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Configuring BFD for IPv6 BGP
IPv6 BGP maintains neighbor relationships based on the keepalive timer and holdtime timer, which are
set in seconds. IPv6 BGP defines that the holdtime interval must be at least three times the keepalive
interval. This mechanism makes the detection of a link failure rather slow and thus causes a large
quantity of packets to be dropped especially when the failed link is a high-speed link. You can enable
BFD to detect the link to a peer. BFD can quickly detect any link failure and thus reduce network
convergence time.
After a link failure occurs, BFD may detect the failure before the system performs GR and as a result, GR
will fail. Therefore, if GR capability is enabled for IPv6 BGP, use BFD with caution. For more information
about BFD, see
High Availability Configuration Guide
.
IMPORTANT:
Before configuring BFD for IPv6 BGP, you must enable BGP.
To enable BFD for a BGP peer:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable BGP and enter BGP
view.
bgp
as-number
Not enabled by default.
3.
Enter IPv6 address family
view.
ipv6-family
N/A
4.
Enable BFD for the specified
BGP peer.
peer
ipv6-address
bfd
Not enabled for any BGP peer by
default.
Displaying and maintaining IPv6 BGP
Displaying BGP
Task Command
Remarks
Display IPv6 BGP peer group
information.
display bgp ipv6
group
[
ipv6-group-name
] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in
any view
Display IPv6 BGP advertised
routing information.
display bgp ipv6 network
[
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in
any view
Display IPv6 BGP AS path
information.
display bgp ipv6
paths
[
as-regular-expression
|
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in
any view
Display IPv6 BGP peer or peer
group information.
display bgp ipv6 peer
[
group-name
log-info
|
ipv4-address
verbose
|
ipv6-address
{
log-info
|
verbose
} |
verbose
] [
|
{
begin
|
exclude
|
include
}
regular-expression
]
Available in
any view
