| 摘要 |
This application provides a method for implementing a Layer 3 virtual private network (L3VPN) and an apparatus, where the method includes: receiving, by a first PE, an attachment notification packet sent by a first terminal device, where the attachment notification packet carries an IP address of the first terminal device, the attachment notification packet is used to notify the first PE that the first terminal device attaches to a first site, and the first site attaches to an L3VPN by using the first PE; obtaining, by the first PE, an IP address of a second PE according to the IP address of the first terminal device and an ID of a VPN associated with an interface receiving the attachment notification packet, where a second site attaches to the L3VPN by using the second PE, and the first terminal device attaches to the second site before attaching to the first site; obtaining, by the first PE, an IP address of a second terminal device according to the IP address of the second PE and the ID of the VPN associated with the interface receiving the attachment notification packet, where the IP address of the second terminal device is different from the IP address of the first terminal device, and the second terminal device attaches to the second Site; and sending, by the first PE, a binding update notification packet to the first terminal device, where the binding update notification packet carries a MAC address of the first PE and the IP address of the second terminal device. |
