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Pseudowire Overview for ACX Series Universal Access Routers

A pseudowire is a Layer 2 circuit or service, which emulates the essential attributes of a telecommunications service— such as a T1 line, over an MPLS packet-switched network. The pseudowire is intended to provide only the minimum necessary functionality to emulate the wire with the required degree of faithfulness for the given service definition. On the ACX Series routers, Ethernet, Asynchronous Transfer Mode (ATM), and time-division multiplexing (TDM) pseudowires are supported. The following pseudowire features are supported:

• Pseudowire transport service carrying Layer 1 and Layer 2 information over an IP and MPLS network infrastructure. Only similar end points are supported on the ACX Series—for example, T1 to T1, ATM to ATM, and Ethernet to Ethernet.
• Redundant pseudowires backup connections between PE routers and CE devices, maintaining Layer 2 circuits and services after certain types of failures. Pseudowire redundancy improves the reliability of certain types of networks (metro for example) where a single point of failure could interrupt service for multiple customers. The following pseudowire redundancy features are supported:
  • Maintenance of Layer 2 circuit services after certain types of failures with a standby pseudowire, which backs up the connection between PE routers and CE devices.
  • In case of failure, a protect interface, which backs up the primary interface. Network traffic uses the primary interface only so long as the primary interface functions. If the primary interface fails, traffic is switched to the protect interface.
  • Hot and cold standby enabling swift cut over to the backup or standby pseudowire.
• Ethernet connectivity fault management (CFM), which can be used to monitor the physical link between two routers. The following major features of CFM for Ethernet pseudowires only are supported:
  • Connection protection using the continuity check protocol for fault monitoring. The continuity check protocol is a neighbor discovery and health check protocol that discovers and maintains adjacencies at the VLAN or link level.

  • Path protection using the linktrace protocol for path discovery and fault verification. Similar to IP traceroute, the linktrace protocol maps the path taken to a destination MAC address through one or more bridged networks between the source and destination.