[Bug 224116] STP Frames are ignored

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224116

            Bug ID: 224116
           Summary: STP Frames are ignored
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: michael at neese-web.de

Created attachment 188556
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=188556&action=edit
ifconfig

Hello,

on our two systems, bpdu frames (spanning-tree) are ignored. We can't even see
them with a tcpdump.
We're running two pfsense firewalls in version 2.4.2 (freebsd 11.1-Release-p4)
as HA and in bridge mode. Because the pfsense systems ignore the bpdu frames,
both think they are the root bridge.
If we boot a linux live system, everything is ok. We can also see them in
tcpdump.
tcpdump command used: tcpdump -i ixl1 -vvv -n stp

We also investigatet the problem with a pfsense gold partner and they ment, we
should report it upstream.

Used NICs:
ixl0 at pci0:5:0:0:        class=0x020000 card=0x00068086 chip=0x15728086 rev=0x01
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Controller X710 for 10GbE SFP+'
    class      = network

Switch: WS-C3850-24XS
Switch Firmware: 16.3.3

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