The firewall set up a BGP neighbor relationship with a Cisco device, but the neighbor relationship flapped between the Established and Down states.
On the Cisco device, delete the neighbor 188.8.131.52maximum-prefix 1000 90 command or change the maximum number of BGP routes to 10,000.
Check the BGP configurations on the firewall and Cisco device. The Cisco device has neighbor 184.108.40.206 maximum-prefix 1000 90 configured, which brings the neighbor relationship Down when the number of received routes reaches 1000 and generates an alarm when the number reaches 900 (90% of 1000).
The fault occurs when the number of BGP routes sent by the firewall reaches 1000 and the Cisco device proactively brings down the neighbor relationship.