[Bug 221122] Attaching interface to a bridge stops all traffic on uplink NIC for few seconds

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221122

--- Comment #13 from Heinz N. Gies <heinz at project-fifo.net> ---
(In reply to Eugene Grosbein from comment #12)


ifconfig em0 (no bridge interfaces)
em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
       
options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>
        ether 00:25:90:a6:3b:c7
        hwaddr 00:25:90:a6:3b:c7
        inet 192.168.1.22 netmask 0xffffff00 broadcast 192.168.1.255
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active

adding first bridge interface:

64 bytes from 192.168.1.22: icmp_seq=22 ttl=64 time=1.325 ms
Request timeout for icmp_seq 23
Request timeout for icmp_seq 24
Request timeout for icmp_seq 25
Request timeout for icmp_seq 26
Request timeout for icmp_seq 27
Request timeout for icmp_seq 28
Request timeout for icmp_seq 29
64 bytes from 192.168.1.22: icmp_seq=30 ttl=64 time=1.261 ms

ifconfig em0 (after adding bridge interface) 
em0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu
1500
        options=42098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWTSO>
        ether 00:25:90:a6:3b:c7
        hwaddr 00:25:90:a6:3b:c7
        inet 192.168.1.22 netmask 0xffffff00 broadcast 192.168.1.255
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active


adding second interface:

64 bytes from 192.168.1.22: icmp_seq=132 ttl=64 time=1.432 ms
64 bytes from 192.168.1.22: icmp_seq=133 ttl=64 time=1.332 ms
64 bytes from 192.168.1.22: icmp_seq=134 ttl=64 time=1.146 ms

(no drops)

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