Is Layer 3 Required to Route Traffic Between VLANS?

[shaynegw]

Hi

I'm not sure how to configure a new VLAN on my Cisco SG300-10 switch. I want to create a new VLAN (192.168.2.x) for AV and Security devices on port 2 of my switch. I can find directions for creating the VLAN, but what I can't tell is if I need to change my switch to Layer 3 addressing, or if there is a way to enable open (promiscuous?) communications between the 2 LANS or if static routing is required.

Any advice or tutorials?

Thanks and take care,

Shayne

[Seb Rupik]

Hi there,

Yes you need ip routing enable for inter-VLAN communication on the switch. The command you need is:

!
set system mode router
!

This will clear your existing configuration and require a reboot.

cheers,

Seb.

[shaynegw]

Hi

If I enable L3 will I lose all my settings (LAGs, trunking, etc) and if so is there a way to back them up and restore them after?

Take care,

Shayne

[Seb Rupik]

Yes, you will start with a black config after the reboot.

Take a look at the admin guide regarding taking a backup config:

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

...page 43

Take care that reloading a backup may reinstate the 'switch' mode. you are better off opening the backup config in a text editor and then pasting your Layer configurations back into the terminal.

cheers,

Seb.