ECS4110-28T_Management Guide

C HAPTER 38 | Class of Service Commands
Priority Commands (Layer 3 and 4)
– 1203 –
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 160, 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)#qos map dscp-mutation 3 1 from 1
Console(config)#
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
Global Configuration
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.
◆ The specified mapping applies to all interfaces.
Table 161: Mapping Internal Per-hop Behavior to Hardware Queues
Per-hop Behavior 0 1 2 3 4 5 6 7
Hardware Queues 1 0 0 1 2 2 3 3