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Working with VSCs
Quality of service (QoS)
VSC-based priority
This mechanism is unique to HP ProCurve Networking. 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.
Queue VSC-based priority value
1 Very-based Very High
2 Very-based High
3 Very-based Normal
4 Very-based Low
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.
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)
TOS
This mechanism classifies traffic based on value of the TOS (Type of Service) field in an IP
packet header.
Queue TOS (Type of Service field value)
1 0x30, 0xE0, 0x88, 0xB8
2 0x28, 0xA0
3 0x08, 0x20
4 All other TOS traffic
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