VLAN Reset After Access Point Restart

[BlaxWalker]

Hi All,

First of all, sorry for my bad English and my dumb networking knowledge.

I have some SG300-28PP switch with some VLAN for each building let say VLAN 1 (default) and VLAN 25. For some port, I set it 25UP (untagged PVID) to accommodate my Aironet AP and other SG350 switch (with static IP segment 25) which is connected to those port.

Until now I still wondering, why the VLAN on those port get reset to default VLAN 1 (1UP, 25T) after access point or switch SG350 got reboot because of power loss. The AP is smart enough to looking for DHCP address on segment 1 so it can be functional again, but not for the switch SG350 which still have static IP segment 25 and can not be pingable. I also find that this case was not happen when those port is not connected with non-Cisco devices at the end point. It still stay at 25UP even after the non-Cisco device is restarted due the power loss.

My question, how to make those port stay at 25UP when they have Cisco devices connected to it, and stay at 25UP after the Cisco devices has been restarted?

Thank you very much for your help...

[Georg Pauwen · Accepted solution]

Hello,

two things:

1. Make sure that all smartport macros are disabled. You can either do this from the command line:

conf t

macro auto disable

!

interface range gigabitethernet1-24

no macro auto smartport

of from the GUI (page 61 of the attached user guide).

Also make sure you are running the latest firmware (1.4.8.06).

https://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/sf30x_sg30x/administration_guide/78-19308-01.pdf

[BlaxWalker]

Hi George,

Thank for mentioning smartport. I've configure it last week and the VLAN seems successfully persistent. I will update this thread once i found another anomaly...