查看网桥设备以及端口 使用brctl show可以查看本地上的所有的网桥设备以及接到网桥设备上的所有网络设备。
查看网桥设备的mac地址表 执行brctl showmacs ${dev}，常用来排查一些包丢在网桥上的场景。
1 2 3 4 5 6 7 8 9 10 $ brctl showmacs br0 port no mac addr is local? ageing timer 1 02:50:89:59:ac:4b no 3.96 69 02:e2:14:78:d7:92 no 0.57 1 0a:1e:01:dc:67:87 no 10.23 1 0a:60:3c:ca:a8:85 no 6.04 1 0e:01:ce:d6:fc:66 no 8.36 1 0e:0c:f8:6c:08:75 no 56.73 58 0e:49:85:f6:a1:40 no 1.30 22 0e:c0:99:b0:d9:f9 no 0.85
查看网桥设备的某个端口的挂载设备 在上文中中可以获取到某个mac地址对应的网桥设备的端口号，要想知道某个网桥设备的端口号对应的设备可以使用brctl showstp ${dev}命令。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 brctl showstp br0 br0 bridge id 8000.ae90501b5b47 designated root 8000.ae90501b5b47 root port 0 path cost 0 max age 20.00 bridge max age 20.00 hello time 2.00 bridge hello time 2.00 forward delay 15.00 bridge forward delay 15.00 ageing time 300.00 hello timer 0.03 tcn timer 0.00 topology change timer 0.00 gc timer 62.37 flags bond0.11 (1) port id 8001 state forwarding designated root 8000.ae90501b5b47 path cost 100 designated bridge 8000.ae90501b5b47 message age timer 0.00 designated port 8001 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags veth02b41ce8 (20) port id 8014 state forwarding designated root 8000.ae90501b5b47 path cost 2 designated bridge 8000.ae90501b5b47 message age timer 0.00 designated port 8014 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags hairpin mode 1