This KB article provides insights into the BGP log message [Jun 9 10:42:21 SRX-JTAC rpd[20878]: bgp_ifachange_group:10903: NOTIFICATION sent to <IP> (External AS 1234): code 6 (Cease) subcode 9 (Hard Reset) [code 6 (Cease) subcode 6 (Other Configuration Change)], Reason: Interface change for the peer-group]. Whether you're encountering this log message for the first time or seeking clarification on its meaning and implications, this article offers valuable explanations and context.

The related BGP interface is reported as down.

This log message is considered normal and expected behavior in BGP (Border Gateway Protocol). When a related BGP interface goes down, BGP notifies users by generating this message, indicating a change in the interface status. The notification is triggered whenever there is a change in the specific interface's status. In this scenario, if the interface transitions either up or down, this notification will be triggered, and BGP will relay it as a NOTIFICATION message.

It's important to note that this notification does not signify any configuration changes to the BGP parameters. Instead, it simply alerts users to the change in interface status, facilitating network monitoring and troubleshooting.