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Step Command Remarks
2. Enter BGP IPv4 unicast
address family view or
BGP-VPN IPv4 unicast
address family view.
• Enter BGP IPv4 unicast address
family view:
a. bgp as-number
b. address-family ipv4
[ unicast ]
• Enter BGP-VPN IPv4 unicast
address family view:
c. bgp as-number
d. ip vpn-instance
vpn-instance-name
e. address-family ipv4
[ unicast ]
N/A
3. Enable logging for BGP route
flapping.
log-route-flap
monitor-time
monitor-count [ log-count-limit |
route-policy
route-policy-name ] *
By default, logging for BGP
route flapping is disabled.
To enable logging for BGP route flapping (IPv6 unicast):
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter BGP IPv6 unicast
address family view or
BGP-VPN IPv6 unicast
address family view.
• Enter BGP IPv6 unicast address
family view:
a. bgp as-number
b. address-family ipv6
[ unicast ]
• Enter BGP-VPN IPv6 unicast
address family view:
c. bgp as-number
d. ip vpn-instance
vpn-instance-name
e. address-family ipv6
[ unicast ]
N/A
3. Enable logging for BGP route
flapping.
log-route-flap
monitor-time
monitor-count [ log-count-limit |
route-policy
route-policy-name ] *
By default, logging for BGP
route flapping is disabled.
Configuring BFD for BGP
IMPORTANT:
If you have enabled GR, use BFD with caution because BFD might detect a failure before the
system performs GR, which will result in GR failure. If you have enabled both BFD and GR for BGP,
do not disable BFD during a GR process to avoid GR failure.
BGP maintains neighbor relationships based on the keepalive timer and hold timer in seconds. It
requires that the hold time must be at least three times the keepalive interval. This mechanism slows
down link failure detection. Once a failure occurs on a high-speed link, a large quantity of packets will
be dropped before routing convergence completes. BFD for BGP can solve this problem by fast
detecting link failures to reduce convergence time.
For more information about BFD, see High Availability Configuration Guide.
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