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Beginner

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

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.

 

 

Screen Shot 2019-05-19 at 10.17.51 AM.png

 

 

6 REPLIES 6
VIP Mentor

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

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

Beginner

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

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

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

Hello,

 

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

Beginner

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

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

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

Hello,

 

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

Beginner

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

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

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