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BGP Neighbor Relationship Flapped Due to the Command That Limits the Number of Routes on the Interconnected Device

Publication Date:  2019-01-24 Views:  142 Downloads:  0

Issue Description

The firewall set up a BGP neighbor relationship with a Cisco device, but the neighbor relationship flapped between the Established and Down states.

Handling Process

On the Cisco device, delete the neighbor 1000 90 command or change the maximum number of BGP routes to 10,000.

Root Cause

Check the BGP configurations on the firewall and Cisco device. The Cisco device has neighbor 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.


The peer route-limit command on the firewall is similar to that command on the Cisco device. During the configuration, pay attention to the number of BGP routes on the network.