R0106-HP MSR Router Series Layer 3 - IP Routing Configuration Guide(V7)

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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.

Before you can enable BFD for the BGP peer, establish a BGP session between the local router and the

peer.

To enable BFD for a BGP peer (IPv4 unicast/multicast address family):

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Enter BGP view or BGP-VPN instance

view.

• Enter BGP view:

bgp as-number

• Enter BGP-VPN instance view:

a. bgp as-number

b. ip vpn-instance

vpn-instance-name

N/A

3. Enable BFD to detect the link to the

specified BGP peer.

peer ip-address bfd [ multi-hop |

single-hop ]

By default, BFD is not

enabled.

To enable BFD for a BGP peer (IPv6 unicast/multicast address family):

Ste