HP 5920 Series Command Reference Manual page 360

Default
BFD is disabled.
Views
BGP view, BGP-VPN instance view
Predefined user roles
network-admin
Parameters
ip-address: Specifies a peer by its IP address. The peer must have been created.
ipv6-address: Specifies a peer by its IPv6 address. The peer must have been created.
multi-hop: Enables multi-hop BFD.
single-hop: Enables single-hop BFD.
Usage guidelines
When neither the multi-hop keyword nor the single-hop keyword is specified:
• If an IBGP peer is specified, this command enables multi-hop BFD for the IBGP peer.
If a directly connected EBGP peer is specified and the peer ebgp-max-hop command is not
•
configured, this command enables single-hop BFD for the EBGP peer. If the EBGP peer is not
directly connected or the peer ebgp-max-hop command is configured, this command enables
multi-hop BFD for the EBGP peer.
For more information about multi-hop and single-hop BFD, see High Availability Configuration Guide.
BFD helps speed up BGP routing convergence upon link failures. However, if you have enabled GR, use
BFD with caution because BFD might detect a failure before the system performs GR, resulting 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.
To establish a BFD session to a BGP peer, you must configure the same BFD detection mode multi-hop or
single-hop on the local router and the BGP peer.
Examples
# In BGP view, enable BFD for the link to BGP peer 1.1.1.1.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] peer 1.1.1.1 bfd
# In BGP view, enable BFD for the link to BGP peer 1::1.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] peer 1::1 bfd
# In BGP-VPN instance view, enable BFD for the link to BGP peer 2.2.2.2.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ip vpn-instance vpn1
[Sysname-bgp-vpn1] peer 2.2.2.2 bfd
# In BGP-VPN instance view, enable BFD for the link to BGP peer 2::2.
<Sysname> system-view
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