How does the kernel control this kind of issue?

[PoleStarQ]

Hello, during testing, an issue appeared in MSTP. When pinging, because there is a spanning tree in user mode but not in kernel mode, protocol messages similar to ping packets may encounter problems. If the VLAN reaches a blocked port in the user-mode spanning tree, it can cause pings to loop or duplicate. How does the kernel control this kind of issue?

[seregega]

Hi. It not similar to icmp(ping) at all. BPDU packets has l2 mac destination field as special reserved address for slow protocols. Basic rule for all network devices is do not forward packets with this mac. Best Regards 11 дек. 2025 г., 17:32 +0300, PoleStarQ ***@***.***>, написал (-а):

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PoleStarQ created an issue (sonic-net/sonic-stp#81) Hello, during testing, an issue appeared in MSTP. When pinging, because there is a spanning tree in user mode but not in kernel mode, protocol messages similar to ping packets may encounter problems. If the VLAN reaches a blocked port in the user-mode spanning tree, it can cause pings to loop or duplicate. How does the kernel control this kind of issue? — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>