verify data plane connectivity. If the ping fails, traffic is automatically switched to the
redundant pseudowire.
When a failure is detected, traffic is switched from the failed active pseudowire to the
redundant pseudowire. The redundant pseudowire is then designated as the active
pseudowire. The switch is nonreversible, meaning that once the redundant pseudowire
assumes the role of the active pseudowire at the time of a failover, it remains as the
active pseudowire even though the previously active pseudowire comes up again.
For example, a primary pseudowire has failed and traffic has been successfully switched
to the redundant pseudowire. After a period of time, the cause of the failure of the primary
pseudowire has been resolved and it is now possible to reestablish the original connection.
However, traffic is not switched back to the original pseudowire unless a failure is detected
on the currently active pseudowire.
Related
Documentation
Example: Configuring H-VPLS Without VLANs•
• VPLS Feature Guide for EX9200 Switches
Configuring Redundant Pseudowires for Layer 2 Circuits and VPLS
A redundant pseudowire can act as a backup connection between PE routers and CE
devices, maintaining Layer 2 circuit and VPLS services after certain types of failures. This
feature can help improve the reliability of certain types of networks (metro for example)
where a single point of failure could interrupt service for multiple customers. Redundant
pseudowires cannot reduce traffic loss to zero. However, they provide a way to gracefully
recover from pseudowire failures in such a way that service can be restarted within a
known time limit.
NOTE: VPLS is not supported on ACX Series routers.
For an overview of how redundant pseudowires work, see “Redundant Pseudowires for
Layer 2 Circuits and VPLS” on page 604.
To configure pseudowire redundancy for Layer 2 circuits and VPLS, complete the
procedures in the following sections:
•
Configuring Pseudowire Redundancy on the PE Router on page 606
•
Configuring the Switchover Delay for the Pseudowires on page 607
•
Configuring a Revert Time for the Redundant Pseudowire on page 607
Configuring Pseudowire Redundancy on the PE Router
You configure pseudowire redundancy on the PE router acting as the egress for the
primary and standby pseudowires using the backup-neighbor statement.
Copyright © 2017, Juniper Networks, Inc.606
ACX Series Universal Access Router Configuration Guide
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