Changing SG300 from Layer 3 to Layer 2

[mynameismethoz]

Will changing an SG300 switch from Layer 3 to Layer 2 cause any significant user downtime, or any at all?  I have two 52-port SG300's and two 20-port SG300's to make this change to.

[puneelam]

Hi

Whenever you change the mode of operations from one layer to another layer, the switch gets restarted. It takes around 30 seconds to restart.

Thanks

Punith Kumar Neelam

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[Brandon Svec]

From the admin guide p.254:

http://www.cisco.com/en/US/docs/switches/lan/csbms/sf30x_sg30x/administration_guide/78-19308-01.pdf

NOTE Switching from one system mode (layer) to another (on Sx500 devices) requires a

mandatory reboot, and the startup configuration of the device is then deleted.

So, you will want to backup you config, do this in a scheduled maintenance interval and reload the config by hand.

Also realize there may be L3 commands in your config that will not apply in L2 mode.

Good luck!

[trgood · Accepted solution]

Just verified in my lab that move from L3 -> L2 mode will cause a factory default of the device.  You will want to make this change during a prolonged downtime so you can recreate any lost configurations.  I recommend taking a backup as well before you make the change.

-Trent Good

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[mynameismethoz]

Thanks guys for the information, and the heads up about the config.  I'll make a backup config of the settings but if I restore the config I'll be back on level 3 again.  I suppose it won't be all that difficult to just redo the settings by hand and I'll keep the config handy if anything goes wrong.

[robertkwild]

thank you all very much for your help!!!!