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JunosE 11.3.x IP, IPv6, and IGP Configuration Guide
ip ospf bfd-liveness-detection
ipv6 ospf bfd-liveness-detection
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peer—if BFD is enabled and if the session is not already present—the local peer attempts
to create a BFD session to the remote peer.
Each adjacent pair of peers negotiates an acceptable transmit interval for BFD packets.
The negotiated value can be different on each peer. Each peer then calculates a BFD
liveness detection interval. When a peer does not receive a BFD packet within the detection
interval, it declares the BFD session to be down and purges all routes learned from the
remote peer.
NOTE: Before the router can use the ip ospf bfd-liveness-detection or ipv6
ospf bfd-liveness-detection command, you must specify a BFD license key.
To view an already configured license, use the show license bfd command.
For general information about configuring and monitoring the BFD protocol, see JunosE
IP Services Configuration Guide.
Use to enable BFD (bidirectional forwarding detection) and define BFD values to more
quickly detect OSPFv2 or OSPFv3 data path failures.
The peers in an OSPF adjacency use the configured values to negotiate the actual
transmit intervals for BFD packets.
You can use the minimum-transmit-interval keyword to specify the interval at which
the local peer proposes to transmit BFD control packets to the remote peer. The
default value is 300 milliseconds.
You can use the minimum-receive-interval keyword to specify the minimum interval
at which the local peer must receive BFD control packets from the remote peer. The
default value is 300 milliseconds.
You can use the minimum-interval keyword to specify the same value for both of
those intervals. Configuring a minimum interval has the same effect as configuring
the minimum receive interval and the minimum transmit interval to the same value.
The default value is 300 milliseconds.
You can use the multiplier keyword to specify the detection multiplier value. The
calculated BFD liveness detection interval can be different on each peer. The multiplier
value is roughly equivalent to the number of packets that can be missed before the
BFD session is declared to be down. The default value is 3.
For details on liveness detection negotiation, see JunosE IP Services Configuration Guide
.
You can change the BFD liveness detection parameters at any time without stopping
or restarting the existing session; BFD automatically adjusts to the new parameter
value. However, no changes to BFD parameters take place until the values resynchronize
with each peer.
Example 1 (OSPFv2)
Copyright © 2010, Juniper Networks, Inc.
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