Mark a vlan VOIP

[csco11579831]

Hello,

Can you please tell me how to mark a vlan VOIP with the DSCP field to a value of X?

thank you.

[Karsten Iwen]

It's not possible to answer that without more info. The right solution is dependent on

• the switch model
• the manufacturer of the phone
• if you already have some kind of QoS configured or not

A starting-point for QoS is the "Medianet Campus QoS Design Guide:

http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSCampus_40.html

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[csco11579831]

Hi iwen,

thank you for this document,

i use a CISCO 3845 and i want mark a vlan with value 46,phone type :hardware(Avaya)

it tells you something?

Best regards

James

[Karsten Iwen]

It's best practice to control the marking on the switch on which the traffic enters the network. But of course you can also do it on a router.

Is the VLAN a subinterface on the router? Then you can do it the following way where all traffic entering a specific subinterface is marked with DSCP 46 (ef):

policy-map MARK

  class class-default

    set dscp ef

!

interface gig 0/0.100

  service-policy input MARK

If you don't terminate the VLAN on this router you can match on the subnets that are used for voice when traffic enters an interface:

ip access-list standard VOICE-NETWORKS

  permit 10.10.10.0 0.0.0.255

  permit 10.11.11.0 0.0.0.255

!

class-map VOICE

  match access-group name VOICE-NETWORKS

!

policy-map MARK

  class VOICE

    set dscp ef

!

interface gig 0/0

  service-policy input MARK

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[csco11579831]

ok, thank you for this information by cons if I want to set up end to end,

how do I?

SW_BB0 <--------> RouterX <--------> RouterY <------> RouterZ <--------> Router-customer