User Manual

S350 Series 24-Port (PoE+) and 48-Port Gigabit Ethernet Smart Switches
Configure Switching User Manual116
14. In the Frame Size (1500 to 9198) field, specify the maximum Ethernet frame size that each
interface can support.
The frame size includes the Ethernet header, CRC, and payload. The range is 1500 to
9198. The default maximum frame size is 1500.
15. From the Flow Control menu, select the configuration for IEEE 802.3 flow control.
• Disable. If the port buffers become full, the switch does not send pause frames, and
data loss could occur. This is the default setting.
• Symmetric. If the port buffers become full, the switch sends pause frames to stop
traffic.
Flow control helps to prevent data loss when the port cannot keep up with the number
of frames being switched. When you enable flow control, the switch can send a pause
frame to stop traffic on the port if the amount of memory used by the packets on the
port exceeds a preconfigured threshold and responds to pause requests from partner
devices. The paused port does not forward packets for the time that is specified in the
pause frame. When the pause frame time elapses, or the utilization returns to a
specified low threshold, the switch enables the port to again transmit frames. The
switch also honors incoming pause frames by temporarily halting transmission.
• Asymmetric. If the port buffers become full, the switch does not send pause frames,
and data loss could occur. However, the switch does honor incoming pause frames by
temporarily halting transmission.
Note: For LAG interfaces, flow control mode is displayed as a blank field
because flow control is not applicable.
16. Click the Apply button.
Your settings are saved.
The following table describes the nonconfigurable data that is displayed.
Table 27. Port Configuration information
Field Description
Port Type For normal ports this field is blank. Otherwise, the options are as follows:
• Mirrored. The port is a mirrored port on which all the traffic is copied to
the probe port.
• Probe. Use the port to monitor a mirrored port.
• Trunk Member. The port is a member of a link aggregation trunk. Look
at the LAG pages for more information.
Physical Status The port speed and duplex mode.
Link Status Indicates whether the link is up or down.
MAC Address The physical address of the specified interface.