SG-300 switches losing part of config on reboot

[David Travers]

Hi All,

We have around 13 Cisco SG-300 based switches, most of which work fine, however we have a problem with 2 of them.

When these two switches are rebooted they lose the configuration on a few ports, they get reset to a config they were on many months ago.

One of these switches is on firmware 1.3.7.18 and this problem has persisted across several firmware upgrades.

there are no errors in the logs saying they failed to load startup config and when we save running config to startup config there are no errors.

Any thoughts?

[Michal Bruncko]

Hi David

this is very possibly caused by feature called "smartport". I am recommending you to disable it globally and per port basis if you dont use it explicitly for some reason. 

• config t
• macro auto disable
• interface range gi1-20
• no macro auto smartport

Keep in mind, removing these features also removes the auto voice vlan functionality.

more about this topic here.

[David Travers]

Hi Michal,

Yes, smartport is enabled on these switches (in fact all of out SG300 switches).

we don't have a voice vlan so that's ok.

Will it cause any downtime disabling smartport?

Dave

[Michal Bruncko]

The best would be to perform that within maintenance window as the recommendation is to reload switch after applying that configuration.