue:

8%-16%-30%-45%

n/a page 13-18 n/a

show bandwidth output [ port-list ] n/a n/a page 13-6 n/a

Introduction

Guaranteed Minimum Bandwidth (GMB) provides a method for ensuring that

each of a given port’s outbound traffic priority queues has a specified mini-

mum consideration for sending traffic out on the link to another device. This

can prevent a condition where applications generating lower-priority traffic

in the network are frequently or continually "starved" by high volumes of

higher-priority traffic. You can configure GMB per-port or per-trunk.

Terminology

Oversubscribed Queue: The condition where there is insufficient bandwidth

allocated to a particular outbound priority queue for a given port. If additional,

unused bandwidth is not available, the port delays or drops the excess traffic.

GMB Operation

The switch services per-port outbound traffic in a descending order of priority;

that is, from the highest priority to the lowest priority. Each port offers four

prioritized, outbound traffic queues. Tagged VLAN traffic is prioritized accord-

ing to the 802.1p priority the traffic carries. Untagged VLAN traffic is assigned

a priority of “0” (normal).

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