37-32
Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 37 Configuring Quality of Service
Configuring QoS on Supervisor Engines II-Plus, II+10GE, IV, V, V-10GE, 4924, 4948, and 4948-10GE
Configuring the Policy-Map Marking State
To configure the policy map to mark the IP precedence or dscp of a packet, enter this command:
Configuring the Policy-Map Class Trust State
To configure the policy-map class trust state, enter this command:
When configuring the policy-map class trust state, note the following:
• You can enter the no trust command to use the trust state configured on the ingress interface (the
default).
• With the cos keyword, QoS sets the internal DSCP value from received or interface CoS.
• With the dscp keyword, QoS uses received DSCP.
Configuring the Policy-Map Class DBL State
To configure the policy-map class DBL state, enter this command:
When configuring the policy-map class DBL state, note the following:
• Any class that uses a named aggregate policer must have the same DBL configuration to work.
Command Purpose
Switch(config-pmap-c)# [no] set ip
[precedence prec_value | dscp
dscp_value]
Configures the policy-map marking state, which decides
the internal DSCP of the packet for subsequent
processing.
Use the no keyword to clear a configured value and return
to the default.
Command Purpose
Switch(config-pmap-c)# [no] trust
{cos | dscp] Configures the policy-map class trust state, which selects
the value that QoS uses as the source of the internal
DSCP value (see the “Internal DSCP Values” section on
page 37-13).
Use the no keyword to clear a configured value and return
to the default.
Command Purpose
Switch(config-pmap-c)# [no] dbl Configures the policy-map class DBL state, which tracks
the queue length of traffic flows (see the “Active Queue
Management” section on page 37-14).
Use the no keyword to clear an DBL value and return to
the default.