Configuring The Bfd Wtr - Huawei AR2200-S Series Configuration Manual

Huawei AR2200-S Series Enterprise Routers
Configuration Guide - Reliability
The BFD session view is displayed.
Step 3 Run:
min-tx-interval interval
The sending interval is set.
By default, the minimum sending interval is 1000 milliseconds.
Step 4 Run:
min-rx-interval interval
The receiving interval is set.
By default, the minimum sending interval is 1000 milliseconds.
Step 5 Run:
detect-multiplier multiplier
The local detection multiplier is set.
By default, the local detection multiplier is 3.
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Follow-up Procedure
To efficiently use system resources, when detecting that a BFD session goes Down, the system
automatically adjusts the intervals at which BFD control packets are sent and received to a
random value larger than 1000 milliseconds. After the BFD session goes Up, the configured
intervals recover.

3.7.3 Configuring the BFD WTR

The Wait to Recovery (WTR) time for a BFD session is used to prevent frequent master/slave
switchovers triggered by BFD session flapping.
Context
The WTR time for a BFD session is used to prevent frequent master/slave switchovers caused
by BFD session flapping. If a BFD session changes from Down to Up, BFD reports the change
to an upper-layer application after the WTR time expires.
Do as follows on the router:
Issue 01 (2012-01-06)
NOTE
To modify a parameter after a BFD session has been created, run a corresponding command (such as
process-interface-status,min-tx-interval, min-rx-interval, detect-multiplier, tos-exp, wtr, or
description). The modification takes effect immediately without the commit command configured.
NOTE
To meet the requirement for fast detection, BFD draft defines that the sending interval and the receiving
interval are at microsecond level. On most devices, BFD detection is performed only at millisecond level,
and the processing inside the devices is at microsecond level.
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3 BFD Configuration
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