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1839 Views 1 Reply Latest reply: Mar 15, 2012 2:26 PM by Martin RSS

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CISCO POE Switches and AVAYA IP Phones

Mar 15, 2012 1:16 PM

Mohit 158 posts since
Oct 25, 2010

Hi All,


We have Avaya IP phones in our setup and they are connected to Linksys POE switches and are working fine. We have now got 5 Cisco POE as a replacement for the linksys switches.


Phone Vlan is 12




Initially none of the IP phone would acquire the IP address from the DHCP server. After tshooting the issue for sometime, one of the fone got the IP address and it started working fine. now if the same phone is connected to anyone of the 24 ports of the switch, it acquires the IP and works fine but others are still not getting the IP address from the server .. All the switchports have identical settings


After more tshooting i checked the dynamic mac address-table of the POE switch and found a very weird thing


1) If the fone (which is working fine) is connected to any  of the 24 ports, the mac address shows that its registered in the vlan 12

2) if a different fone is connected to the same port then its mac address gets registered to vlan 1.


Before this i would use switchport voice vlan 12 and the phone which was working fine would get registered on all the ports.  I order to make the others work i used switchport access vlan 12. After plugging the fone(different fone), it would register its mac address on vlan 12 but it would still not acquire the IP address.


This issue is very baffling to say the least.


Switchport configuration combination tried so far


switchport vlan 12

switchport access vlan 12

no cdp enable  / with cdp enabled

with portfast and without portfast

with bpduguard enable and without bpduguard enable

changing the inline power and also making it auto


once again, the fone which works, works on all the ports without any issues, there is no static ip address defined on that.


Kindly help





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