Technical Tip: Capture BGP debugs for a specific neighbor

[asoni]

Description	This article describes how to run BGP debugs for a specific neighbor when multiple BGP neighbors are configured.
Scope	FortiOS 7.2.x and above.
Solution	When multiple BGP neighbors are configured and it is required to focus only on a specific neighbor, the following filter command can be used along with other BGP debug commands: diag ip router bgp all enable diag ip router bgp level info diag ip router bgp set-filter neighbor a.b.c.d <replace a.b.c.d with neighbor address> diag debug enable In the following example, FortiGate is configured with two BGP neighbors - i.e 192.168.1.190 and 192.168.1.191. When running debug commands without filter, debug output for both neighbors will be shown: When running debug commands with filter, it is possible to only capture output / filter BGP debug for a specified neighbor - i.e 192.168.1.191: To show the current filter, run:    dia ip router bgp show To reset the BGP filter:    diag ip router bgp set-filter reset To disable BGP debugs:  diag ip router bgp all disable diag ip router bgp level none diag debug reset