Hi there!
This time, I will share with you the basic concept for the E-LAN service.
VSI
After an E-LAN service is created, the PTN equipment creates a virtual switching instance (VSI) for the service and binds all the points that need to communicate with each other to the VSI. These points are called VSI leaf nodes. A VSI leaf node can be a virtual user-to-network interface (V-UNI), PW, QinQ link, or an Ethernet port. VSIs are separated from each other, forming virtual private networks.
MAC address forwarding table
The PTN equipment supports the following modes of MAC address learning and forwarding:
Independent VLAN Learning (IVL) mode: The PTN equipment considers both the MAC addresses and VLAN IDs of service packets when learning the MAC address forwarding table entries or forwarding service packets.
Shared VLAN Learning (SVL) mode: The PTN equipment considers only the MAC addresses of service packets when learning the MAC address forwarding table entries or forwarding service packets.
In IVL mode, the PTN equipment queries the MAC address forwarding table based on the destination MAC address and VLAN ID of a received service packet and forwards the service packet to the corresponding VSI leaf node. In the MAC address forwarding table, each MAC address forwarding table entry specifies the MAC address, VLAN ID, and the corresponding egress port (VSI leaf node). The MAC address forwarding entries can be statically configured by users or dynamically learned by the PTN equipment. In the dynamic learning mode, the PTN equipment records the source MAC address, VLAN ID, and ingress VSI leaf node of a received service packet as a MAC address forwarding table entry.
In SVL mode, the PTN equipment queries the MAC address forwarding table based on the destination MAC address of a received service packet and forwards the service packet to the corresponding VSI leaf node. Each MAC address forwarding table entry specifies the MAC address and the corresponding egress port (VSI leaf node). The MAC address forwarding table entries can be statically configured by users or dynamically learned by the PTN equipment. In the dynamic learning mode, the PTN equipment records the source MAC address and ingresses the VSI leaf node of a received service packet as a MAC address forwarding table entry.
Split horizon group
To prevent E-LAN service forwarding paths from forming a loop and consequently causing a broadcast storm, you can group some VSI leaf nodes on specific PTN equipment into a split-horizon group. Leaf nodes in the same split-horizon the group cannot forward service packets to each other. leaf nodes A and B are grouped into the same split-horizon group. They cannot forward service packets to each other.
That's all, I welcome everyone to leave a message and exchange in the comment area!
Thank you！
