Foundry Networks FESX User Manual

Configuring Quality of Service
December 2005 © Foundry Networks, Inc. 13 - 9
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.
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 13.7: Default DSCP to Internal Forwarding Priority Mappings
Internal Forwarding
Priority
DSCP Value
0 (lowest priority
queue)
0 – 7
1 8 – 15
2 16 – 23
3 24 – 31
4 32 – 39
5 40 – 47
6 48 – 55
7 (highest priority
queue)
56 – 63
Table 13.8: Default Mappings of Internal Forwarding Priority Values
Internal Forwarding
Priority
Forwarding Queues
0 (lowest priority
queue)
qosp0
1 qosp1
2 qosp2
3 qosp3
4 qosp4
5 qosp5
6 qosp6
7 (highest priority
queue)
qosp7

Foundry Networks FESX Specifications

General

Brand	Foundry Networks
Model	FESX
Category	Switch
Language	English