分类:
2012-02-07 20:43:13
在大型的网络中,整个迁移过程可能要耗时几天。在这个迁移过程中,你的网络运行在混合生成树模式中。这样,你就不能使整个网络都接受Rapid-PVST+广告。想要了解在混合模式下的生成树行为,可以使用debug spanning-tree特权模式命令来查看。下面是几个执行该调试命令的输出示例,从中可以看出当前交换机正运行的生成树模式。
当Access 1与Distribution 1之间的链路失效时,在Access 1上执行debug spanning-tree命令的输出示例,如下:
00:55:13: RSTP(10): updt roles, root port Fa0/1 going down
00:55:13: RSTP(10): Fa0/2 is now root port
00:55:13: RSTP(10): Fa0/2 received a tc ack
00:55:15: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to adminis
tratively down
00:55:16: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, cha
nged state to down
当Access 1与Distribution 1之间的链路失效时,在Distribution 1上执行debug spanning-tree命令的输出示例,如下:
00:55:20: STP: VLAN0010 Topology Change rcvd on Fa1/0/23
00:55:20: STP: VLAN0020 sent Topology Change Notice on Fa1/0/24
00:55:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0/1,
changed state to down
00:55:22: %LINK-3-UPDOWN: Interface FastEthernet1/0/1, changed state to down