Dell PowerConnect B-RX - Page 555

BigIron RX Series Configuration Guide 479
53-1002253-01
Classification
18
The mapping between the internal forwarding priority and values received and forwarded can be
changed as follows:
• COS to DSCP Mapping – You can change the mapping between 802.1p (COS) values from the
default values shown in Table 91 through Table 94. This mapping is used for DSCP marking
when trust level is COS. Refer to “Changing the CoS –> DSCP mappings” on page 483.
• DSCP to DSCP Mapping – You can alter the DSCP value of a packet that is received to a value
configured on the switch. This mapping is used for DSCP marking when trust level is DSCP.
Refer to “Changing the DSCP –> DSCP mappings” on page 483.
• 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 91 through Table 94. This mapping is used for COS marking and determining the internal
priority when the trust level is DSCP. Refer to “Changing the DSCP –> internal forwarding
priority mappings” on page 484.
TABLE 92 Default QoS mappings, columns 16 to 31
DSCP value 16171819202122232425262728293031
802.1p (COS)
Value
2222222233333333
DSCP value 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Internal
Forwarding
Priority
2222222233333333
Forwarding
Queue
1111111111111111
TABLE 93 Default QoS mappings, columns 32 to 47
DSCP value 32333435363738394041424344454647
802.1p (COS)
Value
4444444455555555
DSCP value 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
Internal
Forwarding
Priority
4444444455555555
Forwarding
Queue
2222222222222222
TABLE 94 Default QoS mappings, columns 48 to 63
DSCP value 48495051525354555657585960616263
802.1p (COS)
Value
6666666677777777
DSCP value 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
Internal
Forwarding
Priority
6666666677777777
Forwarding
Queue
3333333333333333