Maintenance Manual

Managing the System

Administration

Cisco Small Business NSS300 Series Smart Storage Administration Guide 65

Jumbo Frame Settings (MTU)

Jumbo Frames refer to Ethernet frames that are larger than 1500 bytes. Jumbo

Frames are designed to enhance Ethernet networking throughput and reduce the

CPU utilization of large file transfers by enabling more efficient, larger payloads

per packet. Maximum Transmission Unit (MTU) refers to the size (in bytes) of the

largest packet that a given layer of a communications protocol can transmit.

The NAS uses standard Ethernet frames, which are 1500 bytes by default. If your

network appliances support Jumbo Frame setting, select the appropriate MTU

value for your network environment. The NAS supports 4074, 7418, and 9000

bytes for MTU.

NOTE Jumbo Frame setting is valid in a Gigabit network environment only.

Also, all network appliances connected must enable Jumbo Frame and use

the same MTU value.

• Select Jumbo Frame Setting—From the drop-down list, select the MTU

value for your network. The NAS supports 4074, 7418, and 9000 bytes for

MTU.

STEP 3 Click Apply to save the settings.

NOTE If the NAS administration interface cannot be accessed due to an improperly

configured Jumbo Frame setting or incompatible switch, reset the network settings

by pressing the reset button on the back panel of the NAS for 3 seconds.

VLAN (Virtual LAN)

Virtual LAN, known as a VLAN, is a group of hosts with a common set of

requirements that communicate as if they were attached to the same broadcast

domain, regardless of their physical location. A VLAN has the same attributes as a

physical LAN, but it allows for devices to be grouped together even if they are not

located on the same network switch. Network reconfiguration can be done

through software instead of physically relocating devices.

The VLAN feature provided by NAS allows the NAS to reside on a specific LAN

segment and only the devices with the same VLAN ID can access the NAS and

communicate with each other. This feature enhances the reliability and security in

network data transmission.