Configuring Bfd For Bgp; Displaying And Maintaining Bgp; Displaying Bgp - HPE 5800 Series Configuration Manual

Step
Enter system view.
1.
Enter BGP view.
2.
Enable the logging of
3.
session state changes
globally.
Enter BGP-VPN instance
4.
view.
Enable the logging of
5.
session state changes for a
peer or peer group.

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 mechanism makes link failure detection rather slow. Once a failure occurs on a
high-speed link, a large quantity of packets are dropped. BFD resolves this issue by detecting links
between neighbors quickly to reduce convergence time upon link failures.
For more information about BFD, see High Availability Configuration Guide.
IMPORTANT:
• Before you configure BFD for BGP, you must 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.
To enable BFD for a BGP peer:
Step
Enter system view.
1.
Enter BGP view or
2.
BGP-VPN instance view.
Enable BFD for the specified
3.
BGP peer.

Displaying and maintaining BGP

Displaying BGP

Command
system-view
bgp as-number
log-peer-change
ipv4-family vpn-instance
vpn-instance-name
peer { group-name | ip-address }
log-change
Command
system-view
•
Enter BGP view:
bgp as-number
•
Enter BGP-VPN instance view:
a. bgp as-number
b. ipv4-family vpn-instance
vpn-instance-name
peer ip-address bfd
215
Remarks
N/A
N/A
Optional.
Enabled by default.
Optional.
Optional.
Enabled by default.
Remarks
N/A
Use either approach.
Not enabled for any BGP peer
by default.