Routing

Hi all,

One question, if i turn on GRES + NSR but BGP still flap during RE switchover, is it normal or not?

Hello,

What product? What JUNOS version?

If session is negotiated with AFI/SAFI which is not supported by NSR then such session would reset.

http://www.juniper.net/documentation/en_US/junos15.1/topics/reference/requirements/nsr-system-requirements.html#nsr-bgp 

HTH

Thanks

Alex

Hi,

Product = MX480

Junos = Junos: 14.2R4.9

I'm also detect the fabric plane restart

> show chassis fabric summary
Plane   State    Uptime
 0      Online   1 hour, 26 minutes, 30 seconds
 1      Online   1 hour, 26 minutes, 30 seconds
 2      Online   1 hour, 26 minutes, 30 seconds
 3      Online   1 hour, 26 minutes, 30 seconds
 4      Spare    1 hour, 26 minutes, 30 seconds
 5      Spare    1 hour, 26 minutes, 29 seconds
 6      Spare    1 hour, 26 minutes, 29 seconds
 7      Spare    1 hour, 26 minutes, 29 seconds

> show chassis fpc detail
Slot 0 information:
  State                                 Online    
  Temperature                        36
  Total CPU DRAM                   3584 MB
  Total RLDRAM                      275 MB
  Total DDR DRAM                   20352 MB
  Start time:                           2015-10-29 17:27:49 MYT
  Uptime:                               13 days, 8 hours, 13 minutes, 11 seconds
  Max Power Consumption             530 Watts

Thabks

check for log messages and chassisd for something that points to fabric reload and bgp flap. 

If we on NSR and GRES with all address-family support bgp session not flap but when re0 failover to re1

re0 will restart timer once you failback active re to re0 session timer less than re1 but you can check opposite BGP peer  bgp establish time was stable