[j-nsp] bgp flap

[Janto Cin]

Dear All,

Need help to know what are the causes for bgp flap with hold timer expired error.
The link itself didn't flapped.
How to prevent this?

Feb 17 01:27:32  GW rpd[2342]: bgp_traffic_timeout: NOTIFICATION sent to 10.1.1.1 (External AS 9999): code 4 (Hold Timer Expired Error), Reason: holdtime expired for 10.1.1.1 (External AS 9999)
Feb 17 02:41:54  GW rpd[2342]: bgp_read_v4_update: NOTIFICATION received from 10.1.1.1 (External AS 9999): code 4 (Hold Timer Expired Error)
Feb 17 03:02:00  GW rpd[2342]: bgp_traffic_timeout: NOTIFICATION sent to 10.1.1.1 (External AS 9999): code 4 (Hold Timer Expired Error), Reason: holdtime expired for 10.1.1.1 (External AS 9999)
Feb 17 03:04:07  GW rpd[2342]: bgp_traffic_timeout: NOTIFICATION sent to 10.1.1.1 (External AS 9999): code 4 (Hold Timer Expired Error), Reason: holdtime expired for 10.1.1.1 (External AS 4761)
Feb 17 03:49:27  GW rpd[2342]: bgp_read_v4_update: NOTIFICATION received from 10.1.1.1 (External AS 9999): code 4 (Hold Timer Expired Error)

Many Thanks and Regards,
Janto