Verify that you are using the proper cable and interface (see your hardware installation documentation).ģ. Check the LEDs on the CSU/DSU to see whether the CD is active, or insert a breakout box on the line to check for the CD signal.Ģ. The router is not sensing a CD 2 signal (that is, the CD is not active).Ī telephone company problem has occurred-line is down or is not connected to CSU 3/DSU 4.ġ.
#LOOK N STOP SERIAL SERIAL#
Serial x is down, line protocol is down (DTE 1 mode) This is the proper status line condition. Serial x is administratively down, line protocol is downįigure 15-1 Output of the HDLC show interface serial Command.Serial x is up, line protocol is down (disabled).Serial x is up, line protocol is up (looped).Serial x is down, line protocol is down.You can identify five possible problem states in the interface status line of the show interfaces serial display (see Figure 15-1): Other fields shown in the display are described in detail in the section "Detailed Information on the show interfaces serial Command," later in this chapter. The following sections describe some of the important fields of the command output.
#LOOK N STOP SERIAL HOW TO#
This section describes how to use the show interfaces serial command to diagnose serial line connectivity problems in a wide-area network (WAN) environment.
Figure 15-1 shows the output of the show interfaces serial exec command for a High-Level Data Link Control (HDLC) serial interface. The output of the show interfaces serial exec command displays information specific to serial interfaces. Detailed Information on the show interfaces serial Command.Troubleshooting Using the show interfaces serial Command.The chapter consists of the following sections: This chapter presents general troubleshooting information and a discussion of tools and techniques for troubleshooting serial connections. Verifying That isdn switchtype and pri-group Are Configured Correctly
Troubleshooting Using the show controller e1 Command Troubleshooting Using the show isdn status Command Verify that isdn switchtype and pri-group Are Configured Correctly Transmit (Tx) Remote Alarm Indication (Yellow)įraming Loss Seconds Counter Is Increasing Receive (Rx) Remote Alarm Indication (Yellow) Receive (RX) Alarm Indication Signal (AIS) (Blue) Troubleshooting Using the show controller t1 Command Using Priority Queuing to Reduce BottlenecksĬSU and DSU Local Loopback Tests for HDLC or PPP LinksĬSU and DSU Remote Loopback Tests for HDLC or PPP Linksĭetailed Information on the show interfaces serial Command Serial Lines: Increasing Carrier Transitions Count on Serial Link Serial Lines: Increasing Interface Resets on Serial Link Serial Lines: Troubleshooting Serial Line Input Errors Serial Lines: Increasing Input Errors in Excess of 1 Percent of Total Interface Traffic Serial Lines: Increasing Input Drops on Serial Link
Serial Lines: Increasing Output Drops on Serial Link Serial Lines: show interfaces serial Status Line Conditions Troubleshooting Using the show interfaces serial Command
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