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How to troubleshoot Mac move on Nexus 9000?
This document explains how to troubleshoot when there is mac move on Nexus 9000 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.
Why do I not see Mac move logs on nexus9k?
By default, on Nexus9K, you may not see the logs, which specifically tells us that the switch is experiencing mac-moves. However, in case these movements are high, we will end up seeing the following logs – These messages are indicative of an event in the mac table.
When is MAC learning disabled in Cisco NX-OS?
Until Cisco NX-OS Release 6.0 (2)U3 (1), when a loop was detected between two ports, MAC learning was disabled for 180 seconds. However, starting 7.0 (3)I7 (3), we can now configure the switch to bring down the port with the lower interface index, when such a loop is detected by using the ” mac address-table loop-detect port-down ” command.
How to detect MAC address move from one port to another?
To look for this information, we need to raise the logging level of L2FM from the default value of 2 up to 5 on N9K platform. Enter configuration commands, one per line. End with CNTL/Z. In such a case, we can detect and limit the number of times that a MAC address moves from one port to another.
What is the learning mode on Cisco Nexus 7000?
The learning mode is configurable and is set by VLAN mode. The following VLAN modes have the following MAC learning modes: • CE VLANs—Traditional learning by default; you can configure CE VLANs on the F Series module for conversational learning.
Do you need F Series module for Cisco Nexus 7000?
Note You must have an F Series module installed in your Cisco Nexus 7000 Series chassis in order to run FabricPath and conversational learning. This chapter describes how to configure FabricPath switching on the Cisco NX-OS devices.