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#MAC MOVE NOTIFICATIONS TO SECOND MONITOR MAC#The output of "Number of MAC Addresses moved" suggests that, the switch is experiencing mac-moves. The dynamic MAC learning will be disabled by the switch, in order to protect the control-plane.Īt this point, you may want to check the mac-move count to understand, if and how many mac-moves have been experienced on the device, N9K# sh mac address-table notification mac-move The switch has a mechanism to count the number of MAC "move-backs" and weigh them based on the number of times the MAC address moves. Basically, the switch received frames with the same source MAC on two or more interfaces at a very high rate. When we have continuous mac moves in the environment, these messages could be seen. These messages are indicative of an event in the mac table. However, in case these movements are high, we will end up seeing the following logs - 2018 Nov 14 15:53:26.943 N9K %-SLOT1-5-BCM_L2_LEARN_DISABLE: MAC Learning Disabled unit=0Ģ018 Nov 14 15:53:27.769 N9K %-SLOT1-5-BCM_L2_LEARN_ENABLE: MAC Learning Enabled unit=0Ģ018 Nov 14 15:53:27.863 N9K %-SLOT1-5-BCM_L2_LEARN_DISABLE: MAC Learning Disabled unit=0Ģ018 Nov 14 15:53:28.770 N9K %-SLOT1-5-BCM_L2_LEARN_ENABLE: MAC Learning Enabled unit=0 By default, on Nexus9K, you may not see the logs, which specifically tells us that the switch is experiencing mac-moves. It could be caused if there are too many mac-moves/flaps/loops or new mac learns/moves exceeds a certain threshold. When BCM ASIC learns too many mac-addresses in a short duration, BCM_USD will disable/enable MAC learning in hardware and you can see below message coming up. Troubleshoot Layer 2 switching issues Topology +-+ Po6 +-+ Understanding of the concept of mac-learning on the switch and NX-OS configuration Under loop condition, it may so happen that the same MAC is learnt via two different ports on the switch. We understand the concept of mac learning and how a table is maintained on a switch, when it switch receives a frame, and associates the MAC address of the sender with the LAN port where it was received. #MAC MOVE NOTIFICATIONS TO SECOND MONITOR HOW TO#See Change Notifications preferences.This document explains how to troubleshoot when there is mac move on Nexus 9000 2018 Nov 14 15:53:26.943 N9K %-SLOT1-5-BCM_L2_LEARN_DISABLE: MAC Learning Disabled unit=0Ģ018 Nov 14 15:53:27.769 N9K %-SLOT1-5-BCM_L2_LEARN_ENABLE: MAC Learning Enabled unit=0 Your choices are saved in Notifications preferences, which you can change at any time. The first time you receive a time-sensitive or critical notification, you’re asked to allow or not allow these notifications when a Focus is active. Notifications from some apps, such as Calendar or Reminders, can be time sensitive for other apps, such as Home, they can be critical. In some apps, the first time you open it you’re asked to choose whether or not you want to receive notifications from it. When you mute notifications, they aren’t shown and don’t play a sound when they arrive.Ĭlear a single notification or all notifications in a stack: Click the Clear or Clear All button. Mute, unmute, turn off, or change an app’s notification settings: If an arrow is shown to the right of the app name, click the arrow, then click the More button. If an arrow is shown to the right of the app name, click the arrow to show details in the notification. See more details: Click the notification to open the item in the app. Or in a notification from the Calendar app, click Options, then choose a Snooze duration. For example, in a notification from the News app, click Read Story. Take an action: Click the action or click Options. To collapse the stack, click “Show less.” To expand the stack and show all of the notifications, click anywhere in the top notification. On your Mac, move the pointer over a notification, then do any of the following:Įxpand or collapse a stack of notifications: If an app’s notifications are grouped, multiple notifications are stacked. Connect a wireless keyboard, mouse, or trackpad.Get started with accessibility features.Use Sign in with Apple for apps and websites. ![]() ![]()
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