Someone

purserj@holly:~/kvm_test$ brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.001302b7972d       yes             eth1
                                                        tap10

br0
 bridge id              8000.001302b7972d
 designated root        8000.001302b7972d
 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             300.01
 hello timer               0.99                 tcn timer                  0.00
 topology change timer     0.00                 gc timer                   8.99
 flags


eth1 (0)
 port id                0000                    state                forwarding
 designated root        8000.001302b7972d       path cost                100
 designated bridge      8000.001302b7972d       message age timer          0.00
 designated port        8001                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags

tap10 (0)
 port id                0000                    state                forwarding
 designated root        8000.001302b7972d       path cost                100
 designated bridge      8000.001302b7972d       message age timer          0.00
 designated port        8002                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags