Why does the device connected to the S2700SI detect flapping of MAC address 00e0-fc09-bcf9


Only the source MAC address of NDP packets sent by the S2700SI is 00e0-fc09-bcf9. Run the undo ndp enable command in the system view. Then the S2700SI does not send packets with source MAC address 00e0-fc09-bcf9.

Other related questions:
How to configure MAC address flapping detection
To configure MAC address flapping detection, use this following method. [HUAWEI-vlan10] loop-detect eth-loop alarm-only In V200R001 and later versions, run the following command in the system view to enable MAC address flapping detection. [HUAWEI] mac-address flapping detection This function is enabled by default.

Does the switch support MAC-FLAPPING detection
MAC-FLAPPING detection indicates detection of MAC address flapping. The S2700 does not support any modes of MAC-FLAPPING detection. The S2750, S3700, S5700, or S6700 switch supports VLAN-based MAC-FLAPPING detection. The VLAN-based MAC-FLAPPING detection function is disabled by default. Flapping actions can be enabled through command configuration. The actions include blocking ports, blocking MAC addresses, or only reporting alarms after the flapping. For example, configure the command as follows to enable the MAC address flapping detection on VLAN10. In this detection, the action is block with 10s block duration and three attempt times. [HUAWEI] loop-detect eth-loop alarm-only [HUAWEI] vlan 10 [HUAWEI-vlan10] loop-detect eth-loop block-time 10 retry-times 3 In V200R001 and later versions, the switches support globally enabled MAC-FLAPPING detection. The configuration command is as follows: [HUAWEI] mac-address flapping detection Run the mac-address flapping detection in the system view.

After an interface on a CE switch becomes Up during the aging time, will the switch still detect MAC address flapping during the remaining aging time
The default aging time of flapped MAC addresses is 300 seconds. You can run the error-down auto-recovery cause mac-address-flapping interval interval-value command to configure it. After the command is executed, if MAC address flapping stops and the interface becomes Up after the delay, the CE switch no longer detects MAC address flapping during the remaining aging time. This is because the aging time does not expire. If detection on MAC address flapping is required, it is recommended that the delay for an interface to automatically become Up be set greater than the aging time of flapped MAC addresses.

In which situation does MAC address flapping occur on CE switches
MAC address flapping occurs when a MAC address is learned by two interfaces in the same VLAN and the MAC address entry learned later replaces the earlier one. MAC address flapping is usually caused by Layer 2 loops.

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