1 路由器常用測試命令
show interfaces serial Command
顯示指定端口的狀態
Extended ping Tests
測試兩點間線路狀態
2 路由器傳輸故障排除方法
檢查端口及線路協議的狀態 (Interface and Line Protocol Status)
端口及線路協議的狀態共有以下六種
Serial x is up, line protocol is up
Serial x is down, line protocol is down
Serial x is up, line protocol is down
Serial x is up, line protocol is up (looped)
Serial x is administratively down, line protocol is down
下表給出解決方案
端口及線路協議狀態
錯誤原因
解決方案
Serial x is up,
line protocol is up
a 此狀態為正確狀態
Serial x is down,
line protocol is down
路由器未檢測到載波信號
1. 傳輸線路不通
2. 路由器的連接線未連接,或未連接正確。
3. 路由器硬件故障
步驟 1 檢測傳輸線路
步驟 2 檢查你是否使用正確的電纜與端 口
步驟 3 改換路由器另外端口,以確認是否為硬件故障
Serial x is up,
line protocol is down
1. 本地或遠程路由器配置錯誤
2. 遠程路由器未配置 keepalives 參數。