I'm having a problem and am asking for an extra set of eyes on this one. We have an old 24-port 2950 non-PoE switch on a floor of a building with separate voice and data vlans. The ports on the switch I have are set using network assistant with Vlan 512 (voice) and 612 (data). The phones are grabbing DHCP properly, but the PC's are trying to retain addresses from default vlan 1 and will not grab from vlan 612. We use a stack of 3750 switches as our core set of switches and does basic static routing, and provides Vlans to other switches via VTP server mode. On that core stack, I do have the 'ip-helper address' set for the data vlan having problems. By the time it gets to this closet switch, the connection looks like this:
3750 Stack > 3560 Switch > 2950 Switch.
I ran over there and plugged a laptop in directly to the switch port and I get an address fine on the Data Vlan 612. If I plug the laptop in through the PC port of the 7945G IP Phone, I don't get an address. The DHCP scope's appear fine, especially if I get and address.
Where do I check next?
Check VLAN settings in the IP-Phone , some phones are tagging packets that passes thru,if there is any VLAN assighment just turn it off and the packets will be untagged
Implement these settings for testing in any one port to check if ti works with this settings.
switchport trunk encapsulation dot1q
switchport trunk native vlan 612
switchport mode trunk
switchport voice vlan512
on the 2950 the data vlan is untagged so it is the native vlan when it goes through the trunk to 3750.
Is this the native Vlan on the 3750s ?
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