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On earlier firmware versions, the command 'diagnose ip router bgp <module> <enable | disable>' has a known issue.
When enabling or disabling debugging for a specific module, such as 'dampening', all BGP debug categories are enabled or disabled instead, which is not correct.
First # diagnose ip router bgp dampening enable
Debug messages will be on for 30 minutes.
First # diagnose ip router bgp show
BGP debugging status:
BGP debugging is on
BGP nsm debugging is on
BGP events debugging is on
BGP keepalives debugging is on
BGP updates debugging is on
BGP fsm debugging is on
BGP filter debugging is on
BGP Route Flap Dampening debugging is on
BGP debug level: ERROR
timestamp disabled
First # diagnose ip router bgp nsm disable
First # diagnose ip router bgp show
BGP debugging status:
BGP debug level: ERROR
timestamp disabled
The 'diagnose ip router bgp updates <enable | disable>' command is not affected by this issue. This command correctly enables or disables only BGP updates debugging.
The internal issue ID number is 1165424, and the issue is scheduled for fix in FortiOS v7.6.4.
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