明白show line輸出的含義
Show line line-number EXEC是非常有用的trobbleshooting命令.
現(xiàn)象:MODEM和路由器間無連接.試用反登錄無反應(yīng)或用戶收到"Connection Refused by Foreign Host"信息.
建議:
用show line看MODEM一欄是否是"inout",若不是,在路由器上:
Router#conf t
Router(config)#line aux 0
Router(config-line)#modem inout
Router(config-line)#^Z
Router#
確定正確的線纜.
硬件問題,請與你的代理聯(lián)系.
現(xiàn)象:MODEM不撥號.
建議:MODEM不撥號,排除掉硬件,線纜的可能,就是:
不感興趣的包.用show running-config檢查路由器配置,是否設(shè)置了dialer-list截段了你想傳送的包,若是請重新配置access-list表.
Chat script配置錯(cuò)誤.打開debug信息.
Router#debug dialer
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down
%LINK-3-UPDOWN: Interface Serial0, changed state to down
%LINK-3-UPDOWN: Interface Async1, changed state to down
Async1: re-enable timeout
Async1: sending broadcast to default destination get_free_dialer: faking it
Async1: Dialing cause: Async1: ip PERMIT
Async1:No holdq created - not configured
Async1: Attempting to dial 8292
CHAT1: Attempting async line dialer script
CHAT1: Dialing using Modem script: backup & System script: none -- failed, not connected
CHAT1: process started
CHAT1: Asserting DTR
CHAT1: Chat script backup started
CHAT1: Expecting string:
Async1: sending broadcast to default destination -- failed, not connected
CHAT1: Timeout expecting:
CHAT1: Chat script backup finished, status = Connection timed out; remote host not responding
Async1: disconnecting call
......
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幀中繼連接的Troubleshooting
用show interface serial查看interface和line protocol是否up.確定連接的線纜正確.
如果interface is up,但line protocol是down.用show frame-relay lmi查看幀中繼的LMI類型.
用show frame-relay map查看打包類型.
用show frame-relay pvc查看PVC.
打開debug信息.
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X.25連接的Troubleshooting
確定兩個(gè)X.25端口連接上.
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