DSCP 4863 to queue

At the distribution switch, configure the trust boundary to trust the DSCP or CoS marking from the core and access layer switches. For Layer 2-to-Layer 3 and Layer 3-to-Layer 2 QoS mappings, the Catalyst 4500 has default CoS-to-DSCP and DSCP-to-CoS mappings. However, you can manually configure these default mappings to override the default mappings. The Catalyst 4500 has these CoS-to-DSCP and DSCP-to-CoS mappings:

CoS-to-DSCP Default Mapping

Marker

Value

CoS Values

0

1

2

3

4

5

6

7

DSCP

0

8

16

24

32

40

48

56

Values

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DSCP-to-CoS Default Mapping

Marker

Value

DSCP

0 - 7

8 - 15

16 - 23

24 - 31

32 - 39

40 - 47

48 - 55

56 - 63

Values

CoS Values

0

1

2

3

4

5

6

7

You can also implement class-based policing to rate-limit certain traffic classes.

You can also implement class-based policing to rate-limit certain traffic classes.

The figure shows a sample QoS configuration on a Catalyst 4500 distribution switch.

This configuration uses a class map to classify the Citrix server traffic into the citrix-server traffic class.

A traffic policy called "police-citrix" is used to police the Citrix traffic to a committed information rate (CIR) of 48,000 bps with a committed burst (Bc) of 8000 bits. All excess traffic is dropped.

The downlink and uplink ports are configured to trust the DSCP markings from the access and core layer switches.

The transmit queue 3 is configured as the high-priority queue.

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