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Configuring BFD for BGP
BGP maintains neighbor relationships based on the keepalive timer and holdtime timer, which are set in
seconds. BGP defines that the holdtime interval must be at least three times the keepalive interval. This
slows down link failure detection; once a failure occurs on a high-speed link, a large quantity of packets
will be dropped. BFD is introduced to solve this problem. It detects links between neighbors quickly to
reduce convergence time upon link failures.
Follow these steps to enable BFD for a BGP peer:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter BGP view
bgp
as-number
—
Enable BFD for the specified BGP
peer
peer
ip-address
bfd
Required
Not enabled for any BGP peer by
default
NOTE:
•
Before configuring BFD for BGP, you need to enable BGP.
•
After a link failure occurs, BFD may detect the failure before the system performs GR. As a result, GR will
fail. If GR capability is enabled for BGP, use BFD with caution. If GR and BFD are both enabled, do not
disable BFD during a GR process; otherwise, GR may fail.
•
For BFD configuration, see High Availability Configuration Guide.
Displaying and maintaining BGP
Displaying BGP
To do…
Use the command…
Remarks
Display peer group information
display bgp group
[
group-name
] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Display advertised BGP routing
information
display bgp
network
[
|
{
begin
|
exclude
|
include
}
regular-expression
]
Display AS path information
display bgp paths
[
as-regular-expression
|
|
{
begin
|
exclude
|
include
}
regular-expression
]
Display BGP peer or peer group
information
display bgp peer
[
ip-address
{
log-info
|
verbose
} |
group-name
log-info
|
verbose
] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Display the prefix information in
the ORF packet from the specified
BGP peer
display bgp
peer
ip-address
received ip-prefix
[
|
{
begin
|
exclude
|
include
}
regular-expression
]
Display BGP routing information
display bgp routing-table
[
ip-address
[
{
mask
|
mask-length
}
[
longer-prefixes
] ] ] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in
any view
