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Working with VSCs

Quality of service (QoS)

5-39

VSC-based priority

This mechanism is unique to HP. It enables you to assign a single priority level to all traffic on

a VSC. If you enable the VSC-based priority mechanism, it takes precedence regardless of the

priority mechanism supported by associated client stations. For example, if you set VSC-

based low priority, then all devices that connect to the VSC have their traffic set at this

priority, including SVP clients.

DiffServ (Differentiated Services)

This mechanism classifies traffic based on the value of the Differentiated Services (DS)

codepoint field in IPv4 and IPv6 packet headers (as defined in RFC2474). The codepoint is

composed of the six most significant bits of the DS field.

TOS

This mechanism classifies traffic based on value of the TOS (Type of Service) field in an IP

packet header.

Queue VSC-based priority value

1 VSC-based Very High

2 VSC-based High

3 VSC-based Normal

4 VSC-based Low

Queue DiffServ (DS codepoint value)

1 111000 (Network control)

110000 (Internetwork control)

2 101000 (Critical)

100000 (Flash override)

3 011000 (Flash)

000100 (Routine)

4 010000 (Immediate)

001000 (Priority)

Queue TOS (Type of Service field value)

1 0x30, 0xE0, 0x88, 0xB8

2 0x28, 0xA0

3 0x08, 0x20

4 All other TOS traffic

HP MSM7XX User Manual

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