Why do two modular switches have the same MAC address

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Each MPU of a switch has a default MAC address. When two MPUs are installed on SwitchA to function as the active and standby MPUs, the standby MPU will automatically use the MAC address of the active MPU as its own MAC address. When the standby MPU is removed from SwitchA and then installed on SwitchB to function as the active MPU of SwitchB, the MAC addresses of SwitchA and SwitchB become the same. You need to restore the default MAC address of the active MPU on SwitchB.

Other related questions:
Do the IP addresses of the two ends of an FR link have to be on the same network segment
If the devices on both ends are AR series routers, the IP addresses do not need to be on the same network segment.

Do all interfaces have MAC addresses

Each Layer 3 Ethernet interface has a MAC address.

A VLANIF interface obtains the device MAC address as its own MAC address. This MAC address is fixed.

A Bridge-if interface obtains the device MAC address as its own MAC address. This MAC address can be changed using the CLI.

The MAC address of a Layer 2 interface has no function on the AR.

NOTE:
  • To change the device MAC address, run the set system-mac { current | default } command in the diagnosis view, save the configuration, and restart the device.

  • The system MAC address to be modified cannot be a multicast MAC address.


On S series modular switches, after a switchover in the CSS, why the system MAC address becomes a single MAC address from multiple MAC addresses
After a CSS is configured to use MAC addresses of the master switch, the system synchronizes the MAC addresses and number of MAC addresses to the candidate standby MPU on the master switch and the system standby MPU of the cluster. Then the system standby MPU synchronizes them to the candidate standby MPU on the standby switch. If the master switch has multiple MAC addresses and the standby switch has a single MAC address, the CSS has multiple MAC addresses. In V200R001, the CSS retains the original cluster MAC address after a switchover, but the number of MAC addresses is equal to the number of MAC addresses on the new master switch. Because the original standby switch has only one MAC address, the CSS has a single MAC address after the switchover. As a result, some services in the CSS may be interrupted or the CSS may be disconnected from the operation terminal or network management system. To prevent this problem, load the latest patch on the V200R001 system software before triggering a switchover. If a switchover has occurred, restart the CSS after loading the patch. You can run the display css system-mac command to check the CSS MAC address.

Can the TE40 have two conferences at the same time?
You cannot hold two conferences on a TE40 at the same time. One endpoint can join only one conference at the same time.

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