On 6/22/2011 9:45 AM, Michael Picher wrote: > Which port is your sipXecs system plugged into? I don't see a port with > DSCP 46 forced. >
My sipXecs system is plugged into port 7 on a 3Com 4200G. Here's the configuration for that port: interface GigabitEthernet1/0/7 stp edged-port enable broadcast-suppression pps 3000 port access vlan 162 undo jumboframe enable priority-trust cos I have just changed the configuration to the following, changing the priority-trust from cos to dscp: interface GigabitEthernet1/0/7 stp edged-port enable broadcast-suppression pps 3000 port access vlan 162 undo jumboframe enable priority-trust dscp The 3Com switches allow for the automatic setting of the COS to 6 and the DSCP to 46 when ports are configured to be a part of the "voice vlan." "Voice VLAN" is a feature of the 3Com 4200 switches. Our voice vlan is 162 and because the port (interface GigabitEthernet1/0/7) is already in VLAN 162, I believe its DSCP value is already set to 46 because when, as a test, I tried to add the "voice vlan enable" command to that port, it told me the following: [4200G]interface GigabitEthernet1/0/7 [4200G-GigabitEthernet1/0/7]voice vlan enable Can't enable voice vlan because the port is in voice vlan and auto mode has been set! [4200G-GigabitEthernet1/0/7] When I look at the status for the voice VLAN, I see the following: [4200G]display voice vlan status Voice Vlan status: ENABLE Voice Vlan ID: 162 Voice Vlan security mode: Security Voice Vlan aging time: 1440 minutes Current voice vlan enabled port mode: PORT MODE COS DSCP --------------------------------------------- GigabitEthernet1/0/4 AUTO 6 46 GigabitEthernet1/0/5 AUTO 6 46 GigabitEthernet1/0/6 AUTO 6 46 GigabitEthernet1/0/8 AUTO 6 46 GigabitEthernet1/0/9 AUTO 6 46 GigabitEthernet1/0/10 AUTO 6 46 GigabitEthernet1/0/11 AUTO 6 46 GigabitEthernet1/0/12 AUTO 6 46 GigabitEthernet1/0/13 AUTO 6 46 GigabitEthernet1/0/14 AUTO 6 46 GigabitEthernet1/0/15 AUTO 6 46 GigabitEthernet1/0/18 AUTO 6 46 GigabitEthernet1/0/19 AUTO 6 46 GigabitEthernet1/0/20 AUTO 6 46 GigabitEthernet1/0/21 AUTO 6 46 GigabitEthernet1/0/22 AUTO 6 46 GigabitEthernet1/0/23 AUTO 6 46 GigabitEthernet1/0/24 AUTO 6 46 [4200G] The voice VLAN is a dynamic VLAN that automatically detects the presence of IP phones based on their MAC addresses. Since the sipXecs server is not a Polycom phone, it does not appear in this dynamically updated list. The following statement is from the 3Com Switch 4200G Family Configuration Guide: In order to improve the transmission quality of voice traffic, the switch by default re-marks the precedence of the traffic in the voice VLAN as follows: - Set the CoS (802.1p) precedence to 6. - Set the DSCP precedence to 46. _______________________________________________ sipx-users mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-users/
