Basic Switch Functions; Switching Mode; Mac Address Table Management - Fujitsu XG2000 Series User Manual

XG2000 series User's Guide

4.1 Basic Switch Functions

This section describes the basic switch functions.

4.1.1 Switching Mode

The device provides the following two switching modes.
Store-and-forward switching mode
After the device finishes receiving a frame, it checks the FCS (Frame Check Sequence) and
performs a validity check (on packet size, etc.) before forwarding the frame. If the switch
receives a frame with an error frame, it discards it.
Cut-through switching mode
The device transmits the frame to the destination as soon as the first 64 bytes of the frame
are received with no errors. Since the device starts transmitting the frame before it receives
the entire frame, this mode allows forwarding at low latency.
To change the switching modes, carry out the following procedures in the administrator EXEC mode.
xg# configure terminal
xg(config)# bridge forward-mode
{cut-through | store-and-forward }
xg(config)# no bridge forward-mode
xg(config)# exit

4.1.2 MAC Address Table Management

The MAC address table is a database used for managing the association between address information and destination ports.
The device can learn up to 16384 entries of MAC addresses.
MAC address table management
The device has two methods for MAC address table management.
−
−
To change the MAC address table management modes, carry out the following procedures in the
management EXEC mode.
xg# configure terminal
xg(config)# bridge learn-mode { ivl | svl }
xg(config)# no bridge learn-mode
xg(config)# exit
xg# copy running-config startup-config
xg# reset
Dynamic MAC address learning
The device dynamically learns MAC addresses from received frames. If MAC addresses are not
refreshed before the aging time expires, they will be removed from the MAC address table.
To disable the dynamic learning, carry out the following procedures in the administrator
EXEC mode.
xg# configure terminal
xg(config)# interface port 1 2 3
xg(config)# interface port range 1 3
xg(config-if)# suppress-address-learning
xg(config-if)# no
suppress-address-learning
xg(config-if)# exit
xg(config)# exit
Command
SVL(Shared VLAN Learning)
The device learns MAC addresses common to all VLANs. Different VLANs with identical
MAC addresses are treated as identical entries.
IVL(Independent VLAN Learning)
The device learns MAC addresses separately for each VLAN. Identical MAC addresses with
different VLANs are treated as separate entries.
Command
Command
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Switch to global configuration mode.
Select the cut-through (or store-and-forward) for the
switching mode.
Exit to administrator EXEC mode.
Switch to the global configuration mode.
Select IVL or SVL for the MAC address table management
mode.
Exit to administrator EXEC mode.
Save the current settings of the device to nonvolatile memory.
If the MAC address table management mode is changed, the
new setting becomes enabled after the device is restarted.
Switch to global configuration mode.
Switch to the interface edit mode to specify the port(s) to be
configured.
In this example, the global interface configuration mode is
selected for ports 1 through 3.
Enable (or disable) the dynamic MAC address learning.
Exit to global configuration mode.
Exit to administrator EXEC mode.
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