Configuring The Bfd Wtr - Huawei NetEngine80E Configuration Manual - Reliability

HUAWEI NetEngine80E/40E Router
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 interval at which BFD packets are sent is 10 milliseconds.
Step 4 Run:
min-rx-interval interval
The receiving interval is set.
By default, the minimum interval at which BFD packets are sent is 10 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.

5.11.3 Configuring the BFD WTR

The wait to restore (WTR) time for a BFD session is used to prevent frequent master/slave
switchovers triggered by BFD session flapping.
Issue 02 (2014-09-30)
NOTE
l Effective local sending interval = MAX { Configured local interval at which BFD packets are sent,
Remotely configured interval at which BFD packets are received }; Effective local interval at which
BFD packets are received = MAX { Configured remote interval at which BFD packets are sent,
Configured local interval at which BFD packets are received }; Effective local detection interval =
Effective local interval at which BFD packets are received x Configured remote detection multiplier
l To modify a parameter after a BFD session has been created, run a corresponding command (such as
process-pst, process-interface-status,min-tx-interval, min-rx-interval, detect-multiplier, tos-exp
(BFD session view), 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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