I have a 3560 with 8 VLANs configured. Each VLAN has a Layer 3 (IP) interface configured. On 4 of the 24-ports in the switch I have them configured to support a voice and data vlan (dot1q trunked) as I have Mitel 5224 IP phones plugged into the these ports. Users of these 4 phones have there data connection via the switch on the Mitel phone. The phones all work fine, register, get an ip and are in the correct VLAN. The PCs connected to them do get a DHCP address from the data VLAN but after testing cannot send pings or connect to many TCP services that use packets larger than 1468.
Here is the IOS port configuration for one of these 4 ports that are causing the problem:
switchport trunk encapsulation dot1q
switchport trunk native vlan 6
switchport mode trunk
switchport voice vlan 100
Here is my Layer3 VLAN config for VLAN 6 (DATA):
ip address 10.6.0.1 255.255.0.0
ip helper-address 10.1.1.251
ip dhcp relay information trusted
As a test, if I configured one of these ports in access mode, then I all data, large of small, TCP or ICMP and routing between other VLANs on the 3560 all works fine, as soon as I configure it is a trunk port, then the problem comes!!
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