SG350-28 Trunk Ports not holding tagged VLANs

[elliots]

Hi there,

When I load the config attached, if I go into VLAN management afterwards, GE12, LAG 1 and LAG 2 have lost all their tagged VLAN settings. This has happened a couple of times now or when I reboot the switch, the problem arises again. GE12 for example now just has 65UI there and not 60-64T. If I then pull a backup file from the switch now, the config will now say 'switchport trunk port allowed vlan none' under GE12. I have also tested the config once I have uploaded it and it doesn't work.

I am aware VLAN 65 is inactive but we only need one port on this switch, then on the other end there could be a port with 65U to attach a Ubiquiti cloudkey for example so I assume this isn't the problem. 

Love any explanation or insight to why this is happening. Is there something obvious I'm missing in the config? 

Many thanks,

Elliot

[Jaderson Pessoa · Accepted solution]

Helllo @elliots ,

There are inconsistency configuration on your file.

I suggest you allowed just vlans that you need  instead use remove command

interface GigabitEthernet12
switchport mode trunk
switchport trunk native vlan 65 /
switchport trunk allowed vlan remove 1-59,65-4094   << try change switchport trunk allowed vlan 65, but if this post is part of LAG 1 or 2, the same command is necessary on LAG

!
interface Port-Channel1
description ASR_LAG1
switchport mode trunk
switchport trunk native vlan 99
switchport trunk allowed vlan remove 1-9,11-59,71-4094
!
interface Port-Channel2
description ASR_LAG2
switchport mode trunk
switchport trunk native vlan 99
switchport trunk allowed vlan remove 1-9,11-59,71-4094

[elliots]

Hey Jaderson,

Thanks for that, knew it would be something I was missing. I had been editing this from the web interface rather than text file so is there something I could have missed there that would cause this to happen in GUI?

Really appreciate your help!

Elliot

[Jaderson Pessoa]

Hello, Elliots,

I think that is a missing configuration, not a bug. By the way, you can upgrade your IOS.

Regards,

[Deepak Kumar · Accepted solution]

Hi,

Edited:

It looking the Native VLAN of Port 12 and Port-channel 2 are also removed.

interface Port-Channel1
description ASR_LAG1
switchport mode trunk
switchport trunk native vlan 99
switchport trunk allowed vlan remove 1-9,11-59,71-4094
!

Check again the configuration.

Regards,

Deepak Kumar

[elliots]

Hey Deepak,

Thank you for that, really helpful. One other thing, I just posted to Jaderson as well, I was editing this from inside the web interface so not sure how I ended up removing the VLAN at the same time? Do you have any ideas? Just trying to make sure I don't fall in the same trap again in the future.

All the best,

Elliot

[Deepak Kumar]

Hi,

I am not sure what was happened but here is a page which will help you to get all the details about the VLAN.

Login in the Switch--->VLAN Management--->Port VLAN Membership--->Select desire Port-->Join VLAN--->and Change VLAN as required.

Regards,

Deepak kumar