QoS Configuration on IOS-XE (3850)

Answered Question
Aug 14th, 2013

All,

I am configuring a stack of new Cisco 3850's. In the past, we have always used 3750's with the switchport command "mls qos trust dscp" for the purpose of trusting markings sent across from our VOIP phones. This is not an option on IOS-XE so I am wondering, what is the equivalent of this command? Is there a default behavior that antiquates manual config?

~Josh                  

I have this problem too.
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Correct Answer by Reza Sharifi about 8 months 1 week ago

Hi,

On the 3850 series the trust is done by default;

Cisco Catalyst 3850 Trust Behavior

The trust behavior on the Cisco Catalyst 3850 has changed from the that of Cisco Catalyst 3K Series switches. By default, the Cisco Catalyst 3850 trusts markings on the wired ports. For wired ports, differentiated services code point (DSCP) markings in IP packets from endpoints such as IP phones, telepresence units, cameras, and laptops are trusted and retained.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps12686/guide_c07-727066.pdf

HTH

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Correct Answer
Reza Sharifi Wed, 08/14/2013 - 10:22

Hi,

On the 3850 series the trust is done by default;

Cisco Catalyst 3850 Trust Behavior

The trust behavior on the Cisco Catalyst 3850 has changed from the that of Cisco Catalyst 3K Series switches. By default, the Cisco Catalyst 3850 trusts markings on the wired ports. For wired ports, differentiated services code point (DSCP) markings in IP packets from endpoints such as IP phones, telepresence units, cameras, and laptops are trusted and retained.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps12686/guide_c07-727066.pdf

HTH

jameskuder Wed, 09/18/2013 - 21:22

Reza, I am in the same situation. What about these switchport commands that we have used on the 3750X:

switchport priority extend trust

switchport voice detect cisco-phone

mls qos trust device cisco-phone

This is what we have:

License Level: Ipbase

License Type: Permanent

Next reload license Level: Ipbase

cisco WS-C3850-48P (MIPS) processor with 4194304K bytes of physical memory.

Processor board ID FOC1731U08M

2 Virtual Ethernet interfaces

52 Gigabit Ethernet interfaces

4 Ten Gigabit Ethernet interfaces

2048K bytes of non-volatile configuration memory.

4194304K bytes of physical memory.

250456K bytes of Crash Files at crashinfo:.

1609272K bytes of Flash at flash:.

0K bytes of Dummy USB Flash at usbflash0:.

0K bytes of  at webui:.

Base Ethernet MAC Address          : 7c:95:f3:5b:08:00

Motherboard Assembly Number        : 73-14442-08

Motherboard Serial Number          : FOC17304YEM

Model Revision Number              : G0

Motherboard Revision Number        : B0

Model Number                       : WS-C3850-48P

System Serial Number               : FOC1731U08M

Switch Ports Model              SW Version        SW Image              Mode

------ ----- -----              ----------        ----------            ----

     1 56    WS-C3850-48P       03.02.02.SE       cat3k_caa-universalk9 INSTALL

Configuration register is 0x102

-#- --length-- ---------date/time--------- path

  2    2097152 Sep 18 2013 10:57:06 +00:00 nvram_config

  3   74369252 Aug 12 2013 10:03:15 +00:00 cat3k_caa-base.SPA.03.02.02.SE.pkg

  4    5808828 Aug 12 2013 10:03:16 +00:00 cat3k_caa-drivers.SPA.03.02.02.SE.pkg

  5   32488292 Aug 12 2013 10:03:15 +00:00 cat3k_caa-infra.SPA.03.02.02.SE.pkg

  6   30403764 Aug 12 2013 10:03:16 +00:00 cat3k_caa-iosd-universalk9.SPA.150-1.EX2.pkg

  7   16079584 Aug 12 2013 10:03:15 +00:00 cat3k_caa-platform.SPA.03.02.02.SE.pkg

  8   64580300 Aug 12 2013 10:03:16 +00:00 cat3k_caa-wcm.SPA.10.0.111.0.pkg

  9       1224 Aug 12 2013 10:03:26 +00:00 packages.conf

10        616 Sep 18 2013 09:54:39 +00:00 vlan.dat

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Posted August 14, 2013 at 10:10 AM
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