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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. 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.
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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