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Juniper Networks® Field Guide and Reference by Juniper Networks®, Cris Morris, Gary Drenan, Aviva Garrett

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Circuit Cross-Connect

Circuit cross-connect (CCC) allows you to configure transparent connections between two circuits, where a circuit can be a Frame Relay DLCI, an ATM VC, a PPP interface, a Cisco HDLC interface, or an MPLS LSP. When CCC is enabled, packets from the source circuit are delivered to the destination circuit with, at most, the Layer 2 address being changed. No other processing—such as header checksums, TTL decrementing, or protocol processing—is done.

CCC circuits fall into two categories: logical interfaces, which include DLCIs, VCs, VLAN IDs, PPP, and Cisco HDLC interfaces; and LSPs. The two circuit categories provide three types of cross-connect:

  • Layer 2 switching—Cross-connects between logical interfaces provide what is essentially ...

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