Cisco Catalyst 3120 User Manual

36-10
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
OL-12247-01
Chapter 36 Configuring QoS
Understanding QoS
Figure 36-4 Policing and Marking Flowchart on Physical Ports
Policing on SVIs
Note Before configuring a hierarchical policy map with individual policers on an SVI, you must enable
VLAN-based QoS on the physical ports that belong to the SVI. Though a policy map is attached to the
SVI, the individual policers only affect traffic on the physical ports specified in the secondary interface
level of the hierarchical policy map.
A hierarchical policy map has two levels. The first level, the VLAN level, specifies the actions to be
taken against a traffic flow on an SVI. The second level, the interface level, specifies the actions to be
taken against the traffic on the physical ports that belong to the SVI and are specified in the
interface-level policy map.
86835
Ye s
Ye s
No
No
Pass
through Drop
Mark
Get the clasification
result for the packet.
Is a policer configured
for this packet?
Check if the packet is in
p
rofile by querying the policer.
Check out-of-profile action
configured for this policer.
Drop packet.
Modify DSCP according to the
policed-DSCP map. Generate
a new QoS label.
Start
Done

Cisco Catalyst 3120 Specifications

General

Brand	Cisco
Model	Catalyst 3120
Category	Switch
Language	English