[cisco-voip] 3750 QoS

[Jason Aarons (AM)]

Cisco has slightly modified its implementation of (informational) RFC 4594, a good explanation of  why is here. For example Cisco uses CS3 for Call Signaling not CS5 as you listed from the RFC.
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSIntro_40.html#wp61104

Table 1-1 for Cisco’s recommendations.
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-Book/QoSIntro.html

In my case I wanted to verify the Service Policy gets processed.

From: Gregory Wenzel [mailto:gwenzel at conres.com]
Sent: Saturday, March 08, 2014 5:13 PM
To: Jason Aarons (AM); cisco-voip (cisco-voip at puck.nether.net)
Subject: RE: 3750 QoS


By default this is what you should go by. RFC guidelines for Traffic Classes

Application

Layer 3  PHB

Layer3 DSCP

L2 Class IPP

Network Control

CS6

48

6

VoIP Telephony

EF

46

5

Call-Signaling

CS5

40

5

Multimedia Conferencing

AF41

34

4

Real-Time Interactive  Video

CS4

32

4

Multimedia Streaming

AF31

26

3

Rea-Time High Definition Broadcast

CS3

24

3

Low-Latency Transactional Data

AF21

18

3

Operations / Administration / Management

CS2

16

2

High-Throughput Data / Bulk Data

AF11

10

1

Best Effort

DF

0

0

Low-priority Data / Scavenger Data

CS1

8

1





From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jason Aarons (AM)
Sent: Friday, March 07, 2014 8:15 PM
To: cisco-voip (cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>)
Subject: [cisco-voip] 3750 QoS

Without ‘mls qos trust device cisco-phone’ this port is not going to match the service-policy.   Correct?  In short I believe this QoS config is wrong.

3750#show run int fa1/0/43
interface FastEthernet1/0/43
switchport access vlan 10
switchport mode access
switchport voice vlan 20
storm-control broadcast level 10.00 5.00
storm-control action shutdown
storm-control action trap
spanning-tree portfast
service-policy input CISCOVOIPVIDEO


class-map match-all VOICE(46)
match ip dscp ef
class-map match-all SOFTPHONE(24)
match ip dscp cs3
class-map match-all VIDEO(34)
match ip dscp af41
!
!
policy-map CISCOVOIPVIDEO
class VIDEO(34)
  set ip dscp af41
class SOFTPHONE(24)
  set ip dscp cs3
class VOICE(46)
  set ip dscp ef


Reference
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/91862-cat3750-qos-config.html

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