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SW1:conf tint port-channel 1进入接口模式int port-channel 1sw tr en dotsw mode trunint g1/0/12sw trunk en dotsw mode trunkchannel-group 1 mode onint g1/0/24sw trunk en dotsw mode trunkchannel-group 1 mode on=======================================================================================SW2:conf tint port-channel 1进入接口模式int port-channel 1sw tr en dotsw mode trunint g1/0/23sw trunk en dotsw mode trunkchannel-group 1 mode onint g1/0/24sw trunk en dotsw mode trunkchannel-group 1 mode on到此，两边应该就都通了，show ip int brief ，应该会看到一个虚的port-channel 1 的接口，是up的。============================================================================================但是昨天晚上在实施的时候，没有事先把端口归进 group组，出现了环路，在其中一台核心3750G上面出现了如下的报错：1 is flapping between port Po1 and port Gi1/0/3*May 11 09:55:48.371 GMT: %SW_MATM-4-MACFLAP_NOTIF: Host 001e.c9b2.3541 in vlan1 is flapping between port Gi1/0/3 and port Po1*May 11 09:55:48.397 GMT: %PM-4-ERR_DISABLE: channel-misconfig error detected onGi1/0/12, putting Gi1/0/12 in err-disable state*May 11 09:55:48.413 GMT: %PM-4-ERR_DISABLE: channel-misconfig error detected onGi1/0/24, putting Gi1/0/24 in err-disable state*May 11 09:55:49.412 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/12, changed state to down*May 11 09:55:49.428 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/24, changed state to down*May 11 09:55:49.428 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to down*May 11 09:55:49.445 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2,changed state to down*May 11 09:55:49.445 GMT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to down*May 11 09:55:50.418 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/12, changed state to down*May 11 09:55:50.443 GMT: %LINK-3-UPDOWN: Interface Port-channel1, changed stateto down*May 11 09:55:50.443 GMT: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/24, changed state to down可以看出，两个口子，已经全部被STP给down掉了，进接口一看，全是error-disable状态，于是，在理清了思路以后，把端口归进channel-group 1 的组，把接口shut,接着no shut，到此，故障解决，两台交换机一切正常，实现了线路冗余与带宽扩容。
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