Layer 2 interoperation feature of the access network

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After the Layer 2 interoperation feature is enabled, users connected to the same access device can exchange data at the Layer 2 network.

Other related questions:
How to configure an Ethernet interface to access the external network
Service interfaces fall into two types: 1. LAN interface (Layer 2 interface): is used by an AR to exchange data with network devices on a LAN. 2. WAN interface (Layer 3 interface): is used by an AR to exchange data with external network devices. You can run the portswitch command to switch a Layer 2 interface to a Layer 3 interface, to implement data exchange with the external network.

What are the differences in APs' Layer 2 and Layer 3 access to ACs
- In Layer 2 access mode, an AP broadcasts a probe frame to discover ACs. - In Layer 3 access mode, an AP discovers ACs using DHCP Option 43 or DNS. a) When Option 43 is used, an AP obtains an AC's IP address when the AP obtains its own IP address. Then

ARP proxy feature of the access network
When a PC sends an Address Resolution Protocol (ARP) request to another PC, the request is processed by the access device connected to the 2 PCs. This process is called ARP proxy. ARP proxy is often used for communication between the sub virtual local area networks (VLANs) in a super VLAN.

Layer 2 transparent transmission mechanism for 802.1x protocol packets on S series switches
For S series switches (except the S1700), the Layer 2 transparent transmission mechanism for 802.1 protocol packets is as follows: 1. When an 802.1x protocol packet reaches the ingress node, the switch changes the multicast destination MAC address of the packet to a specified multicast MAC address. 2. After the MAC address of an 802.1x protocol packet is changed, the switch does not send the packet to the CPU for processing but directly forwards the packet on the Layer 2 network based on the configuration. 3. When the 802.1x protocol packet reaches the egress node, the switch restores the multicast destination MAC address of the packet to the standard multicast destination MAC address based on the mapping between the specified multicast destination MAC address and the 802.1x protocol configured on the switch.

What cautions should be taken when configuring a Layer 2 access network between APs and the gateway on a WLAN
All downlink ports connected to APs on access and aggregation switches must be isolated from each other. If a packet transport network (PTN) is deployed between APs and the gateway, use leased lines but not a private network.

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