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#115587 06/02/12 11:45 AM
Joined: Mar 2006
Posts: 328
Member
Member
Joined: Mar 2006
Posts: 328
Hello. I have a 5000 CP with 5 remote nodes. Phones are connected to a Cisco switch with PoE and auto voice VLAN enabled. Latest software on the switches. I'm using dnsmasq for DHCP. DHCP options used are: 128,129,130,132,133,134. The issue is that the phones sometimes do not boot when I specify DHCP options 132 (1) 133 (5), and 134 (46). The phones always boot fine if I leave the VLAN options out. However with the vlan id, priority, and DSCP option set then the phones sometimes hang and then display the VLAN id as a very large number, then they hang again at option 128+. My primary question is, to use auto voice VLAN, is that the proper way to do so? Tell the phones VLAN 1, priority 5, and DSCP 46? I figured that if these options are not set, then no prioritization will occur even though the switch has auto voice vlan enabled. At the switch, a show run command shows the phone ports being detected by LLDP as IP phones and IP phones with desktops. Please advise the best way to use auto voice vlan. Thank you very much!


Hackbarth Communications, L.L.C. - Serving South Central Wisconsin's Telecom Needs
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Joined: Mar 2006
Posts: 328
Member
Member
Joined: Mar 2006
Posts: 328
Update - I realized that the Vlan 1 and Pri 5 was coming from LLDP, not from my DHCP options. So I removed options 132, 133, and 134. While it's much better now (the phones always boot and work), they only detect the VLAN details when plugged in a short while after the switch has booted. So if the switch is rebooted, the phones never join the vlan (but they do boot now). Unplug and replug the phone and it always joins the voice VLAN. I thought no problem, I'll send a reset signal from the CP. But more than half the time the phones still won't join the VLAN. If the phone loses power then gets it again, it ALWAYS joins the VLAN. I suppose this is an issue with the switch and LLDP not coming up fully before it adds PoE to the ports on boot? If I'm missing anything please let me know. Thanks.


Hackbarth Communications, L.L.C. - Serving South Central Wisconsin's Telecom Needs

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