What the diffrence between AR router MAC address of the bridge and ordinary MAC address

The MAC address of the bridged virtual interface (BVI) of a bridge on an AR router can be modified.
You can run the mac-address command in the Bridge-if interface view to modify the MAC address of the current bridged virtual interface.
The MAC address of a bridged virtual interface is the system MAC address, which may conflict with the MAC addresses of other interfaces or virtual interfaces. If the MAC address of a bridged virtual interface conflicts with the MAC addresses of member interfaces of the bridge group, the bridged virtual interface cannot transmit traffic in Layer 3.
When configuring a bridged virtual interface, confirm whether the MAC address of the interface conflicts with the MAC addresses of the member interfaces of the bridge group. If the MAC addresses conflict, you can run the mac-address command to modify the MAC address of the Bridge-if interface.
After the MAC address of the bridged virtual interface is modified, the device proactively sends a free ARP to update the ARP entries on the peer device.

The MAC address of a bridge on an AR router equals to a normal MAC address. A bridge bridges complete Layer-2 Ethernet packets.

The two types of MAC addresses have the same functions. Packets bridged by network bridges are complete Ethernet Layer 2 packets.

Both types of media access control (MAC) addresses are saved as static MAC addresses on devices. However, static MAC addresses and sticky MAC addresses have difference origins. Static MAC addresses are created manually, while sticky MAC addresses are converted from valid dynamic MAC addresses after the sticky MAC address is enabled on an interface. Static MAC addresses and sticky MAC addresses are stored on an AR and are not aged. Static MAC addresses are manually configured, and sticky MAC addresses are converted by dynamic MAC addresses when the sticky MAC function is enabled on an AR. Static MAC addresses and sticky MAC addresses are stored on an AR and are not aged. Static MAC addresses are manually configured, and sticky MAC addresses are converted by dynamic MAC addresses when the sticky MAC function is enabled on an AR.

On a network where security requirements for user access are high, configure the interface security function on the router to enable the MAC addresses learnt by an interface to be converted to secure MAC addresses. If the maximum number of MAC addresses that can be learnt by a router reaches the upper limit, the router does not learn new MAC addresses and allows communication with the devices of only these MAC addresses. This can prevent untrusted users from communicating with the router over this interface and improve device and network security. For details about the function and its configuration procedure, choose Configuration Guide (via Command Line)> Security> Port Security Configuration through the URL: Product documentation."