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Cisco Catalyst 3750-X User Manual

Cisco Catalyst 3750-X
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39-12
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 39 Configuring QoS
Understanding QoS
When configuring policing on an SVI, you can create and configure a hierarchical policy map with these
two levels:
VLAN level—Create this primary level by configuring class maps and classes that specify the port
trust state or set a new DSCP or IP precedence value in the packet. The VLAN-level policy map
applies only to the VLAN in an SVI and does not support policers.
Interface level—Create this secondary level by configuring class maps and classes that specify the
individual policers on physical ports the belong to the SVI. The interface-level policy map only
supports individual policers and does not support aggregate policers. You can configure different
interface-level policy maps for each class defined in the VLAN-level policy map.
See the “Cl
assifying, Policing, and Marking Traffic on SVIs by Using Hierarchical Policy Maps” section
on page 39-60 for an example of a hierarchical policy map.
Figure 39-5 sh
ows the policing and marking process when hierarchical policy maps on an SVI.
Figure 39-5 Policing and Marking Flowchart on SVIs
92355
Ye s
Ye s
No
No
Pass
through Drop
Mark
Get the VLAN and
interface-level classification
results for the packet.
Is an interface-level policer
configured for this packet?
Verify if the packet is in the
profile by querying the policer.
Verify the 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

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Cisco Catalyst 3750-X Specifications

General IconGeneral
Switching Capacity160 Gbps
Stacking Bandwidth64 Gbps
Max Stacking Units9
Layer SupportLayer 2 and Layer 3
Form FactorRack-mountable
DRAM256 MB
Flash Memory64 MB
ModelCisco Catalyst 3750-X Series
Ports24 or 48 10/100/1000 Ethernet ports
Uplink Interfaces4 SFP or 2 SFP+
FeaturesStackWise Plus, EnergyWise
ImageIP Base or IP Services
Operating Temperature0 to 40°C
Operating Humidity10 to 85% noncondensing

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