Generating Syslog Error Messages - Cisco Nexus 3000 Series Configuration Manual

Configuring STP Extensions
The logic for MAC-move notifications should be noted. It is possible to notify MAC-moves when the
MAC-address-table notification for MAC-moves is enabled. This adds notification logs on the console but
no action is taken. A move is declared when a given MAC address has moved three times back and forth
across a given pair of ports on a VLAN within an aging scan period of 10 seconds.
Note The MAC address has to be detected 50 times on each of the 2 ports.
You can enable MAC-move notification on the switch to find out which MAC addresses move.
Procedure
Step 1
Step 2

Generating Syslog Error Messages

It is not always sufficient to enable the MAC-move notification in order to generate a syslog message about
MAC-move notification. In order to ensure syslog message generation, enter these commands in conjunction
with the previous command: mac address-table notification mac-move.
Procedure
Step 1
Step 2
Step 3
Step 4
The addition of these commands ensures that the syslog for FWM detect displays when there is a MAC address
move. In order to verify the STP port state across VLANs on the switches, enter the following commands.
switch# show spanning-tree
switch# show spanning-tree vlan <id>
switch# show spanning-tree internal interaction
In order to check if the MAC addresses move, enter the command:
# show mac address-table notification mac-move
MAC Move Notify Triggers: 1206
OL-29545-03
Command or Action
switch# conf t
switch# mac address-table notification
mac-move
Command or Action
conf t
logging level spanning-tree 6
logging level fwm 6
logging monitor 6
Cisco Nexus 3000 Series NX-OS Layer 2 Switching Configuration Guide, Release 6.x
Generating Syslog Error Messages
Purpose
Enters the configuration mode.
Enables MAC-move notification on the
switch.
Purpose
Enters the configuration mode.
Enables logging of all spanning-tree events from level 6
up to the highest severity events.
Enables logging of all FWM events from level 6 up to the
highest severity events.
Enables the device to log messages to the monitor based
on severity level 6 or higher.
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