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CHAPTER 4
Configuring BFD
Bidirectional Forwarding Detection Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes how to configure bidirectional forwarding detection (BFD) on
your E Series router; it contains the following sections:
Bidirectional Forwarding Detection Overview on page 107
BFD Platform Considerations on page 110
BFD References on page 110
Configuring a BFD License on page 110
BFD Version Support on page 111
Configuring BFD on page 112
Managing BFD Adaptive Timer Intervals on page 112
Clearing BFD Sessions on page 113
Monitoring BFD on page 114
Fast failure detection is a high priority feature for any network element. Some media, like
Ethernet, do not provide remote end failure. Networks must often rely on internal gateway
protocol (IGP) hello messages to detect any failure and, in some cases (for example,
static routes), even these hello messages are not used.
IGP hellos have their own limitations—it often takes one second or more to detect a
remote end failure and processing IGP hello messages takes precious processing time.
BFD overcomes IGP detection time and processing limitations in detecting any data path
failures.
When configured for protocols like OSPF and IS-IS, BFD employs rapid, periodic, and
inexpensive hello messages to detect path activity. You can also configure BFD to function
with static routes, combining with the BFD poll bit to detect path activity.
When configured for various protocols like OSPF and IS-IS, BFD employs rapid, periodic
and inexpensive hello messages to detect path activity. You can also configure BFD to
function with static routes, combining with the BFD poll bit to detect path activity.
You can also configure a BFD session with a BGP neighbor or peer group to determine
relatively quickly whether the neighbor or peer group is reachable. For information about
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