Cisco 350 Series Administration Manual page 22

Quick Getting Started
Out-Of-Band Port
!
CAUTION
Out-Of-Band Port
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
Make sure that any configuration changes made are saved before exiting.
You are now ready to configure the switch. See the CLI Guide for your switch.
If you are not using DHCP on your network, set the IP address type on the switch
NOTE
to Static and change the static IP address and subnet mask to match your network
topology. Failure to do so may result in multiple switches using the same factory default
IP address of 192.168.1.254.
OOB is only supported on SG350XG/SX350X and SG550XG/SX550X devices.
The switch supports an Out-of-Band (OOB) port. This port is used for the management
network. The out-of-band and the in-band ports share the same IP routing table, therefore you
cannot use the same subnet on both in-band and out-of-band interfaces.
The OOB port is assigned an MAC address which is different from the base MAC
address and the addresses of the in-band ports. This MAC address is used as the
source MAC address in all frames (including IP frames) sent by the switch on the
OOB port.
The IP address assigned to this port cannot be assigned to the in-band ports at the same time.
In addition, the IP address assigned to the OOB port must not belong to any IP subnet
configured at the in-band interfaces of the devices.
By default, the OOB port is configured with the default IP address 192.168.1.254. This default
IP address is used when no other address was assigned (dynamically or statically). This sub net
is a reserved one and cannot be assigned on the in-band interfaces.
Bridging
Bridging between the OOB port and the in-band Layer 2 interfaces is not
supported. The OOB port cannot be a member of VLAN or LAG, and the bridge's
protocols (for example, STP, GVRP, etc.) cannot be enabled on the OOB port.
Only untagged traffic is supported on the OOB port.
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