Linux 커널 가상 브리지 포트 번호 이해

나는 인터페이스가 포함 된 리눅스 커널 가상 다리가 eth1와를 tap0:

# brctl show br0
bridge name     bridge id               STP enabled     interfaces
br0             8000.00016c404fa3       no              eth1
                                                        tap0
# 

이제 가상 스위치의 MAC 주소 테이블을 보면 포트 번호 2( tap0인터페이스) 및 3( eth1인터페이스)가 표시됩니다.

# brctl showmacs br0
port no mac addr                is local?       ageing timer
  3     00:00:5e:00:01:c9       no                 0.11
  3     00:01:6c:40:2d:94       no                 0.53
  3     00:01:6c:40:4f:a3       yes                0.00
  3     00:01:6c:55:3a:72       no                55.33
  3     00:02:b3:8d:48:a7       no                 0.53
  3     00:0a:e4:2f:53:bb       no                 0.59
  3     00:0b:82:0a:bc:cc       no                16.98
  3     00:0c:29:07:3e:de       no                 9.12
  3     00:0c:29:94:95:39       no               156.77
  3     00:11:25:8c:7a:1a       no                16.50
  3     00:11:5c:13:af:51       no                 0.42
  3     00:15:60:5f:73:ee       no                84.73
  3     00:16:3e:4b:8e:2f       no               175.61
  3     00:19:e2:94:0b:f0       no                 7.48
  3     00:19:e2:9e:df:f0       no                 0.00
  3     00:1c:c0:61:20:a9       no                68.12
  3     00:23:7d:83:c8:9f       no                26.35
  3     00:25:9c:6e:74:e1       no               157.58
  3     00:90:fb:47:d0:8c       no                 0.46
  3     08:00:23:97:d0:87       no                14.62
  3     24:be:05:1f:71:82       no                 0.56
  3     24:be:05:1f:71:85       no                 0.51
  3     24:be:05:25:95:8f       no                 0.55
  3     4c:11:bf:98:ea:4f       no                 6.18
  3     4c:11:bf:9c:60:52       no                32.01
  3     78:24:af:37:10:70       no                51.89
  3     78:24:af:37:11:06       no                50.89
  3     88:51:fb:ec:45:1e       no                 7.12
  2     f6:b8:99:06:0b:65       yes                0.00
# 

가상 브리지 포트 번호는 1무엇입니까?

다음은 브리징 Linux 시스템 중 하나의 결과입니다.을 사용 brctl showstp하면 브리징과 관련된 인터페이스 및 스패닝 트리 매개 변수 목록을 인쇄 할 수 있습니다. 괄호 안에 구성 인터페이스의 인터페이스 인덱스가 brctl showmacs있습니다.

# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             3000.0a32fb000000       yes             tap0
                                                        tap1
                                                        tap14
                                                        tap3
                                                        tap4
                                                        tap5
                                                        tap8
                                                        tap9
# brctl showstp br0
br0
 bridge id              3000.0a32fb000000
 designated root        3000.0a32fb000000
 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               0.06                 tcn timer                  0.00
 topology change timer     0.00                 gc timer                 139.36
 flags  


tap0 (1)
 port id                8001                    state                forwarding
 designated root        3000.0a32fb000000       path cost                100
 designated bridge      3000.0a32fb000000       message age timer          0.00
 designated port        8001                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags  

tap1 (2)
 port id                8002                    state                forwarding
 designated root        3000.0a32fb000000       path cost                100
 designated bridge      3000.0a32fb000000       message age timer          0.00
 designated port        8002                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags  

tap14 (12)
 port id                800c                    state                forwarding
 designated root        3000.0a32fb000000       path cost                100
 designated bridge      3000.0a32fb000000       message age timer          0.00
 designated port        800c                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags  

tap3 (3)
 port id                8003                    state                forwarding
 designated root        3000.0a32fb000000       path cost                100
 designated bridge      3000.0a32fb000000       message age timer          0.00
 designated port        8003                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags  

tap4 (4)
 port id                8004                    state                forwarding
 designated root        3000.0a32fb000000       path cost                100
 designated bridge      3000.0a32fb000000       message age timer          0.00
 designated port        8004                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags  

tap5 (5)
 port id                8005                    state                forwarding
 designated root        3000.0a32fb000000       path cost                100
 designated bridge      3000.0a32fb000000       message age timer          0.00
 designated port        8005                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags  

tap8 (6)
 port id                8006                    state                forwarding
 designated root        3000.0a32fb000000       path cost                100
 designated bridge      3000.0a32fb000000       message age timer          0.00
 designated port        8006                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags  

tap9 (8)
 port id                8008                    state                forwarding
 designated root        3000.0a32fb000000       path cost                100
 designated bridge      3000.0a32fb000000       message age timer          0.00
 designated port        8008                    forward delay timer        0.00
 designated cost           0                    hold timer                 0.00
 flags  

# brctl showmacs br0
port no mac addr                is local?       ageing timer
  8     00:00:00:16:d7:28       yes                0.00
 12     00:00:00:23:4c:3b       yes                0.00
  1     00:00:00:24:fb:74       yes                0.00
  8     00:00:00:54:20:b5       no                44.91
  2     00:00:00:5b:14:3d       yes                0.00
  6     00:00:00:6b:dc:8c       no                45.22
  4     00:00:00:81:6d:8d       no                45.03
  1     00:00:00:81:6d:92       no                45.00
  2     00:00:00:a2:4f:16       no                 7.24
  8     00:00:00:a2:4f:7e       no                53.66
  2     00:00:00:a2:4f:9e       no                25.54
  2     00:00:00:b1:8a:35       no                44.86
  3     00:00:00:b8:14:87       yes                0.00
  5     00:00:00:c2:7b:d2       no                16.28
 12     00:00:00:d4:6c:ea       no                45.02
  4     00:00:00:ee:25:9f       yes                0.00 
  5     00:00:00:ef:01:b2       no                 0.57

왜 인터페이스 색인 번호 매기기가 연속적이지 않은지 물을 수 있습니다. 글쎄, 원래 브리지를 시작하고 인터페이스를 추가하면 바로 연결됩니다. 그런 다음 인터페이스를 제거하면 브리지에 남아있는 인터페이스의 번호가 다시 정렬되지 않습니다. 그러나 브리지에 인터페이스를 다시 추가하기 시작하면 이러한 구멍이 채워집니다.