09-26-2013 06:52 PM
Hi all,
I have a switch SG500 28G POE stackable. See my config below in my switch and this is the corect configuration with no issue.
interface gigabitethernet1/1/2
description Dlink-SW-GSD-4-IPphones-No5
switchport trunk allowed vlan add 20,440
This port has been used for iphone for vlan 20 and 440. Suddenly just when the issue comes, iphone cannot be used and i check the configuration as shown below.
interface gigabitethernet1/1/2
description Dlink-SW-GSD-4-IPphones-No5
Looks like it has been deleted automatically. If you have any idea why this occue it would much appreaciated.
Regards,
Ashraf
Solved! Go to Solution.
09-30-2013 05:06 PM
Hi Mohd, if the configuration is 'disappearing' it is probably because the smart ports over write your configuration which is the likely result you have an upstream device advertising something different.
-Tom
Please mark answered for helpful posts
09-26-2013 07:24 PM
Update: I added it back to this interface same configuration and write memory. Its still occur this issue.
Hope this will be more clear description.
Thank you.
Regards,
Ashraf
09-30-2013 04:55 AM
Try the following commands
interface gigabitethernet1/1/2
description Dlink-SW-GSD-4-IPphones-No5
switchport mode trunk
switchport trunk native vlan id (just to be on safe side)
switchport trunk allowed vlan add 20,440
09-30-2013 05:06 PM
Hi Mohd, if the configuration is 'disappearing' it is probably because the smart ports over write your configuration which is the likely result you have an upstream device advertising something different.
-Tom
Please mark answered for helpful posts
10-02-2013 11:35 PM
Hi Tom,
Bravo. I tried to disable smartport for port gigabitethernet1/1/2 for 3 days and it works.
Thanks a lot.
-ashraf
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