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如何解決cisco交換機(jī)的端口顯示err-disable錯(cuò)誤的問題
cisco交換機(jī)出現(xiàn)“err-disable”錯(cuò)誤的問題該怎么解決?關(guān)于接口處于err-disable的故障該再怎么排查,下面本文將詳細(xì)的講解關(guān)于cisco交換機(jī)出現(xiàn)“err-disable”問題的解決辦法,需要的朋友可以抱走。
故障癥狀:
線路不通,物理指示燈滅或者顯示為橙色(不同平臺(tái)指示燈狀態(tài)不同)
show interface 輸出顯示接口狀態(tài):
FastEthernet0/47 is down, line protocol is down (err-disabled)
接口狀態(tài)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(xiàn)了接口狀態(tài)為err-disable,show interfaces status err-disabled命令能查看觸發(fā)err-disable的原因。
下面示例原因?yàn)閎pduguard,在連接了交換機(jī)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(chǎn)生err-disable的原因可以由以下的命令來查看,系統(tǒng)缺省的配置是所有列出的原因都能導(dǎo)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l(fā)oopback等。
具體由什么原因?qū)е庐?dāng)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(jìn)行手動(dòng)的激活。
在缺省配置下,一旦接口被置為err-disable,IOS將不會(huì)試圖恢復(fù)接口。
這個(gè)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,由于手工配置了bpduguard恢復(fù),所以timer status的值變?yōu)镋nable.
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在一段時(shí)間后試圖恢復(fù)被置為err-disable的接口,這段時(shí)間缺省為300秒。
但是,如果引起err-disable的源沒有根治,在恢復(fù)工作后,接口會(huì)再次被置為err-disable.
調(diào)整err-disable的超時(shí)時(shí)間,可以使用以下命令:
sw1(config)#errdisable recovery interval ?
<30-86400>timer-interval(sec)
可以調(diào)整在30-86400秒,缺省是300秒。
如果產(chǎn)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.
同時(shí),接口在被置為err-disable的時(shí)候,通常有一系列的日志產(chǎn)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
收集這些日志也非常管用。
所以建議配置一個(gè)syslog server,收集log信息。
*************************
sw1#show interfaces status
Port Name Status Vlan Du…
***************
開啟errdisable功能,這樣可以使用show errdisable來查看引發(fā)errdisable的原因是什么,再更加信息內(nèi)容進(jìn)行解決。
******************
你要是想不影響使用的話,先用
no errdisable detect cause loopback
執(zhí)行一下,將已經(jīng)死掉的端口,no sh 一下
如果沒問題,肯定是環(huán)路了,你可再找時(shí)間,對(duì)懷疑有問題的switch用拔插法,一個(gè)一個(gè)拔掉網(wǎng)線去查,當(dāng)然,有更有效的方法,你可查看有問題的switch的所有rj45和gi口的狀態(tài),哪個(gè)有errdisable信息哪個(gè)就有問題。
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 這就是因?yàn)殒溌焚|(zhì)量不好導(dǎo)致的)
關(guān)閉errdisable detect
switch#no errdisable detect cause all
這樣就解決了cisco交換機(jī)的端口顯示“ err-disable”錯(cuò)誤了,謝謝閱讀,希望能幫到大家,請(qǐng)繼續(xù)關(guān)注,我們會(huì)努力分享更多優(yōu)秀的文章。
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