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16 MAC Address Learning
Trigger
Route switched by the Ring
Protocol
Primary port and secondary
port switched due to
uplink/redundancy
functionality
#1
Downed ports such as those that are down due to a line failure, execution of the
inactivate
command.
#2
Downed channel groups such as those that are down due to the LACP, a line failure,
or the settings in the
16.1.6 Notes
(1) Restrictions regarding move detection for MAC address learning
In a model that accommodates 48 or more Ethernet interface ports, when a terminal such
as a PC moves between ports, the MAC address learned on the previous port might be
kept in the MAC address table.
In such cases, because attempts are made to send frames to the previous port,
communication might not be performed correctly.
If this problem occurs, either wait for the previous port to be deleted by learned entry aging,
or use the
the previous port.
(2) Restrictions regarding unicast transmission
With models that accommodate 48 or more of Ethernet interface ports, if terminals
connected to ports 1 to 24, 49, or 50 are communicating using unicasts and one of those
terminals receives unicast communication from a terminal connected to ports 25 to 48, the
frames in the communication might be flooded to part of the VLAN.
The flooding disappears when either a multicast or broadcast is sent from the destination
terminal, or when bidirectional communication is performed.
(3) Aging time when the Layer 2 authentication functionality is used
The aging time for learned entries can be set by the configuration. When the Layer 2
authentication functionality is used, however, the following aging time is applied.
Table 16-4 Aging time when the Layer 2 authentication functionality is used
Setting of Layer 2 authentication
244
Description
"The Switch runs as a transit node."
The MAC address table is cleared when the flush control frame sent from
the master node when the path is switched is received.
The MAC address table is cleared when the maintenance time for
waiting for the flush control frame times out.
When the multi-fault monitoring functionality is enabled, if receiving flush
control frames sent from a shared node when switching to or switching
back from a backup ring, the MAC address table is cleared.
The MAC address table is cleared when the flush control frame sent on
switching from the primary port to the secondary port or on switching
back from the secondary port to the primary port is received.
operation command, or the settings in the
shutdown
clear mac-address-table
Setting of the aging time for the
MAC address table
configuration command.
operation command to delete the learned entry for
configuration
shutdown
Aging operation
Operat
Aging time
ion
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