3 Replies Latest reply on Feb 29, 2012 6:52 AM by levi Branched from an earlier discussion.

    Voice VLAN

    cj! Beta_User

      Thx for that tip, Levi .  Didn't know the two commands could be in conflict.  So I got rid of "access vlan" on a test switchport 0/32 and show interface status seems to indicate that swx 0/32 is back to default--access port for default VLAN 1.  It's not a trunk port.  But "voice vlan" seems to allow the phone to tag/encapsulate its traffic VLAN 7 anyway.  It's like a hybrid access port that allows 802.1Q for media endpoints only.  Is that a good way to describe it?

       

      I will get rid of "access vlan" for the remaining phone ports today (need a maintenance window as it causes our endpoints to reinitialize), and I'll reply again with the status of the 1238's CPU load and the bcmLINK.0 task...

        • Re: Voice VLAN
          levi Employee

          CJ:

           

          I branched the topic of voice VLANs to a new question.

           

          The switchport voice vlan <vlan id> [ cos <value> ] [dscp <value>] command is used for a couple specific scenarios:

           

          1) it sets the access port to also accept tagged traffic with the specified VLAN ID

          2) if the phone supports LLDP-MED, the phone should automatically switch to the specified VLAN for its traffic, as well as use the specified DSCP/COS values (CoS (5); and DSCP (46) are default for this command)

           

          For example, if not doing LLDP-MED, then these configurations are pretty much the same thing:

           

          interface switchport 0/1

          switchport access vlan 100

          switchport voice vlan 200

           

          interface switchport 0/1

          switchport mode trunk

          switchport trunk allowed vlan 100,200

          switchport trunk native vlan 100

           

          I hope this makes sense, but please do not hesitate to reply to this discussion with further questions or additional information about "voice vlans."  I will be happy to help.

           

          Levi