Foundry Networks FESX Manual page 325

Default DSCP –> Internal Forwarding Priority Mappings
The DSCP values are described in RFCs 2474 and 2475. Table 13.7 list the default mappings of DSCP values to
internal forwarding priority values.
Table 13.7: Default DSCP to Internal Forwarding Priority Mappings
Notice that DSCP values range from 0 – 63, whereas the internal forwarding priority values range from 0 – 7. Any
DSCP value within a given range is mapped to the same internal forwarding priority value. For example, any
DSCP value from 8 – 15 maps to priority 1.
After performing this mapping, the device maps the internal forwarding priority value to one of the hardware
forwarding queues.
Table 13.8 list the default mappings of internal forwarding priority values to the hardware forwarding queues.
Table 13.8: Default Mappings of Internal Forwarding Priority Values
December 2005
Internal Forwarding
Priority
0 (lowest priority
queue)
1
2
3
4
5
6
7 (highest priority
queue)
Internal Forwarding
Priority
0 (lowest priority
queue)
1
2
3
4
5
6
7 (highest priority
queue)
© Foundry Networks, Inc.
DSCP Value
0 – 7
8 – 15
16 – 23
24 – 31
32 – 39
40 – 47
48 – 55
56 – 63
Forwarding Queues
qosp0
qosp1
qosp2
qosp3
qosp4
qosp5
qosp6
qosp7
Configuring Quality of Service
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