Key Concepts and Benefits of BGP-Signaled Layer 2 VPNs

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BGP-signaled Layer 2 VPNs (L2 VPNs) are a type of virtual private network that enables the extension of Layer 2 networks across a service provider network. Here are the correct statements regarding BGP-signaled Layer 2 VPNs:

A. You must enable the Layer 2 VPN signaling NLRI.

The Network Layer Reachability Information (NLRI) is used to exchange information about VPNs between BGP peers. To establish a BGP-signaled Layer 2 VPN, the Layer 2 VPN signaling NLRI must be enabled.

B. You must configure the virtual circuit identifier.

The virtual circuit identifier (VCI) is used to identify the connection between the provider edge (PE) devices. Each L2 VPN has a unique VCI, which is used to differentiate between multiple L2 VPNs on the same PE device. The VCI must be configured on both the ingress and egress PE devices.

C. You must specify the neighbor using the tunnel endpoint IP address.

To establish a BGP-signaled L2 VPN, the PEs must be able to establish a tunnel between them. The tunnel endpoint IP address is used to specify the neighbor that the tunnel should be established with. The tunnel can be established using various technologies such as MPLS, GRE, or IPsec.

D. You must define a unique site-identifier value.

The site-identifier value is used to differentiate between multiple sites that are part of the same L2 VPN. The site-identifier value must be unique within the L2 VPN. This value is used to distinguish between multiple endpoints connected to the same PE device.

In summary, to establish a BGP-signaled L2 VPN, you need to enable the Layer 2 VPN signaling NLRI, configure the VCI, specify the neighbor using the tunnel endpoint IP address, and define a unique site-identifier value.