Terms and Acronyms

• Circuit cross-connect (CCC)—A method of exchanging frames between two router interfaces running the same Layer 2 protocol, such as ATM, Cisco HDLC, Ethernet, extended VLAN, Frame Relay, and PPP. For more information about CCC, see the JUNOS Internet Software Network Interfaces and Class of Service Configuration Guide.
• Translational cross-connect (TCC)—A Juniper Networks method of exchanging frames between two router interfaces running different Layer 2 protocols, such as ATM, Cisco HDLC, Ethernet, extended VLAN, Frame Relay, and PPP. For more information about TCC, see the JUNOS Internet Software Network Interfaces and Class of Service Configuration Guide.
• Layer 2.5 VPNs—A method of privately connecting sites across the Internet. Layer 2.5 VPNs function like Layer 2 VPNs, but connect two sites that use different Layer 2 protocols. For more information about Layer 2 VPNs, see the JUNOS Internet Software VPNs Configuration Guide.
• Layer 2.5 circuits—A method of privately connecting sites across the Internet. Layer 2.5 circuits function like Layer 2 circuits, but connect two sites that use different Layer 2 protocols. For more information about Layer 2 circuits, see Layer 2 Circuits or the JUNOS Internet Software VPNs Configuration Guide.
• Provider Edge router (PE)—Any router that connects customer edge (CE) routers to the provider core network.
• Customer Edge router (CE)—Any router that connects a customer site to a PE router.
• Provider core router (P)—Any router that lies between PE routers in the provider core network.