Juniper ACX1000 Configuration Manual page 649

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Copyright © 2017, Juniper Networks, Inc.
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.
Layer 2 Circuits Overview
Redundant Pseudowires for Layer 2 Circuits and VPLS on page 604
Configuring a MEP to Generate and Respond to CFM Protocol Messages
IEEE 802.1ag OAM Connectivity Fault Management Overview
Configuring a CFM Action Profile to Specify CFM Actions for CFM Events
Configuring Interfaces for Layer 2 Circuits
TDM Pseudowires Overview on page 600
ATM Pseudowire Overview on page 173
Ethernet Pseudowire Overview on page 596
Chapter 20: Configuring MPLS and Pseudowires
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