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Foundry Configuration Guide for the FESX, FSX, and FWSX
13 - 6
© Foundry Networks, Inc.
December 22, 2005
Mapping between DSCP value and Forwarding Queue cannot be changed. However, mapping between DSCP
values and the other properties can be changed as follows:
•
DSCP to Internal Forwarding Priority Mapping
– You can change the mapping between the DSCP value
and the Internal Forwarding priority value from the default values shown in Table 13.2 through Table 13.5.
This mapping is used for COS marking and determining the internal priority when the trust level is DSCP. See
“Changing the DSCP –> Internal Forwarding Priority Mappings” on page 13-10.
•
Internal Forwarding Priority to Forwarding Queue
– You can reassign an internal forwarding priority to a
different hardware forwarding queue. See “Changing the Internal Forwarding Priority –> Hardware
Forwarding Queue Mappings” on page 13-10.
QoS Queues
Foundry devices support the eight QoS queues (qosp0 – qosp7) listed in Table 13.6.
The queue names listed above are the default names. If desired, you can rename the queues as instructed in
“Renaming the Queues” on page 13-12.
Packets are classified and assigned to specific queues based on the criteria shown in Figure 13.1.
Table 13.5: Default QoS Mappings, Columns 48 to 63
DSCP value
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
802.1p
(COS) Value
6
6
6
6
6
6
6
6
7
7
7
7
7
7
7
7
DSCP value
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
Internal
Forwarding
Priority
6
6
6
6
6
6
6
6
7
7
7
7
7
7
7
7
Forwarding
Queue
6
6
6
6
6
6
6
6
7
7
7
7
7
7
7
7
Table 13.6: QoS Queues
QoS Priority Level
QoS Queue
0
qosp0 (lowest priority
queue)
1
qosp1
2
qosp2
3
qosp3
4
qosp4
5
qosp5
6
qosp6
7
qosp7 (highest priority
queue)
Summary of Contents for FastIron Edge Switch X424
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