Configuring Layer 2.5 VPNs

Layer 2.5 VPNs are an extension to Layer 2 VPNs. The main difference is that Layer 2.5 VPNs are not required to have the same media on both ends of the connection. In general, Layer 2.5 VPNs combine the capabilities of TCC with Layer 2 VPNs.

Layer 2.5 VPNs support the same media types as TCC: ATM, Cisco HDLC, Ethernet, extended VLAN, Frame Relay, and PPP. They support IPv4, IS-IS, and MPLS traffic types, but do not support IPv6 traffic.

Although not covered in this manual, you can also use TCC in conjunction with Layer 2 circuits to connect two CE sites that use different Layer 2 protocols. You can use these so-called Layer 2.5 circuits as an alternative to Layer 2.5 VPNs. For more information about Layer 2 circuits, see Layer 2 Circuits or the JUNOS VPNs Configuration Guide.

To configure Layer 2.5 VPNs, complete the following tasks:

• Configuring the Encapsulation on Interfaces Participating in the Layer 2.5 VPN
• Configuring the Layer 2.5 VPN
• Option: Configuring ISO or MPLS Traffic on T-series and M320 Routers

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