CISCO-端口出现err-disabled-现象解决案例.doc

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CISCO 端口出现err-disabled 现象解决案例两则 1# 发表于 2010-5-4 13:29 | 只看该作者 | 倒序看帖 | 打印关于接口处于err-disable的故障排查故障症状：线路不通，物理指示灯灭或者显示为橙色(不同平台指示灯状态不同) show interface 输出显示接口状态： FastEthernet0/47 is down, line protocol is down (err-disabled) 接口状态是err-disable。 sw1#show interfaces status Port Name Status Vlan Duplex Speed Type Fa0/47 err-disabled 1 auto auto 10/100BaseTX 如果出现了接口状态为err-disable，show interfaces status err-disabled命令能查看触发err-disable的原因。下面示例原因为bpduguard，在连接了交换机的端口配置了spanning-tree bpduguard enable。 sw1#show interfaces status err-disabled Port Name Status Reason Fa0/47 err-disabled bpduguard 接口产生err-disable的原因可以由以下的命令来查看，系统缺省的配置是所有列出的原因都能导致接口被置为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 从列表中，我们可以看出常见的原因有udld，bpduguard，link-flap以及loopback等。具体由什么原因导致当前接口err-disable可以由show interface status err-disable来查看。在接口模式下采用shutdown,no shutdown进行手动的激活。在缺省配置下，一旦接口被置为err-disable，IOS将不会试图恢复接口。这个可以由show errdisable recovery来查看，timer status下面所有的值都是disable。下面的示例中，由于手工配置了bpduguard恢复，所以timer status的值变为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 配置完上述命令后，IOS在一段时间后试图恢复被置为err-disable的接口，这段时间缺省为300秒。但是，如果引起err-disable的源没有根治，在恢复工作后，接口会再次被置为err-disable。调整err-disable的超时时间，可以使用以下命令： sw1(config)#errdisable recovery interval ? <30-86400> timer-interval(sec) 可以调整在30－86400秒，缺省是300秒。如果产生err-disable的原因是udld，下面有一条命令非常管用： sw1#udld reset No ports are disabled by UDLD. 同时，接口在被置为err-disable的时候，通常有一系列的日志产生，如下： *Mar 15 15:47:19.984: %SPANTREE-2-BLOCK_BPDUGUARD: Received BPDU on port FastEthernet0/47 with BPDU Guard enabled. Disabling port. sw1# *Mar 15 15:47:19.984: %PM-4-ERR_DISABLE: bpduguard error detected on Fa0/47, putting Fa0/47 in err-disable state sw1# *Mar 15 15:47:21.996: %LINK-3-UPDOWN: Interface FastEthernet0/47, changed state to down 收集这些日志也非常管用。所以建议配置一个syslog server，收集log信息。 ************************* sw1#show interfaces status Port Name Status Vlan Du... *************** 开启errdisable功能，这样可以使用show errdisable来查看引发errdisable的原因是什么，再更加信息内容进行解决。 ****************** 你要是想不影响使用的话，先用 no errdisable detect cause loopback 执行一下，将已经死掉的端口，no sh 一下如果没问题，肯定是环路了，你可再找时间，对怀疑有问题的switch用拔插法，一个一个拔掉网线去查，当然，有更有效的方法，你可查看有问题的switch的所有rj45和gi口的状态，哪个有errdisable信息哪个就有问题。 switch#show interfaces status err-disabled Port Name Status Reason Fa0/22 err-disabled link-flap Fa0/37 For office in 100K err-disabled link-flap Fa0/41 unknow err-disabled link-flap Fa0/42 Training Dc066 err-disabled link-flap Fa0/45 Production line VM err-disabled link-flap switch#show errdisable detect ErrDisable Reason Detection status ----------------- ---------------- pagp-flap Enabled dtp-flap Enabled link-flap Enabled l2ptguard Enabled gbic-invalid Enabled loopback Enabled switch#show interfaces status err-disabled Port Name Status Reason Fa0/22 err-disabled link-flap Fa0/37 For office in 100K err-disabled link-flap Fa0/41 unknow err-disabled link-flap Fa0/42 Training Dc066 err-disabled link-flap Fa0/45 Production line VM err-disabled link-flap switch#sh errdisable flap-values ErrDisable Reason Flaps Time (sec) ----------------- ------ ---------- pagp-flap 3 30 dtp-flap 3 30 link-flap 5 10 ( link-flap 这就是因为链路质量不好导致的) 关闭errdisable detect switch#no errdisable detect cause all 有一台Catalyst-3560G-24TS连着光纤线，旁边的端口（Gi0/28）插了一个光纤模块备用，过了一段时间发现备用端口提示port is error disabled，指示灯显示为橙色。可能是没有插紧，重新插拔，然后尝试激活端口。显示端口状态 sw1>show interfaces status Port Name Status Vlan Duplex Speed Type Gi0/1 connected 1 a-full a-100 10/100/1000BaseTX Gi0/2 notconnect 1 auto auto 10/100/1000BaseTX Gi0/3 connected 1 a-full a-1000 10/100/1000BaseTX ... Gi0/28 err-disabled 1 auto auto 1000BaseSX SFP 查看触发err-disable的原因 sw1>show interfaces status err-disabled Port Name Status Reason Gi0/28 err-disabled gbic-invalid 默认状态下，端口被置为err-disable后，IOS不会自动恢复端口。查看各种状态下IOS是否会自动恢复err-disable接口 sw1>show errdisable recovery ErrDisable Reason Timer Status ----------------- -------------- udld Disabled bpduguard Disabled 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 storm-control Disabled arp-inspection Disabled loopback Disabled 现在把gbic-invalid状态置为自动恢复就行了。进入configure终端模式：　 sw1>en Password: sw1#conf t Enter configuration commands, one per line. End with CNTL/Z. 配置IOS自动激活gbic-invalid导致的errdisable端口 sw1(config)#errdisable recovery cause gbic-invalid 确认配置是否成功 sw1>show errdisable recovery ErrDisable Reason Timer Status ----------------- -------------- udld Disabled bpduguard Disabled security-violatio Disabled channel-misconfig Disabled vmps Disabled pagp-flap Disabled dtp-flap Disabled link-flap Disabled l2ptguard Disabled psecure-violation Disabled gbic-invalid Enabled dhcp-rate-limit Disabled unicast-flood Disabled storm-control Disabled arp-inspection Disabled loopback Disabled IOS每隔300秒会试图恢复因gbic-invalid导致err-disable的端口。

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