We(ISP) have encountered a problem with MikroTik Router version 6. When we advertise an IP block in BGP networks, it functions correctly. However, upon removing the IP block, it gets removed from routing BGP advertisements, but the block continues to be advertised. Even after refreshing the BGP peers (eBGP), the issue persists. Interestingly, when I advertise the block on a different router (different AS), it works as expected. But upon removal, it reverts to the previous situation and continues advertising from the previous point. I have thoroughly checked the configuration for this IP block and found no anomalies. This issue has occurred with multiple IP blocks.
Has anyone encountered a similar problem or have any insights on resolving this issue? Your assistance would be greatly appreciated. Thank you!