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BGP Dampening does not work when a BGP peer physical link flaps continuously

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TitleBGP Dampening does not work when a BGP peer physical link flaps continuously
Symptoms
  • BGP Dampening does not work when a BGP peer physical link flaps continuously
    slx9540# show ip bgp damp 
    slx9540# show ip bgp flap 
    Total number of flapping routes: 0  <<<<<<<<<<<<<<<<<<<< No flaps recorded after session flaps
  • Works fine when BGP prefix is withdrawn and re-announced
    telnet(config-bgp-ipv4u)#no network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#no network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#no network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#no network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#no network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#no network 10.30.40.0/24 
    telnet(config-bgp-ipv4u)#network 10.30.40.0/24
    slx9540# show ip bgp flap 
    Total number of flapping routes: 1 
    Status Code >:best d:damped h:history *:valid 
    Network From Flaps Since Reuse Path 
    *d 10.30.40.0/24 10.123.123.53 6 0 :0 :12 0 :10:0 8000 
    
    slx9540# show ip bgp damp 
    Status Code >:best d:damped h:history *:valid 
    Network From Flaps Since Reuse Path 
    *d 10.30.40.0/24 10.123.123.53 6 0 :0 :11 0 :10:0 8000​​
Environment
  • SLX-OS
  • Netiron OS
  • SLX Series
  • MLX/MLXe Series
  • CER/CES Series
  • BGP
  • Dampening
Cause
Dampening only works if the Next Layer Reachibility Information (NLRI) advertised by the BGP peer is unstable.
Resolution
The BGP dampening feature is currently working as designed.
Additional notes

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