This topic describes how Layer 2 Virtual Private Network (L2VPN) on VLANs works on the Cisco 8000 Series Router, and how to configure VLAN attachment circuits (ACs) for L2VPN services.
The Layer 2 Virtual Private Network (L2VPN) feature enables Service Providers (SPs) to provide Layer 2 services to geographically disparate customer sites.
The configuration model for configuring VLAN attachment circuits (ACs) is similar to the model used for configuring basic VLANs, where the user first creates a VLAN subinterface, and then configures that VLAN in subinterface configuration mode. To create an AC, you need to include the l2transport keyword in the interface command string to specify that the interface is a Layer 2 interface.
VLAN ACs support three modes of L2VPN operation:
Basic Dot1Q AC—The AC covers all frames that are received and sent with a specific VLAN tag.
QinQ AC— Only outer tag (s-tag) of 0x88a8 and inner tag (c-tag) of 0x8100 is supported.
Cisco IOS XR software supports 255 ACs per LC when you configure L2VPN on a VLAN.
Use the show interfaces command to display AC information.