Yea, you don't want to 'trust' dscp because sipXecs doesn't set it... you want to force dscp 46 on that port for all traffic...
Thanks, Mike On Wed, Jun 22, 2011 at 11:14 AM, Alex Brown <[email protected]> wrote: > 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/ > -- Michael Picher eZuce Director of Technical Services O.978-296-1005 X2015 M.207-956-0262 @mpicher <http://twitter.com/mpicher> www.ezuce.com
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