C
ONFIGURING
THE
S
WITCH
3-174
CLI – The following example shows how to assign WRR weights to each
of the priority queues.
Layer 3/4 Priority Settings
Mapping Layer 3/4 Priorities to CoS Values
This switch supports several common methods of prioritizing layer 3/4
traffic to meet application requirements. Traffic priorities can be specified
in the IP header of a frame, using the priority bits in the Type of Service
(ToS) octet or the number of the TCP port. If priority bits are used, the
ToS octet may contain three bits for IP Precedence or six bits for
Differentiated Services Code Point (DSCP) service. When these services
are enabled, the priorities are mapped to a Class of Service value by the
switch, and the traffic then sent to the corresponding output queue.
Because different priority information may be contained in the traffic, this
switch maps priority values to the output queues in the following manner:
• The precedence for priority mapping is IP Port Priority, IP Precedence
or DSCP Priority, and then Default Port Priority.
• IP Precedence and DSCP Priority cannot both be enabled. Enabling
one of these priority types will automatically disable the other.
Console(config)#queue bandwidth 6 9 12 4-225
Console(config)#exit
Console#show queue bandwidth 4-227
Queue ID Weight
-------- ------
0 1
1 6
2 9
3 12
Console
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