HP PROCURVE 2610 Advanced Traffic Management Manual page 235

Table 6-9. How the Switch Uses the ToS Configuration
Outbound Port
IP Packet Sent Out Depending on the value of the IP
an Untagged Port Precedence bits in the packet's
in a VLAN ToS field, the packet will go to one
of four outbound port queues in
the switch:
1 - 2 = low priority
0 - 3 = normal priority
4 - 5 = high priority
6 - 7 = high priority
IP Packet Sent Out Same as above, plus the IP Prece­
an Untagged Port dence value (0 - 7) will be used to
in a VLAN set a corresponding 802.1p priority
in the VLAN tag carried by the
packet to the next downstream
device. Refer to table 6-10, below.
Table 6-10. ToS IP-Precedence Bit Mappings to 802.1p Priorities
ToS Byte IP
Precedence Bits
Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure QoS for Outbound Traffic
ToS Option:
IP Precedence
(Value = 0 - 7)
For a given packet carrying a ToS codepoint that the switch has
been configured to detect:
• Change the codepoint according to the configured policy and
assign the 802.1p priority specified for the new codepoint in
the DSCP Policy Table (page 6-58).
• Do not change the codepoint, but assign the 802.1p priority
specified for the existing codepoint in the DSCP Policy Table
(page 6-58).
Depending on the 802.1p priority used, the packet will leave the
switch through one of the following queues:
1 - 2 = low priority
0 - 3 = normal priority
4 - 5 = high priority
6 - 7 = high priority
If No-override (the default) has been configured for a specified
codepoint, then the packet is not prioritized by ToS and, by
default, is sent to the "normal priority" queue.
Same as above, plus the Priority value (0 - 7) will be used to set
a corresponding 802.1p priority in the VLAN tag carried by the
packet to the next downstream device. Where No-override is the
assigned priority, the VLAN tag carries a "0" (normal priority)
802.1p setting if not prioritized by other QoS classifiers.
Corresponding
802.1p Priority
000 1
001 2
002 0
003 3
004 4
005 5
006 6
007 7
Differentiated Services
Service Priority Level
Lowest
Low
Normal
Highest
6-45