ProCurve 2610-PWR Información técnica descargar pdf (Pagina 202)

Quality of Service (QoS): Managing Bandwidth More Effectively

Introduction

Precedence Criteria Overview

Incoming Where a VLAN-tagged packet enters the switch through a port that is a tagged member of that

802.1p VLAN, if QoS is not configured to override the packet’s priority setting, the switch uses the

Priority packet’s existing 802.1p priority (assigned by an upstream device or application) to determine

which inbound and outbound port queue to use. If there is no QoS policy match on the packet,

and it then leaves the switch through a port that is a tagged member of the VLAN, then there

is no change to its 802.1p priority setting. If the packet leaves the switch through a port that is

an untagged member of the VLAN, the 802.1p priority is dropped.

Entering Outbound Port Exiting

(Inbound) 802.1p Queue (Outbound)

Priority 802.1p Priority

1 - 2 Low 1 - 2

0 - 3 Normal 0 - 3

4 - 5 Medium 4 - 5

6 - 7 High 6 - 7

If a packet does not meet the criteria for Incoming 802.1p priority, then the packet goes to the “normal”

outbound queue of the appropriate port. If the packet entered the switch through a port that is an untagged

member of a VLAN, but exits through a VLAN-tagged port, then an 802.1Q field, including an 802.1p priority,

is added to the packet header. If no QoS policy is configured or applied to the packet, then the 802.1p priority

of 0 (normal) is assigned to the packet for outbound transmission.

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ProCurve 2610-PWR Información técnica Pagina 202