We currently have a pair of Catalyst 3750 switch stacks that have been configured to talk to one another through a trunk. This solution works perfectly. Recently we were faced with the need to extend the network at specific locations for specific VLANs on specific ports. Choice fell to the SF302 switch.
I created a trunk port on the Catalyst, connected it to the SF302 and found I could configure the ports to their respective VLANs and see computers working the way I expected them.
When I however connect a telephone (Siemens) to the SF302, it refuses to work. Connecting it to a port that has the voice VLAN connected to it, the telephone keeps insisting a D02 error which seems to be that it can't reach the DHCP server. Do note: a PC on that same port gets a proper IP address issued. If I set the phone to a static IP the error H02 crops up, which means it can't create a connection to the PBX. So, the SF302 works fine with computers, but fails to work with the Siemens telephones.
I called in to Small Business support to see what can be done, but they ended up with the statement that the SF302 does not support 'tagged' native VLAN traffic, and thus the problem would be in the way the Catalyst sends out it's trunk info. Not sure if this is indeed the issue, but sufficient to look into.
Found this thread: https://supportforums.cisco.com/discussion/11493341/connect-sf302-08p-catalyst-3750 which seems to hint at the same issue.
When digging around about the native VLAN and tagged traffic, I did find this thread: http://serverfault.com/questions/294877/vlan-tagging-on-a-cisco-catalyst-3560 - tho the 'switchport trunk native vlan xxx' doesn't do anything in the Catalyst 3750.
The config on the port used as a trunk on the Catalyst:
switchport trunk encapsulation dot1q
switchport trunk allowed vlan a,bb,ccc,ddd,eee,fff,ggg,hhh
switchport trunk native vlan ccc
switchport mode trunk
The configuration on the gigabit port used as a trunk on the SF302:
switchport trunk allowed vlan add a,bb,ccc,ddd,eee,fff,ggg,hhh
The basic config on all ports on the SF302
spanning-tree portfast
switchport mode access
switchport access vlan xxx
where xxx is any of the VLANs passed on the trunk. Depending on the use of the port on the SF302 I change the VLAN the port is connected to.
The phones are in VLAN ccc.
Does anyone have any idea what I might be able to do to resolve this?
Thanks in advance for any and all replies.
