52
Configuring System Information
EdgeSwitch
™
Administration Guide
Ubiquiti Networks, Inc.
Basic Switch Configuration
The forwarding database maintains a list of MAC addresses after having received a packet from this MAC
address. The transparent bridging function uses the forwarding database entries to determine how to
forward a received frame.
Switch Configuration
Use the
Switch Configuration
page to set the amount of time to keep a learned MAC address entry in the
forwarding database, or to enable or disable flow control mode on the switch.
The forwarding database contains both static entries that are never aged out, and dynamically learned
entries that are removed if they are not updated within a specified time interval. The
Switch Configuration
page allows you to specify this time interval for learned entries.
IEEE 802.3x flow control works by pausing a port when the port becomes oversubscribed. It also allows a
port to drop all traffic for small bursts of time during the congestion condition. This can lead to high-priority
and/or network control traffic loss. When enabled, flow control allows lower speed or congested switches to
communicate with higher-speed switches by sending a PAUSE frame to request that the higher-speed switch
refrain from sending packets. Transmissions are temporarily halted to prevent buffer overflows.
To access the
Switch Configuration
page, click
System
>
Basic Configuration
>
Switch
in the navigation menu.
Switch Configuration
Switch Configuration Fields
Field
Description
802.3x Flow Control Mode
Used to
Enable
or
Disable
802.3x flow control on the switch:
•
Disable
The switch does not send PAUSE frames if the port buffers become full.
•
Enable
The switch can send PAUSE frames to a peer device if the port buffers become full.
MAC Address Aging Interval
Used to specify the number of seconds a dynamic address should remain in the MAC address table
after it has been learned.
Note:
IEEE 802.1D recommends a default of
300
seconds, which is the factory default.
Use the buttons to perform the following tasks:
• If you make changes to the page, click
Submit
to apply the changes to the running configuration.
• Click
Refresh
to refresh the page with the most current data from the switch.
To retain the changes across the switch’s next power cycle, click
System
>
Configuration Storage
>
Save
.
