Configuring The Pseudowire Status Tlv - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
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Configuring the Pseudowire Status TLV

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To reduce as much as possible the amount of traffic discarded, and potential data-path
asymmetries observed during primary-to-backup transition periods, you can use this
restoration timer. This restoration timer is activated when the backup path is performing
as active, and then the primary path is restored. The goal is to avoid moving traffic back
to the primary path right away, to make sure that the control plane's related tasks (such
as IGP, LDP, RSVP, and internal BGP) have enough time to complete their updating cycle.
By enabling a gradual return of traffic to the primary path, you can ensure that the
relatively-slow control-plane processing and updating does not have a negative impact
on the restoration process.
The option extends the revert timer's functionality to provide a jittered interval
maximum
over which a certain number of circuits can be transitioned back to the primary path. By
making use of this maximum value, you can define a time interval during which circuits
are expected to switch over. As a consequence, circuits' effective transitions are scattered
during restoration periods.
When making use of
revert-time x maximum y
corresponding circuit that is active is moved to the primary path within a time-slot (t1)
such as that: x <= t1 <= y. In other words, by activating this statement, you can ensure
the following:
VCs stay in the backup path for at least x seconds after the primary path comes back
up.
VCs are moved back to the primary path before y seconds have elapsed.
y maximum value = x maximum value * 2 = 1200 seconds.
The ideal values for x and y will are conditioned to internal aspects of your network. For
this reason, there are no default values for these settings. If no revert-time is set, the
default behavior is non-revertive. That is, circuits are not returned to the primary path
upon restoration. They are kept on the backup path.
For a list of hierarchy levels at which you can include this statement, see the statement
summary for this statement.
Example: Configuring Pseudowire Redundancy in a Mobile Backhaul Scenario
Example: Configuring H-VPLS Without VLANs
VPLS Feature Guide for EX9200 Switches
The pseudowire status type length variable (TLV) is used to communicate the status of
a pseudowire back and forth between two provider edge (PE) routers. For Layer 2 circuit
configurations, you can configure the PE router to negotiate the pseudowire with its
neighbor using the pseudowire status TLV. The pseudowire status TLV is configurable
for each pseudowire connection and is disabled by default. The pseudowire status
negotiation process assures that a PE router reverts back to the label withdraw method
statement, you can ensure that the
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