Optional) Binding An Aps Group To A Bfd Session - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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3.3.4 (Optional) Binding an APS Group to a BFD Session

Context
To monitor an E-APS group, a BFD session monitors an mPW between the working and
protection interfaces on the AC side, and the E-APS group is bound to another BFD session. If
faults occur, the working and protect devices can use BFD to notify each other of the faults,
implementing rapid traffic switchovers between the working and protect devices.
Perform the following steps on the working or protection interface of an APS group:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface interface-type interface-numbercontroller cpos cpos-number
The working interface view or the protection interface view is displayed.
Step 3 Run:
aps track bfd-session session-name bfd-session-name
The APS group is bound to a BFD session.
In an example, BFD is configured to track a working interface. This configuration is similar to
the configuration for BFD to track a protection interface. The configuration procedure is as
follows:
Issue 02 (2014-09-30)
– In 1:1 mode, after a fault is rectified and the WTR time (5 minutes) expires, traffic
automatically switches back to the working link.
– In 1+1 mode, after a fault is rectified, traffic does not automatically switch back
to the working interface. The aps revert wtr-time command can be used to set a
WTR time before an APS group switchback is performed. After the fault is
rectified, data services will switch back to the working interface after the
configured WTR time expires.
NOTE
If two different switchback delays are set on two protection interfaces in APS groups on two
ends of a link, the effective switchback delay depends on one of the following situations:
l If one-plus-one unidirection is configured, the switchback delays of both protection
interfaces take effect after the working interfaces recover.
l If one2one bidirection or one-plus-one bidirection is configured, the switchback delay
of the protection interface on the device with the working interface recovering later than
the other working interface takes effect on both protection interfaces.
l In an E-APS scenario, the switchback time must be the same on two APS devices at the
RNC side and slave RSG side.
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3 APS Configuration
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