Juniper ACX1000 Configuration Manual page 742

ACX Series Universal Access Router Configuration Guide
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shorter time limits than the Protocol Independent Multicast (PIM) hello hold time, so
they provide faster detection.
The BFD failure detection timers are adaptive and can be adjusted to be faster or slower.
The lower the BFD failure detection timer value, the faster the failure detection and vice
versa. For example, the timers can adapt to a higher value if the adjacency fails (that is,
the timer detects failures more slowly). Or a neighbor can negotiate a higher value for a
timer than the configured value. The timers adapt to a higher value when a BFD session
flap occurs more than three times in a span of 15 seconds. A back-off algorithm increases
the receive (Rx) interval by two if the local BFD instance is the reason for the session
flap. The transmission (Tx) interval is increased by two if the remote BFD instance is the
reason for the session flap. You can use the
interval timers to their configured values. The
meaning that the command does not affect traffic flow on the routing device.
You must specify the minimum transmit and minimum receive intervals to enable BFD
on PIM.
To enable failure detection:
Configure the interface globally.
1.
This example shows the global configuration.
[edit protocols pim]
user@host# edit interface fe-1/0/0.0 family inet bfd-liveness-detection
Configure the minimum transmit interval.
2.
This is the minimum interval after which the routing device transmits hello packets
to a neighbor with which it has established a BFD session. Specifying an interval smaller
than 300 ms can cause undesired BFD flapping.
[edit protocols pim interface fe-1/0/0.0 bfd-liveness-detection]
user@host# set transmit-interval 350
Configure the minimum interval after which the routing device expects to receive a
3.
reply from a neighbor with which it has established a BFD session.
Specifying an interval smaller than 300 ms can cause undesired BFD flapping.
[edit protocols pim interface fe-1/0/0.0 family inet bfd-liveness-detection]
user@host# set minimum-receive-interval 350
(Optional) Configure other BFD settings.
4.
As an alternative to setting the receive and transmit intervals separately, configure
one interval for both.
[edit protocols pim interface fe-1/0/0.0 family inet bfd-liveness-detection]
user@host# set minimum-interval 350
command to return BFD
clear bfd adaptation
command is hitless,
clear bfd adaptation
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