SG300-to-SG300 Not Passing Tagged Traffic on Trunk Port

[jsbrown]

I am adding an SG300 to replace an aging 2950x and am having an issue getting tagged VLAN traffic to pass from the SG300(1) to the secondary SG300(2). I have configured port ge51 on both SG300s in trunk mode and allow tag multiple vlans. I also have configured port ge52 on the SG300(1), and port fe2/0/6 on the 2950 in the same way.  SG300(1) and the 2950 have been happily passing traffic for months. However, even after a factory reset and reconfig on SG300(2) the only passed traffic is the default vlan. The SG300(2) is new and running firmware 1.0.4.88. This should be simple stuff, but I am at a loss.

[Georg Pauwen]

Hello,

try and configure the trunk ports as 'General':

VLAN Management > Interface Settings > Interface VLAN Mode > General

and/or explicitly specify the native VLAN:

switchport trunk native vlan 1

[jsbrown]

George, thanks. I had tried both of those previously, but did again just to make sure. Still no joy.

[Georg Pauwen]

Hello,

stupid question maybe, but do the VLANs you are trying to  trunk actually exist on both SG300 switches ?

[jsbrown]

Not stupid at all, but yes they do. I am stumped.

[Georg Pauwen]

Hello,

just another thought: can you check if you have VTP enabled on the 2950 and the other SG300 by any chance ?

[jsbrown]

I can't check the 2950 without going on-site.  I will check and get back to you.  Thanks for the continued help.

[mhbalouch23127]

I have the same problem. Have you resolved it?

[Georg Pauwen]

Hello,

I assume you have tried all the options discussed in this thread ?

Either way, I would do a factory default reset on both switches. The default interface status of all ports is trunk. See if that resolves the issue.