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Cisco Catalyst 3750 Software Configuration Guide

Cisco Catalyst 3750
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26-47
Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 26 Configuring QoS
Configuring Standard QoS
Configuring the DSCP Trust State on a Port Bordering Another QoS Domain
If you are administering two separate QoS domains between which you want to implement QoS features
for IP traffic, you can configure the switch ports bordering the domains to a DSCP-trusted state as shown
in Figure 26-14. Then the receiving port accepts the DSCP-trusted value and avoids the classification
stage of QoS. If the two domains use different DSCP values, you can configure the
DSCP-to-DSCP-mutation map to translate a set of DSCP values to match the definition in the other
domain.
Figure 26-14 DSCP-Trusted State on a Port Bordering Another QoS Domain
Beginning in privileged EXEC mode, follow these steps to configure the DSCP-trusted state on a port
and modify the DSCP-to-DSCP-mutation map. To ensure a consistent mapping strategy across both QoS
domains, you must perform this procedure on the ports in both domains:
101235
QoS Domain 1 QoS Domain 2
Set interface to the DSCP-trusted state.
Configure the DSCP-to-DSCP-mutation map.
IP traffic
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
mls qos map dscp-mutation
dscp-mutation-name in-dscp to out-dscp
Modify the DSCP-to-DSCP-mutation map.
The default DSCP-to-DSCP-mutation map is a null map, which maps
an inbound DSCP value to the same DSCP value.
For dscp-mutation-name, enter the mutation map name. You can
create more than one map by specifying a new name.
For in-dscp, enter up to eight DSCP values separated by spaces.
Then enter the to keyword.
For out-dscp, enter a single DSCP value.
The DSCP range is 0 to 63.
Step 3
interface interface-id Specify the port to be trusted, and enter interface configuration mode.
Valid interfaces include physical ports.
Step 4
mls qos trust dscp Configure the ingress port as a DSCP-trusted port. By default, the port
is not trusted.

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Cisco Catalyst 3750 Specifications

General IconGeneral
Device TypeSwitch
Switching Capacity32 Gbps
Forwarding Rate38.7 Mpps
Stacking Bandwidth32 Gbps
RAM128 MB
Jumbo Frame SupportYes
Switch TypeManaged
ModelCatalyst 3750 Series
Uplink InterfacesSFP
Form FactorRack-mountable
MAC Address Table Size12, 000 entries
Routing ProtocolRIP, OSPF, EIGRP
Remote Management ProtocolSNMP, Telnet, HTTP
FeaturesLayer 3 switching, Layer 2 switching, auto-negotiation, BOOTP support, ARP support, VLAN support, auto-uplink (auto MDI/MDI-X), IGMP snooping, traffic shaping, MAC address filtering, Quality of Service (QoS), Jumbo Frames support, MLD snooping, Dynamic ARP Inspection (DAI), Cisco EnergyWise technology
Power over Ethernet (PoE)PoE
Operating Temperature-5 - 45 °C
Operating Humidity10% to 85% non-condensing

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