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    解決cisco的端口顯示err-disable1的方法:  導致這樣的情況可能是因為線路不通,物理指示燈滅或者顯示為橙色(不同平台指示燈狀態不同)  show interface 輸出顯示接口狀態:  FastEthernet0/47 is down, line protocol is down (err-disabled)  接口狀態是err-disable.  sw1#show interfaces status  Port Name Status Vlan Duplex Speed Type  Fa0/47 err-disabled 1 auto auto 10/100BaseTX  如果出現了接口狀態為err-disable,show interfaces status err-disabled命令能查看觸發err-disable的原因。  下面示例原因為bpduguard,在連接了交換機的端口配置了spanning-tree bpduguard enable.  sw1#show interfaces status err-disabled  Port Name Status Reason  Fa0/47 err-disabled bpduguard  接口產生err-disable的原因可以由以下的命令來查看,系統缺省的配置是所有列出的原因都能導致接口被置為err-disable.  sw1#show errdisable detect  ErrDisable Reason Detection status  ----------------- ----------------  udld Enabled  bpduguard Enabled  security-violatio Enabled  channel-misconfig Enabled  psecure-violation Enabled  dhcp-rate-limit Enabled  unicast-flood Enabled  vmps Enabled  pagp-flap Enabled  dtp-flap Enabled  link-flap Enabled  l2ptguard Enabled  gbic-invalid Enabled  loopback Enabled  dhcp-rate-limit Enabled  unicast-flood Enabled  從列表中,我們可以看出常見的原因有udld,bpduguard,link-flap以及loopback等。  具體由什麼原因導致當前接口err-disable可以由show interface status err-disable來查看。  在接口模式下采用shutdown,no shutdown進行手動的激活。  在缺省配置下,一旦接口被置為err-disable,IOS將不會試圖恢復接口。  這個可以由show errdisable recovery來查看,timer status下面所有的值都是disable.  下面的示例中,由於手工配置了bpduguard恢復,所以timer status的值變為Enable.  sw1#show errdisable recovery  ErrDisable Reason Timer Status  ----------------- --------------  udld Disabled  bpduguard Enabled  security-violatio Disabled  channel-misconfig Disabled  vmps Disabled  pagp-flap Disabled  dtp-flap Disabled  link-flap Disabled  l2ptguard Disabled  psecure-violation Disabled  gbic-invalid Disabled  dhcp-rate-limit Disabled  unicast-flood Disabled  loopback Disabled  Timer interval: 300 seconds  Interfaces that will be enabled at the next timeout:  Interface Errdisable reason Time left(sec)  --------- ----------------- --------------  Fa0/47 bpduguard 217  配置IOS重新激活errdisable的接口,使用以下命令:  sw1(config)#errdisable recovery cause bpduguard  sw1(config)#errdisable recovery cause ?  all Enable timer to recover from all causes  bpduguard Enable timer to recover from BPDU Guard error disable state  channel-misconfig Enable timer to recover from channel misconfig disable state  dhcp-rate-limit Enable timer to recover from dhcp-rate-limit error disable state  dtp-flap Enable timer to recover from dtp-flap error disable state  gbic-invalid Enable timer to recover from invalid GBIC error disable state  l2ptguard Enable timer to recover from l2protocol-tunnel error disable state  link-flap Enable timer to recover from link-flap error disable state  loopback Enable timer to recover from loopback detected disable state  pagp-flap Enable timer to recover from pagp-flap error disable state  psecure-violation Enable timer to recover from psecure violation disable state  security-violation Enable timer to recover from 802.1x violation disable state  udld Enable timer to recover from udld error disable state  unicast-flood Enable timer to recover from unicast flood disable state  vmps Enable timer to recover from vmps shutdown error disable  配置完上述命令後,IOS在一段時間後試圖恢復被置為err-disable的接口,這段時間缺省為300秒。  但是,如果引起err-disable的源沒有根治,在恢復工作後,接口會再次被置為err-disable.  調整err-disable的超時時間,可以使用以下命令:  sw1(config)#errdisable recovery interval ?  <30-86400> timer-interval(sec)  可以調整在30-86400秒,缺省是300秒。  如果產生err-disable的原因是udld,下面有一條命令非常管用:  sw1#udld reset  No ports are disabled by UDLD.  解決端口出現err-disabled問題  關於接口處於err-disable的故障排查  故障癥狀:  線路不通,物理指示燈滅或者顯示為橙色(不同平台指示燈狀態不同)  show interface 輸出顯示接口狀態:  FastEthernet0/47 is down, line protocol is down (err-disabled)  接口狀態是err-disable.  sw1#show interfaces status  Port Name Status Vlan Duplex Speed Type  Fa0/47 err-disabled 1 auto auto 10/100BaseTX  如果出現了接口狀態為err-disable,show interfaces status err-disabled命令能查看觸發err-disable的原因。  下面示例原因為bpduguard,在連接了交換機的端口配置了spanning-tree bpduguard enable.  sw1#show interfaces status err-disabled  Port Name Status Reason  Fa0/47 err-disabled bpduguard  接口產生err-disable的原因可以由以下的命令來查看,系統缺省的配置是所有列出的原因都能導致接口被置為err-disable.  sw1#show errdisable detect  ErrDisable Reason Detection status  ----------------- ----------------  udld Enabled  bpduguard Enabled  security-violatio Enabled  channel-misconfig Enabled  psecure-violation Enabled  dhcp-rate-limit Enabled  unicast-flood Enabled  vmps Enabled  pagp-flap Enabled  dtp-flap Enabled  link-flap Enabled  l2ptguard Enabled  gbic-invalid Enabled  loopback Enabled  dhcp-rate-limit Enabled  unicast-flood Enabled  從列表中,我們可以看出常見的原因有udld,bpduguard,link-flap以及loopback等。  具體由什麼原因導致當前接口err-disable可以由show interface status err-disable來查看。  在接口模式下采用shutdown,no shutdown進行手動的激活。  在缺省配置下,一旦接口被置為err-disable,IOS將不會試圖恢復接口。  這個可以由show errdisable recovery來查看,timer status下面所有的值都是disable.  下面的示例中,由於手工配置了bpduguard恢復,所以timer status的值變為Enable.  sw1#show errdisable recovery  ErrDisable Reason Timer Status  ----------------- --------------  udld Disabled  bpduguard Enabled  security-violatio Disabled  channel-misconfig Disabled  vmps Disabled  pagp-flap Disabled  dtp-flap Disabled  link-flap Disabled  l2ptguard Disabled  psecure-violation Disabled  gbic-invalid Disabled  dhcp-rate-limit Disabled  unicast-flood Disabled  loopback Disabled  Timer interval: 300 seconds  Interfaces that will be enabled at the next timeout:  Interface Errdisable reason Time left(sec)  --------- ----------------- --------------  Fa0/47 bpduguard 217  配置IOS重新激活errdisable的接口,使用以下命令:  sw1(config)#errdisable recovery cause bpduguard  sw1(config)#errdisable recovery cause ?  all Enable timer to recover from all causes  bpduguard Enable timer to recover from BPDU Guard error disable state  channel-misconfig Enable timer to recover from channel misconfig disable state  dhcp-rate-limit Enable timer to recover from dhcp-rate-limit error disable state  dtp-flap Enable timer to recover from dtp-flap error disable state  gbic-invalid Enable timer to recover from invalid GBIC error disable state  l2ptguard Enable timer to recover from l2protocol-tunnel error disable state  link-flap Enable timer to recover from link-flap error disable state  loopback Enable timer to recover from loopback detected disable state  pagp-flap Enable timer to recover from pagp-flap error disable state  psecure-violation Enable timer to recover from psecure violation disable state  security-violation Enable timer to recover from 802.1x violation disable state  udld Enable timer to recover from udld error disable state  unicast-flood Enable timer to recover from unicast flood disable state  vmps Enable timer to recover from vmps shutdown error disable  配置完上述命令後,IOS在一段時間後試圖恢復被置為err-disable的接口,這段時間缺省為300秒。  但是,如果引起err-disable的源沒有根治,在恢復工作後,接口會再次被置為err-disable.  調整err-disable的超時時間,可以使用以下命令:  sw1(config)#errdisable recovery interval ?  <30-86400> timer-interval(sec)  可以調整在30-86400秒,缺省是300秒。  如果產生err-disable的原因是udld,下面有一條命令非常管用:  sw1#udld reset

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