Chapter 22
| Class of Service Commands
Priority Commands (Layer 3 and 4)
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◆ Two QoS domains can have different DSCP definitions, so the DSCP-to-PHB/
Drop Precedence mutation map can be used to modify one set of DSCP values
to match the definition of another domain. The mutation map should be
applied at the receiving port (ingress mutation) at the boundary of a QoS
administrative domain.
◆ The specified mapping applies to all interfaces.
Example
This example changes the priority for all packets entering port 1 which contain a
DSCP value of 1 to a per-hop behavior of 3 and a drop precedence of 1. Referring to
Table 120, note that the DSCP value for these packets is now set to 25 (3x2
3
+1) and
passed on to the egress interface.
Console(config)#interface ethernet 1/5
Console(config-if)#qos map dscp-mutation 3 1 from 1
Console(config-if)#
qos map phb-queue This command determines the hardware output queues to use based on the
internal per-hop behavior value. Use the no form to restore the default settings.
Syntax
qos map phb-queue queue-id from phb0 ... phb7
no map phb-queue phb0 ... phb7
phb - Per-hop behavior, or the priority used for this router hop. (Range: 0-7)
queue-id - The ID of the priority queue. (Range: 0-7, where 7 is the highest
priority queue)
DEFAULT SETTING.
Command Mode
Interface Configuration (Port, Static Aggregation)
Command Usage
◆ Enter a queue identifier, followed by the keyword “from” and then up to eight
internal per-hop behavior values separated by spaces.
◆ Egress packets are placed into the hardware queues according to the mapping
defined by this command.
Table 121: Mapping Internal Per-hop Behavior to Hardware Queues
Per-hop Behavior 0 1 2 3 4 5 6 7
Hardware Queues 2 0 1 3 4 5 6 7
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