The operating system on the 200,300 and 500 series switches is not traditional Cisco IOS that you would find on a 2960s or 3750X.
So the look and feel is close not not the same. The show run on my SG300-10P showed the following below in blue.
So was the difference between your 300 series switch and my 300 series switch due to firmware differeneces.
I am using the following firmware on my switch as show below;
SG300(config-if)#do show ver
SW version 126.96.36.199 ( date 19-Jul-2012 time 17:54:43 )
Boot version 188.8.131.52 ( date 08-Apr-2010 time 16:37:57 )
HW version V01
rmon collection stats 1 owner dave
switchport trunk native vlan 3
voice vlan cos mode all
switchport mode access
switchport trunk allowed vlan add 3
Don't know enough about your switches working environment to comment on the VLAN failure you had.
the sort of question I might ask is what firmware is on your unit?
was the so called failing port in vlan trunk, general, access modes ?
do you have a copy of the old running config to validate your suggestion that there was a failure
The product is covered by a tremendous warranty, if you believe the problem with port VLAN assignments fail, please have a chat to the good folk at the Small Business support Center. www.cisco.com/go/sbsc
let them look at the GUI or CLI config at the time and if there really is an issue let them resolve the issue.
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