Computer does not get a IP address after a 7961 Phone

Unanswered Question

When a Computer is attach to a IP phone 7961, some times it will not get a IP address when the comupter boot.

it is possibly to fix the problem if the computer is direckly attach to the wall jack it will get a Ip address and it will still get a Ip address if it is attach to the phone again.( I the IP phone is unattach from the wall jack and attach again the computer will not get a Ip address)?

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matthewpage Mon, 03/31/2008 - 03:59
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Could you send the config your using on the switch port??

interface FastEthernet0/33

switchport access vlan 150

switchport mode access

switchport voice vlan 50

mls qos trust dscp

dot1x mac-auth-bypass

dot1x pae authenticator

dot1x port-control auto

dot1x timeout quiet-period 1

dot1x timeout tx-period 1

dot1x reauthentication

dot1x guest-vlan 250

dot1x auth-fail vlan 250

spanning-tree portfast

matthewpage Mon, 03/31/2008 - 10:33
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This seems like a dot1x issue. When you hit the issue can you check that the dot1x has authenticated the port?? i think the command is show dot1x interface fax/x detail.

Also if your using mab there is a known issue that the DHCP times out before its been authenticated. Work around for this is to release, renew the ip address.

I will also try your config out on my switch tomorrow. Are you using ACS or IAS as your radius server??

joepapesh Mon, 03/31/2008 - 20:00
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What version of phone software are you running? It may be impacted by this bug...

CSCse08120 Bug Details Bug #12 of 27 | < Previous | Next >

7961 - PC cannot see data traffic if PC Voice VLAN Access is disabled


PC plugged at the back of a 7961 cannot get its IP settings from DHCP


option "PC Voice VLAN access" is disabled in CCM device configuration (default is "enable" )


re-enable the "PC Voice VLAN access" option

matthewpage Tue, 04/01/2008 - 01:25
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So first are you seeing the port as being authorised when you see this issue??


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