Is the scanned air interface MAC address of the SSID sent by Huawei APs in multicast node the same as the AP's MAC address

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No, the scanned air interface MAC address of the SSID sent by Huawei APs in multicast mode is self-originated according to certain parameters including the carrier ID and device ID, and differs from the AP's MAC address, which ensures global uniqueness of the SSID.

Other related questions:
Is the MAC address of an SSID broadcast by a Huawei AP the same as the AP's MAC address
The MAC address of an SSID broadcast by a Huawei AP is automatically generated based on parameters such as the carrier ID and AP ID, which ensures that the uniqueness of the MAC address. Therefore, the MAC address is different from that of the AP. MAC address calculation rule: The basic service set identifier (BSSID) is used to uniquely identify an AP and the BSSID format is the same as that of the MAC address, that is, XXXX-XXXX-XXXX. If an AP has only one SSID, the BSSID is the AP's MAC address. A Huawei AP supports multiple VAPs, each of which has a unique BSSID. If the BSSID of each VAP uses the AP's MAC address, duplicate BSSIDs exist. An algorithm is adopted to ensure that the BSSID of each VAP is unique and associated with the AP's MAC address. The following takes a dual-band AP's MAC address dcd2-fc01-1b40 as an example. Generally, each frequency band supports 16 VAPs. The algorithm of VAPs' BSSIDs is as follows: 1. On radio 0, the BSSID of the first VAP is the AP's MAC address. The BSSIDs of the subsequent VAPs are incremented by 1 on the previous BSSIDs. 2. On radio 1, the BSSID of the first VAP is obtained by adding 1 to the last but one bit of the AP's MAC address. The BSSIDs of the subsequent VAPs are incremented by 1 on the previous BSSIDs. For example, if the AP's MAC address is dcd2-fc01-1b40, the BSSID of the first VAP on radio 1 is dcd2-fc01-1b50. 3. On radio 2, the BSSID of the first VAP is obtained by adding 2 to the last but one bit of the AP's MAC address. The BSSIDs of the subsequent VAPs are incremented by 2 on the previous BSSIDs. For example, if the AP's MAC address is dcd2-fc01-1b40, the BSSID of the first VAP on radio 2 is dcd2-fc01-1b60.

An AP's MAC address conflicts with that of another AP
When an AP's MAC address conflicts with that of another AP, check whether the set system-mac command is supported in the diagnostic view of the AP. If so, the MAC address can be changed. Run the set system-mac command to change to the AP's MAC address. If the set system-mac command is not supported, change the MAC address of another AP.

Why is the MAC address of a BPDU replaced with a multicast MAC address in BPDU tunneling on S series switches
On S series (except the S1700) and E series switches, the MAC address of a BPDU from a user-side device is replaced so that the BPDU can be transparently transmitted across the ISP network. Otherwise, the BPDU will be processed by the ISP network as a protocol packet and cannot reach the remote user-side device, and network flapping will occur.

What are the differences between static MAC addresses and sticky MAC addresses
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.

Why is the MAC address of a BPDU replaced by a multicast MAC address in BPDU tunneling
The MAC address of a BPDU from a user-side device is replaced so that the BPDU can be transparently transmitted across the carrier network. Otherwise, the BPDU will be processed by the carrier network as a protocol packet and cannot reach the remote user-side device, and network flapping will occur. According to the implementation of BPDU tunneling, the MAC address of a BPDU can be replaced by a multicast, broadcast, or unicast address. The reason why a case-shaped switch selects a multicast MAC address is as follows: If the MAC address of a BPDU is replaced by a broadcast MAC address, the BPDU may be attacked when being transparently transmitted because a broadcast packet is vulnerable to attacks. If the MAC address of a BPDU is replaced by a unicast MAC address, the switch may be unable to learn the source MAC address of the BPDU when forwarding it and still processes it as a broadcast packet.

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