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To continue your PA-8T-232 port adapter installation, you must configure the PA-8T-232 interfaces. The instructions that follow apply to all supported platforms. Minor differences between the platforms---with Cisco IOS software commands---are noted.
This chapter contains the following sections:
You modify the configuration of your router through the software command interpreter called the EXEC (also called enable mode). You must enter the privileged level of the EXEC command interpreter with the enable command before you can use the configure command to configure a new interface or change the existing configuration of an interface. The system prompts you for a password if one has been set.
The system prompt for the privileged level ends with a pound sign (#) instead of an angle bracket (>). At the console terminal, use the following procedure to enter the privileged level:
Router> enable
Password:
Step 2 Enter the password (the password is case sensitive). For security purposes, the password is not displayed.
When you enter the correct password, the system displays the privileged-level system prompt (#):
Router#
To configure the new interfaces, proceed to the "Configuring the EIA/TIA-232 Interfaces" section.
After you verify that the new PA-8T-232 is installed correctly (the enabled LED goes on), use the privileged-level configure command to configure the new interfaces. Have the following information available:
If you installed a new PA-8T-232 or if you want to change the configuration of an existing interface, you must enter configuration mode to configure the new interfaces. If you replaced a PA-8T-232 that was previously configured, the system recognizes the new interfaces and brings each of them up in their existing configuration.
For a summary of the configuration options available and instructions for configuring interfaces on a PA-8T-232, refer to the appropriate configuration publications listed in the "Related Documentation" section.
You execute configuration commands from the privileged level of the EXEC command interpreter, which usually requires password access. Contact your system administrator, if necessary, to obtain password access. (See the "Using the EXEC Command Interpreter" section for an explanation of the privileged level of the EXEC.)
This section contains the following subsections:
Before you remove an interface that you will not replace, replace a compact serial cable, or replace port adapters, use the shutdown command to shut down (disable) the interfaces to prevent anomalies when you reinstall the new or reconfigured interface processor. When you shut down an interface, it is designated administratively down in the show command displays.
Follow these steps to shut down an interface:
Step 2 At the privileged-level prompt, enter configuration mode and specify that the console terminal is the source of the configuration subcommands, as follows:
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#
Step 3 Shut down interfaces by entering the interface serial subcommand (followed by the interface address of the interface) and then enter the shutdown command. Table 5-1 shows the command syntax.
When you are done, press Ctrl-Z (hold down the Control key while you press Z) or enter end or exit to exit configuration mode and return to the EXEC command interpreter.
| Platform | Command | Example |
|---|---|---|
Catalyst RSM/VIP2 in Catalyst 5000 family switches | interface, followed by the type (serial) and slot/port (port-adapter-slot-number/ | The example is for interface 0 and interface 1 on a port adapter in port adapter slot 1. Router(config-if)# interface serial 1/0 Router(config-if)# shutdown Router(config-if)# interface serial 1/1 Router(config-if)# shutdown Ctrl-Z Router# |
Catalyst 6000 family FlexWAN module in Catalyst 6000 family switches | interface, followed by the type (serial) and mod_num/bay/port (module-slot-number/ | The example is for interface 0 and interface 1 on a port adapter in port adapter bay 0 of a FlexWAN module installed in module slot 3. Router(config-if)# interface serial 3/0/0 Router(config-if)# shutdown Router(config-if)# interface serial 3/0/1 Router(config-if)# shutdown Ctrl-Z Router# |
Cisco 7120 series routers | interface, followed by the type (serial) and slot/port (port-adapter-slot-number/ | The example is for interface 0 and interface 1 on a port adapter in port adapter slot 3. Router(config-if)# interface serial 3/0 Router(config-if)# shutdown Router(config-if)# interface serial 3/1 Router(config-if)# shutdown Ctrl-Z Router# |
Cisco 7140 series routers | interface, followed by the type (serial) and slot/port (port-adapter-slot-number/ | The example is for interface 0 and interface 1 on a port adapter in port adapter slot 4. Router(config-if)# interface serial 4/0 Router(config-if)# shutdown Router(config-if)# interface serial 4/1 Router(config-if)# shutdown Ctrl-Z Router# |
Cisco 7200 series routers | interface, followed by the type (serial) and slot/port (port-adapter-slot-number/ | The example is for interface 0 and interface 1 on a port adapter in port adapter slot 6. Router(config-if)# interface serial 6/0 Router(config-if)# shutdown Router(config-if)# interface serial 6/1 Router(config-if)# shutdown Ctrl-Z Router# |
Cisco uBR7223 router | interface, followed by the type (serial) and slot/port (port-adapter-slot-number/ | The example is for interface 0 and interface 1 on a port adapter in port adapter slot 1. Router(config-if)# interface serial 1/0 Router(config-if)# shutdown Router(config-if)# interface serial 1/1 Router(config-if)# shutdown Ctrl-Z Router# |
Cisco uBR7246 router | interface, followed by the type (serial) and slot/port (port-adapter-slot-number/ | The example is for interface 0 and interface 1 on a port adapter in port adapter slot 2. Router(config-if)# interface serial 2/0 Router(config-if)# shutdown Router(config-if)# interface serial 2/1 Router(config-if)# shutdown Ctrl-Z Router# |
VIP2 in Cisco 7000 series or | interface, followed by the type (serial) and slot/port adapter/port (interface-processor-slot-number/ | The example is for interface 1 and interface 0 on a port adapter in port adapter slot 1 of a VIP2 installed Router(config-if)# interface serial 1/1/1 Router(config-if)# shutdown Router(config-if)# interface serial 1/1/0 Router(config-if)# shutdown Ctrl-Z Router# |
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Note If you need to shut down additional interfaces, enter the interface serial command (followed by the interface address of the interface) for each of the interfaces on your port adapter. Use the no shutdown command to enable the interface. |
Step 4 Write the new configuration to NVRAM as follows:
Router# copy running-config startup-config [OK] Router#
The system displays an OK message when the configuration has been stored in NVRAM.
Step 5 Verify that new interfaces are now in the correct state (shutdown) using the show interfaces serial command (followed by the interface address of the interface) to display the specific interface. Table 5-2 provides examples.
| Platform | Command | Example |
|---|---|---|
Catalyst RSM/VIP2 in Catalyst 5000 family switches | show interfaces serial, followed by slot/port (port-adapter-slot-number/ | The example is for interface 0 on a port adapter in port adapter slot 1. Router# show interfaces serial 1/0 Serial 1/0 is administratively down, line protocol is down [Additional display text omitted from this example] |
Catalyst 6000 family FlexWAN module in Catalyst 6000 family switches | show interfaces serial, followed by mod_num/bay/port (module-slot-number/ | The example is for interface 0 on a port adapter in port adapter bay of a Catalyst 6000 family FlexWAN modul in slot 3. Router# show interfaces serial 3/0/0 Serial 3/0/0 is administratively down, line protocol is down [Additional display text omitted from this example] |
Cisco 7120 series routers | show interfaces serial, followed by slot/port (port-adapter-slot-number/ | The example is for interface 0 on a port adapter in port adapter slot 3. Router# show interfaces serial 3/0 Serial 3/0 is administratively down, line protocol is down [Additional display text omitted from this example] |
Cisco 7140 series routers | show interfaces serial, followed by slot/port (port-adapter-slot-number/ | The example is for interface 0 on a port adapter in port adapter slot 4. Router# show interfaces serial 4/0 Serial 4/0 is administratively down, line protocol is down [Additional display text omitted from this example] |
Cisco 7200 series routers | show interfaces serial, followed by slot/port (port-adapter-slot-number/ | The example is for interface 0 on a port adapter in port adapter slot 6. Router# show interfaces serial 6/0 Serial 6/0 is administratively down, line protocol is down [Additional display text omitted from this example] |
Cisco uBR7223 router | show interfaces serial, followed by slot/port (port-adapter-slot- number/ | The example is for interface 0 on a port adapter in port adapter slot 1. Router# show interfaces serial 1/0 Serial 1/0 is administratively down, line protocol is down [Additional display text omitted from this example] |
Cisco uBR7246 router | show interfaces serial, followed by slot/port (port-adapter-slot-number/ | The example is for interface 0 on a port adapter in port adapter slot 2. Router# show interfaces serial 2/0 Serial 2/0 is administratively down, line protocol is down [Additional display text omitted from this example]
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VIP2 in Cisco 7000 series or Cisco 7500 series routers | show interfaces serial, followed by slot/port adapter/port (interface-processor-slot-number/ | The example is for interface 0 on a port adapter in port adapter slot 1 of a VIP2 in interface processor slot 1. Router# show interfaces serial 1/1/0 Serial 1/1/0 is administratively down, line protocol is down [Additional display text omitted from this example] |
Step 6 Reenable interfaces by doing the following:
a. Repeat Step 3 to reenable an interface. Substitute the no shutdown command for the shutdown command.
b. Repeat Step 4 to write the new configuration to memory. Use the copy running-config startup-config command.
c. Repeat Step 5 to verify that the interfaces are in the correct state. Use the show interfaces serial command followed by the interface address of the interface.
For complete descriptions of software configuration commands, refer to the publications listed in the "Related Documentation" section.
Following are instructions for a basic configuration: enabling an interface, specifying IP routing, and setting up external timing on a DCE interface. You might also need to enter other configuration subcommands, depending on the requirements for your system configuration and the protocols you plan to route on the interface. For complete descriptions of configuration subcommands and the configuration options available for serial interfaces, refer to the appropriate software documentation.
In the following procedure, press the Return key after each step unless otherwise noted. At any time you can exit the privileged level and return to the user level by entering disable at the prompt as follows:
Router# disable Router>
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#
Step 2 Specify the first interface to configure by entering the interface serial subcommand, followed by the interface address of the interface you plan to configure. Table 5-3 provides examples.
| Platform | Command | Example |
|---|---|---|
Catalyst RSM/VIP2 in Catalyst 5000 family switches | interface serial, followed by slot/port (port-adapter-slot-number/ | The example is for the first interface of a port adapter in port adapter slot 0. Router(config)# interface serial 0/0 Router(config-if)# |
Catalyst 6000 family FlexWAN module in Catalyst 6000 family switches | interface serial, followed by mod_num/bay/port (module-slot-number/ | The example is for the first interface of a port adapter in port adapter bay 0 of a Catalyst 6000 family FlexWAN module in interface processor slot 3. Router(config)# interface serial 3/0/0 Router(config-if)# |
Cisco 7120 series routers | interface serial, followed by slot/port (port-adapter-slot-number/ | The example is for the first interface of a Router(config)# interface serial 3/0 Router(config-if)# |
Cisco 7140 series routers | interface serial, followed by slot/port (port-adapter-slot-number/ | The example is for the first interface of a Router(config)# interface serial 4/0 Router(config-if)# |
Cisco 7200 series routers | interface serial, followed by slot/port (port-adapter-slot-number/ | The example is for the first interface of a Router(config)# interface serial 6/0 Router(config-if)# |
Cisco uBR7223 router | interface serial, followed by slot/port (port-adapter-slot-number/ | The example is for the first interface of a Router(config)# interface serial 1/0 Router(config-if)# |
Cisco uBR7246 router | interface serial, followed by slot/port (port-adapter-slot-number/ | The example is for the first interface of a Router(config)# interface serial 2/0 Router(config-if)# |
VIP2 in Cisco 7000 series or Cisco 7500 series routers | interface serial, followed by slot/port adapter/port (interface-processor-slot-number/ | The example is for the first interface of a Router(config)# interface serial 1/1/0 Router(config-if)# |
Step 3 Assign an IP address and subnet mask to the interface (if IP routing is enabled on the system) by using the ip address subcommand, as in the following example:
Router(config-if)# ip address 10.0.0.0 10.255.255.255
Step 4 Add any additional configuration subcommands required to enable routing protocols and set the interface characteristics.
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Note If you are configuring a DTE interface, proceed to Step 6. If you are configuring a DCE interface, you need to configure the external clock signal, which is described in Step 5. The example in Step 5 applies to all systems in which the PA-8T-232 is supported. |
Step 5 Set the clock rate using the clock rate command. (See the "Configuring Timing (Clock) Signals" section, which follows.)
Router(config-if)# clock rate 64000
Step 6 Reenable the interfaces using the no shutdown command. (See the "Shutting Down an Interface" section.)
Step 7 Configure all additional port adapter interfaces as required.
Step 8 After including all of the configuration subcommands to complete your configuration, press Ctrl-Z---hold down the Control key while you press Z---or enter end or exit to exit configuration mode and return to the EXEC command interpreter prompt.
Step 9 Write the new configuration to NVRAM as follows:
Router# copy running-config startup-config [OK] Router#
This completes the procedure for creating a basic configuration.
All EIA/TIA-232 interfaces support both DTE and DCE mode, depending on the mode of the compact serial cable attached to the port. To use a port as a DTE interface, you need only connect a DTE compact serial cable to the port. When the system detects the DTE mode cable, it automatically uses the external timing signal. To use a port in DCE mode, you must connect a DCE compact serial cable and set the clock speed with the clock rate configuration command. You must also set the clock rate to perform a loopback test. This section describes how to set the clock rate on a DCE port and, if necessary, how to invert the clock to correct a phase shift between the data and clock signals. Table 5-4 summarizes some of the commands used to configure the clock rate. See the specific sections that follow for further details.
| Purpose | Command | Example | Additional Information |
|---|---|---|---|
Set standard clock rate. | clock rate | The example is for a serial interface with a standard clock rate of 72 kbps. Router(config)# interface serial 3/0 Router(config-if)# clock rate 7200 | |
Set nonstandard clock rate. | clock rate | The example is for a serial interface with a nonstandard clock rate of 1234567 kbps. Router(config)# interface serial 3/0 Router(config-if)# clock rate 1234567 | |
Remove a clock rate that has been set. | no clock rate | The example is for a serial interface and removes a standard clock rate of 72 kbps. Router(config)# interface serial 3/0 Router(config-if)# clock rate 7200 Router(config-if)# no clock rate | |
Invert the transmit clock signal. | invert-txc | The example inverts the transmit clock signal for a serial interface. Router(config)# interface serial 3/0 Router(config-if)# invert-txc | |
Change the clock signal back to its original phase. | no invert-txc | The example sets the transmit clock signal for a serial interface back to its original phase. Router(config)# interface serial 3/0 Router(config-if)# no invert-txc | |
Invert the data signal. | invert data | The example inverts the data stream for both transmit and receive for a serial interface: Router(config)# interface serial 3/0 Router(config-if)# invert-txc |
The default operation on a PA-8T-232 DCE interface is for the DCE device to generate its own clock signal (TxC) and send it to the remote DTE. The remote DTE device returns the clock signal to the DCE (the PA-8T-232). Set the clock rate of an interface using the clock rate subcommand, which specifies the clock rate as a bits-per-second value.
Before you can assign a clock rate, you must use the interface serial command (followed by the interface address of the interface) to select the interface to which you want to assign the clock rate value.
In the following example, the clock rate is specified as 72 kbps:
Router(config-if)# clock rate 72000
The preceding command example applies to all systems in which the PA-8T-232 is supported. Use the no clock rate command to remove the clock rate.
Following are the standard clock rates:
1200, 2400, 4800, 9600, 19200 38400 , 56000 , 64000 ,
72000 , 125000 148000 , 250000, 500000, 800000, 1000000,
1300000, 2000000, 4000000, 8000000
When you are done, press Ctrl-Z---hold down the Control key while you press Z---or enter end or exit to exit configuration mode and return to the EXEC command interpreter prompt. Then write the new configuration to NVRAM using the copy running-config startup-config command.
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Note Cisco IOS Release 11.2(7a)P or later or Release 11.1(10)CA or later loaded on your Cisco 7200 series, Cisco 7000 series, or Cisco 7500 series router with a VIP2-40(=) supports nonstandard clock rates (any value from 1200 to 8000000) on PA-8T-232 interfaces. Cisco IOS Release 12.0(3)T or later or Release 12.0(1)XE or later support nonstandard clock rates on PA-8T-232 interfaces installed in Cisco 7204VXR and Cisco 7206VXR routers. Cisco IOS Release 11.3(7)NA or later or Release 12.0(3)T or later loaded on your Cisco uBR7200 series router supports nonstandard clock rates (any value from 1200 to 8000000) on PA-8T-232 interfaces. Nonstandard clock rates are rounded (if necessary) to the nearest clock rate that the hardware can support. |
Set a nonstandard clock rate for an interface using the clock rate subcommand. Before you can assign a nonstandard clock rate, you must use the interface serial command (followed by the interface address of the interface) to select the interface to which you want to assign the nonstandard clock rate value.
In the following example, a nonstandard clock rate of 1234567 bps is specified:
Router(config-if)# clock rate 1234567
The preceding command example applies to all systems in which the PA-8T-232 is supported. Use the no clock rate command to remove the clock rate.
When you are done, press Ctrl-Z---hold down the Control key while you press Z---or enter end or exit to exit configuration mode and return to the EXEC command interpreter prompt. Then write the new configuration to NVRAM using the copy running-config startup-config command.
The following example shows how to use the show running-config command to determine the exact clock rate to which the nonstandard clock rate was rounded:
Router# show running-config Building configuration... ... ! interface Serial1/0 (interface Serial3/1/0 on a VIP2 or FlexWAN module) no ip address clockrate 1151526 ! ...
In the preceding example, only the relevant output from the show running-config command is shown; other information is omitted.
Systems that use long cables or cables that are not transmitting the TxC (clock) signal might experience high error rates when operating at the higher transmission speeds. If a PA-8T-232 DCE port is reporting a high number of error packets, a phase shift might be the problem: inverting the clock might correct this phase shift.
When the EIA/TIA-232 interface is a DTE, the invert-txc command inverts the TxC signal the DTE receives from the remote DCE. When the EIA/TIA-232 interface is a DCE, the invert-txc command inverts the clock signal to the remote DTE port. Use the no invert-txc command to change the clock signal back to its original phase.
If you use an EIA/TIA-232 interface on the PA-8T-232 port adapter to drive a dedicated T1 line that does not have B8ZS encoding---a method to avoid 15 zeros---you must invert the data stream (both TXD and RXD) either in the connecting CSU/DSU or on the interface. To invert the data stream coming out of the PA-8T-232, use the invert data command. By inverting the HDLC data stream, the HDLC zero insertion algorithm becomes a ones insertion algorithm that satisfies the T1 requirements.
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Note Invert data only on the PA-8T-232 interface or on the CSU/DSU; inverting both cancel out both data inversions. |
Table 5-5 summarizes NRZI format commands. For more information, see the remainder of this section.
| Purpose | Command | Example | Further Information |
|---|---|---|---|
Enable NRZI encoding. | nrzi-encoding [mark]1 | The example is for a serial interface with NRZI mark encoding specified: Router(config)# interface serial 3/0 Router(config-if)# nrzi-encoding mark The example is for a serial interface with NRZI space encoding specified: Router(config)# interface serial 3/0 Router(config-if)# nrzi-encoding | |
Disable NRZI encoding. | no nrzi-encoding | The example disables NRZI encoding on a serial interface: Router(config)# interface serial 3/0 Router(config-if)# no nrzi-encoding |
All EIA/TIA-232 interfaces on the PA-8T-232 support nonreturn-to-zero (NRZ) and nonreturn-to-zero inverted (NRZI) formats. Both formats use two different voltage levels for transmission. NRZ signals maintain constant voltage levels with no signal transitions---no return to a zero voltage level---during a bit interval and are decoded using absolute values: 0 and 1. NRZI uses the same constant signal levels but interprets the absence of data---a space---at the beginning of a bit interval as a signal transition and the presence of data---a mark---as no signal transition. NRZI uses relational encoding to interpret signals rather than determining absolute values.
NRZ format---the factory default on all interfaces---is more common. NRZI format is commonly used with EIA/TIA-232 connections in IBM environments.
Enable NRZI encoding on any interface using the nrzi-encoding [mark] command, where no argument after the command is interpreted as a signal transition, and mark is interpreted as no signal transition. Before you can enable NRZI encoding, you must use the interface serial command (followed by the interface address of the interface) to select the interface on which you want to enable NRZI encoding.
In the example that follows, NRZI encoding with a signal transition--- no argument---is specified:
Router(config-if)# nrzi-encoding
In the example that follows, NRZI encoding with no signal transition---with argument---is specified:
Router(config-if)# nrzi-encoding mark
The preceding command examples apply to all systems in which the PA-8T-232 is supported.
Use the no nrzi-encoding command to disable NRZI encoding.
When you are done, press Ctrl-Z---hold down the Control key while you press Z---or enter end or exit to exit configuration mode and return to the EXEC command interpreter prompt. Then write the new configuration to NVRAM using the copy running-config startup-config command.
For complete command descriptions and instructions, refer to the Configuration Fundamentals Configuration Guide publication. For more information, see the "Cisco Connection Online" section and the "Documentation CD-ROM" section.
Table 5-6 summarizes cyclic redundancy check (CRC) commands. For more information, see the remainder of this section.
| Purpose | Command | Example | Further Information |
|---|---|---|---|
Enable 32-bit CRC. | crc size | The example enables 32-bit CRC on a serial interface: Router(config)# interface serial 3/0 Router(config-if)# crc 32 | |
Return to default 16-bit CRC. | no crc size | The example disables 32-bit CRC on a serial interface and returns to the default 16-bit CRC: Router(config)# interface serial 3/0 Router(config-if)# no crc 32 |
CRC is an error-checking technique that uses a calculated numeric value to detect errors in transmitted data. All interfaces use a 16-bit CRC (CRC-CITT) by default but also support a 32-bit CRC. The sender of a data frame calculates the frame check sequence (FCS). Before it sends a frame, the sender appends the FCS value to the message. The receiver recalculates the FCS and compares its calculation to the FCS from the sender. If there is a difference between the two calculations, the receiver assumes that a transmission error occurred and sends a request to the sender to resend the frame.
Enable 32-bit CRC using the crc 32 command. Before you can enable 32-bit CRC, you must use the interface serial command (followed by the interface address of the interface) to select the interface on which you want to enable 32-bit CRC. This command functions in the same way on all supported platforms.
In the example that follows, 32-bit CRC is specified:
Router(config-if)# crc 32
The preceding command example applies to all systems in which the PA-8T-232 is supported. Use the no crc 32 command to disable CRC-32 and return the interface to the default CRC-16 (CRC-CITT) setting.
When you are done, press Ctrl-Z---hold down the Control key while you press Z---or enter end or exit to exit configuration mode and return to the EXEC command interpreter prompt. Then write the new configuration to NVRAM using the copy running-config startup-config command.
For command descriptions, refer to the Configuration Fundamentals Configuration Guide publication. For more information, see the "Cisco Connection Online" section and the "Documentation CD-ROM" section.
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Note If you are configuring a PA-8T-232 on a Cisco 7200 series router and you want to configure the interface for half-duplex or Bisync operation, proceed to the next section "Configuring Half-Duplex and Binary Synchronous Communications in Cisco 7200 Series Routers"; otherwise, proceed to the "Checking the Configuration" section. |
This section explains how to configure EIA/TIA-232 interfaces for half-duplex and Bisync operation in Cisco 7200 series routers.
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Note Cisco IOS Release 11.2(7a)P or later supports half-duplex and Bisync operation on the PA-8T-232 in Cisco 7200 series routers. Cisco IOS Release 12.0(3)T or later or Release 12.0(1)XE or later supports nonstandard clock rates on PA-8T-232 interfaces installed in Cisco 7204VXR and Cisco 7206VXR routers. Cisco 7100 series routers, Cisco uBR7200 series routers, the VIP2, the Catalyst 6000 family FlexWAN module, and the Catalyst RSM/VIP2 do not support half-duplex and Bisync operation on the PA-8T-232. |
Use the half-duplex command to configure EIA/TIA-232 interfaces for half-duplex mode; full-duplex mode is the default for low-speed serial interfaces. Serial DCE interfaces in half-duplex mode can be configured for controlled-carrier mode or constant-carrier mode; constant-carrier mode is the default. Controlled-carrier mode sets the EIA/TIA-232 interface to deactivate Data Carrier Detect (DCD) until a transmission is sent to the interface. After a transmission is received, DCD is activated and the interface waits a user-configured amount of time and then transmits the data. After the transmission, the interface waits a user-configured amount of time and then deactivates DCD. Constant-carrier mode activates DCD at all times.
Use the half-duplex controlled-carrier command to configure an EIA/TIA-232 interface for controlled-carrier mode. Use the no half-duplex controlled-carrier command to return the interface to constant-carrier mode.
Follow these steps to configure controlled-carrier mode on an EIA/TIA-232 interface:
Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#
Step 2 Specify the interface to configure for controlled-carrier mode using the interface serial subcommand (followed by the interface address of the interface) and then enter the half-duplex controlled-carrier subcommand.
The following example is for the first interface of the port adapter in port adapter slot 1:
Router(config)# interface serial 1/0 Router(config-if)# half-duplex controlled-carrier
Step 3 Specify the length of the timer delay the interface uses when it is configured for controlled-carrier mode by using the following command:
half-duplex timer {cts-delay value | cts-drop-timeout value | dcd-drop-delay value | dcd-txstart-delay value | rts-drop-delay value | rts-timeout value | transmit-delay value}
where value is the length of the timer delay in milliseconds.
The following example specifies a Data Carrier Detect (DCD) drop delay of 100 milliseconds on the first interface of a port adapter in port adapter slot 1:
Router(config)# interface serial 1/0 Router(config-if)# half-duplex timer dcd-drop-delay 100 ms
Table 5-7 lists the default delay settings and the value argument for each timer you can use with the half-duplex timer command.
| Timer | Command Syntax | Default Settings1 |
|---|---|---|
CTS delay2 | half-duplex timer cts-delay | 0 |
CTS drop timeout | half-duplex timer cts-drop-timeout | 250 |
DCD drop delay3 | half-duplex timer dcd-drop-delay | 100 |
DCD transmission start delay | half-duplex timer dcd-txstart-delay | 100 |
RTS drop delay4 | half-duplex timer rts-drop-delay | 3 |
RTS timeout | half-duplex timer rts-timeout | 3 |
Transmit delay | half-duplex transmit-delay | 0 |
| 1In milliseconds (ms). 2Clear to Send (CTS). 3Data Carrier Detect (DCD). 4Request to Send (RTS). |
Step 4 Complete the configuration by pressing Ctrl-Z---hold down the Control key while you press Z---or entering end or exit to exit configuration mode and return to the EXEC command interpreter prompt.
Step 5 Write the new configuration to NVRAM as follows:
Router# copy running-config startup-config [OK] Router#
This completes the procedure for configuring controlled-carrier mode on an EIA/TIA-232 interface. For additional information on configuring half-duplex operation on low-speed serial interfaces, refer to the chapter "Configuring Interfaces" of the Configuration Fundamentals Configuration Guide publication. For more information, see the "Cisco Connection Online" section and the "Documentation CD-ROM" section.
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Note To configure EIA/TIA-232 interfaces for Binary Synchronous (Bisync) operation in Cisco 7200 series routers, refer to the "Block Serial Tunneling (BSTUN)" section of the "Configuring Serial Tunnel (STUN) and Block Serial Tunnel (BSTUN)" chapter of the Bridging and IBM Networking Configuration Guide. |
After configuring the new interface, use the show commands to display the status of the new interface or all interfaces, and use the ping and loopback commands to check connectivity. This section includes the following subsections:
Table 5-8 demonstrates how you can use the show commands to verify that new interfaces are configured and operating correctly and that the PA-8T-232 appears in them correctly. Sample displays of the output of selected show commands appear in the sections that follow. For complete command descriptions and examples, refer to the publications listed in the "Related Documentation" section.
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Note The ouputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only. |
| Command | Function | Example | ||
|---|---|---|---|---|
show version or | Displays system hardware configuration, the number of each interface type installed, Cisco IOS software version, names and sources of configuration files, and boot images | Router# show version | ||
show controllers | Displays all the current interface processors and their interfaces | Router# show controllers | ||
show diag slot
| Displays types of port adapters installed in your system and information about a specific port adapter slot, interface processor slot, or chassis slot | Router# show diag 2 | ||
show interfaces type 0 or 1/ | Displays status information about a specific type of interface (for example, serial) on a Catalyst RSM/VIP2 | Router# show interfaces serial 1/0 | ||
show interfaces type module-slot-number/ | Displays status information about a specific type of interface (for example, serial) on a Catalyst 6000 family FlexWAN module | Router# show interfaces serial 3/0/0 | ||
show interfaces type 3/interface-port- | Displays status information about a specific type of interface (for example, serial) in a Cisco 7120 series router | Router# show interfaces serial 3/1 | ||
show interfaces type 4/interface-port- | Displays status information about a specific type of interface (for example, serial) in a Cisco 7140 series router | Router# show interfaces serial 4/1 | ||
show interfaces type port-adapter-slot-number/ | Displays status information about a specific type of interface (for example, serial) in a Cisco 7200 series router | Router# show interfaces serial 1/0 | ||
show interfaces type 1/interface-port- | Displays status information about a specific type of interface (for example, serial) in a Cisco uBR7223 router | Router# show interfaces serial 1/1 | ||
show interfaces type 1 or 2/ | Displays status information about a specific type of interface (for example, serial) in a Cisco uBR7246 router | Router# show interfaces serial 2/0 | ||
show interfaces type interface-processor- | Displays status information about a specific type of interface (for example, serial) on a VIP2 in a Cisco 7000 series or Cisco 7500 series router | Router# show interfaces serial 3/1/0 | ||
show protocols | Displays protocols configured for the entire system and for specific interfaces | Router# show protocols | ||
show running-config | Displays the running configuration file | Router# show running-config | ||
show startup-config | Displays the configuration stored in NVRAM | Router# show startup-config |
If an interface is shut down and you configured it as up, or if the displays indicate that the hardware is not functioning properly, ensure that the interface is properly connected and terminated. If you still have problems bringing up the interface, contact a service representative for assistance. This section includes the following subsections:
Choose the subsection appropriate for your system. Proceed to the "Using the ping Command to Verify Network Connectivity" section when you have finished using the show commands.
Display the configuration of the system hardware, the number of each interface type installed, the Cisco IOS software version, the names and sources of configuration files, and the boot images, using the show version (or show hardware) command.
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Note The ouputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only. |
Following is an example of the show version command from a Catalyst 5000 series switch:
Router# show version Cisco Internetwork Operating System Software IOS (tm) C5RSM Software (C5RSM-JSV-M), Version 11.2(9)P Copyright (c) 1986-1997 by cisco Systems, Inc. Compiled Tue 24-Jun-97 17:09 by biff Image text-base: 0x600108E0, data-base: 0x6095E000 ROM: System Bootstrap, Version 11.2(15707) BOOTFLASH: C5RSM Software (C5RSM-JSV-M), Version 11.2 Router uptime is 17 hours, 17 minutes System restarted by reload System image file is "c5rsm-jsv-mz.7P", booted via tftp cisco RSP2 (R4700) processor with 32768K bytes of memory. R4700 processor, Implementation 33, Revision 1.0 Last reset from power-on G.703/E1 software, Version 1.0. SuperLAT software copyright 1990 by Meridian Technology Corp). Bridging software. X.25 software, Version 2.0, NET2, BFE and GOSIP compliant. TN3270 Emulation software. 1 C5IP controller (15 Vlan). 2 MIP controllers (4 E1). 1 VIP2 controller (2 E1)(4 Token Ring). 6 Channelized E1/PRI ports. 123K bytes of non-volatile configuration memory. 16384K bytes of Flash PCMCIA card at slot 0 (Sector size 128K). 8192K bytes of Flash internal SIMM (Sector size 256K). Configuration register is 0x100
Following is an example of the show version command from a Catalyst 6000 series switch:
Router# show version Cisco Internetwork Operating System Software IOS (tm) MSFC Software (C6MSFC-JSV-M), Experimental Version 12.1(20000209:134547) [amcrae-cosmos_e_nightly 163] Copyright (c) 1986-2000 by cisco Systems, Inc. Compiled Wed 09-Feb-00 07:10 by Image text-base: 0x60008900, data-base: 0x6140E000 ROM: System Bootstrap, Version 12.0(3)XE, RELEASE SOFTWARE const-uut uptime is 5 minutes System returned to ROM by reload System image file is "bootflash:c6msfc-jsv-mz.Feb9" cisco Cat6k-MSFC (R5000) processor with 122880K/8192K bytes of memory. Processor board ID SAD03457061 R5000 CPU at 200Mhz, Implementation 35, Rev 2.1, 512KB L2 Cache Last reset from power-on Channelized E1, Version 1.0. Bridging software. X.25 software, Version 3.0.0. SuperLAT software (copyright 1990 by Meridian Technology Corp). TN3270 Emulation software. Primary Rate ISDN software, Version 1.1. 6 FlexWAN controllers (13 Serial)(8 E1)(8 T1)(2 HSSI)(2 ATM)(1 Channelized T3)(1 Channelized E3)(2 POS). 1 Virtual Ethernet/IEEE 802.3 interface(s) 17 Serial network interface(s) (Additional display text omitted from this example] 123K bytes of non-volatile configuration memory. 4096K bytes of packet SRAM memory. 16384K bytes of Flash internal SIMM (Sector size 256K). Configuration register is 0x1
Following is an example of the show version command from a Cisco 7120 series router:
Router# show version Cisco Internetwork Operating System Software IOS (tm) EGR Software (c7100-P-M), Release Version 12.0(2) [biff] Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Thu 15-Apr-99 17:49 by biff Image text-base:0x600088F8, data-base:0x60A54000 ROM:System Bootstrap, Version 12.0(2) [biff], RELEASE SOFTWARE BOOTFLASH:EGR Software (c7100-BOOT-M), Release Version 12.0(2) [biff] Router uptime is 19 minutes System restarted by reload System image file is "c7100-p-mz" cisco 7120-T3 (EGR) processor with 61440K/69632K bytes of memory. R527x CPU at 225Mhz, Implementation 40, Rev 10.0, 2048KB L2 Cache Last reset from power-on X.25 software, Version 3.0.0. 8 Serial network interface(s) 125K bytes of non-volatile configuration memory. 4096K bytes of Flash internal SIMM (Sector size 256K). Configuration register is 0x2000
Following is an example of the show version command from a Cisco 7200 series router:
Router# show version Cisco Internetwork Operating System Software IOS (tm) 7200 Software (C7200-J-M), Version 11.1(7)CA [biff 105] Copyright (c) 1986-1996 by cisco Systems, Inc. Compiled Sun 04-Aug-96 06:00 by biff Image text-base: 0x600088A0, data-base: 0x605A4000 ROM: System Bootstrap, Version 11.1(7)CA RELEASED SOFTWARE Router uptime is 4 hours, 22 minutes System restarted by reload System image file is "c7200-j-mz", booted via slot0 cisco 7206 (NPE150) processor with 12288K/4096K bytes of memory. R4700 processor, Implementation 33, Revision 1.0 (Level 2 Cache) Last reset from power-on Bridging software. SuperLAT software (copyright 1990 by Meridian Technology Corp). X.25 software, Version 2.0, NET2, BFE and GOSIP compliant. TN3270 Emulation software (copyright 1994 by TGV INC). Chassis Interface. 4 Ethernet/IEEE 802.3 interfaces. 2 FastEthernet/IEEE 802.3 interfaces. 4 Token Ring /IEEE802.5 interfaces. 12 Serial network interfaces. 1 Compression port adapter. 125K bytes of non-volatile configuration memory. 1024K bytes of packet SRAM memory. 20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K). 8192K bytes of Flash internal SIMM (Sector size 256K). Configuration register is 0x2
Following is an example of the show version command from a Cisco 7500 series router:
Router# show version Cisco Internetwork Operating System Software IOS (tm) GS Software (RSP-A), Version 11.1(7)CA [biff 125] Copyright (c) 1986-1996 by cisco Systems, Inc. Compiled Sat 10-Aug-96 17:56 by biff Image text-base: 0x600108A0, data-base: 0x60952000 ROM: System Bootstrap, Version 5.3(16645) [biff 571], RELEASE SOFTWARE ROM: GS Software (RSP-BOOT-M), Version 11.1(7)CA, RELEASE SOFTWARE (fc1) Router uptime is 5 days, 4 minutes System restarted by reload System image file is "rsp-jv-mz", booted via slot0 cisco RSP2 (R4600) processor with 16384K bytes of memory. R4600 processor, Implementation 32, Revision 2.0 Last reset from power-on G.703/E1 software, Version 1.0. SuperLAT software (copyright 1990 by Meridian Technology Corp). Bridging software. X.25 software, Version 2.0, NET2, BFE and GOSIP compliant. TN3270 Emulation software (copyright 1994 by TGV Inc). Chassis Interface. 1 EIP controller (6 Ethernet). 1 VIP2 controller (8 Ethernet)(1 HSSI). 14 Ethernet/IEEE 802.3 interfaces. 1 HSSI network interface. 125K bytes of non-volatile configuration memory. 8192K bytes of Flash PCMCIA card at slot 0 (Sector size 128K). 8192K bytes of Flash internal SIMM (Sector size 256K). Configuration register is 0x0
Display the types of port adapters installed in your system (and specific information about each) using the show diag slot command, where slot is the port adapter slot in a Cisco 7100 series, Cisco 7200 series, and Cisco uBR7200 series router and the interface processor slot in a Cisco 7000 series or Cisco 7500 series router with a VIP2.
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Note The ouputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only. |
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Note The slot argument is not required for Catalyst 5000 family switches. |
Following is an example of the show diag command that shows a PA-8T-232 in a Catalyst RSM/VIP2:
Router# show diag
Slot 0:
Physical slot 0, ~physical slot 0xF, logical slot 0, CBus 1
Microcode Status 0x4
Master Enable, LED, WCS Loaded
Board is analyzed
Pending I/O Status: Console I/O, Debug I/O
EEPROM format version 1
C5IP controller, HW rev 1.0, board revision A0
Serial number: 00000001 Part number: 00-0000-01
Test history: 0x00 RMA number: 00-00-00
Flags: cisco 7000 board; 7500 compatible
EEPROM contents (hex):
0x20: 01 1C 01 00 00 00 00 01 00 00 00 01 00 00 00 00
0x30: 50 00 00 00 00 00 00 00 00 00 00 78 00 00 00 00
Slot database information:
Flags: 0x4 Insertion time: 0xFAC (17:24:40 ago)
Slot 7:
EEPROM format version 1
Route/Switch Processor 2, HW rev 1.0, board revision A0
Serial number: 00000001 Part number: 00-0000-01
Test history: 0x00 RMA number: 00-00-00
Flags: cisco 7000 board; 7500 compatible
EEPROM contents (hex):
0x20: 01 1C 01 00 00 00 00 01 00 00 00 01 00 00 00 00
0x30: 50 00 00 00 00 00 00 00 00 00 00 78 00 00 00 00
.
.
.
PA Bay 0 Information:
Mueslix Serial PA, 8 ports
EEPROM format version 1
HW rev 1.0, Board revision A0
Serial number: 4294967295 Part number: 255-65535-255
PA Bay 1 Information:
Fast-Serial PA, 4 ports
EEPROM format version 1
HW rev 1.0, Board revision A0
Serial number: 02024473 Part number: 73-1389-05
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Note The slot values 0 and 7 are not relevant to any physical connection; disregard these slot values. |
Following is an example of the show diag command that shows a PA-8T-232 in a Catalyst 6000 family FlexWAN module:
Router# show diag
(Additional display text omitted from this example]
Slot 8: Logical_index 17
Board is analyzed ipc ready FlexWAN controller
Slot database information:
Flags: 0x2004 Insertion time: unknown
CWAN Controller Memory Size: Unknown
PA Bay 1 Information:
Mx Serial PA, 8 ports
EEPROM format version 0
HW rev 0.00, Board revision UNKNOWN
Serial number: 00000000 Part number: 00-0000-00
Following is an example of the show diag slot command that shows a PA-8T-232 in port adapter slot 3 of a Cisco 7120 series router:
Router# show diag 3 Slot 3: Mueslix serial (RS232) port adapter, 8 ports Port adapter is analyzed Port adapter insertion time 2d09h ago Hardware revision 255.255 Board revision A0 Serial number 4294967295 Part number 255-65535-255 Test history 0xFF RMA number 255-255-255 EEPROM format version 1 EEPROM contents (hex): 0x20: 01 0D FF FF FF FF FF FF FF FF FF FF FF FF FF FF 0x30: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
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Note To use the show diag command with the Cisco 7140 series router, replace the slot argument 3 with 4. |
Following is an example of the show diag slot command that shows a PA-8T-232 in port adapter slot 1:
Router# show diag 1 Slot 1: Mueslix serial (RS232) port adapter, 8 ports Port adapter is analyzed Port adapter insertion time 2d09h ago Hardware revision 255.255 Board revision UNKNOWN Serial number 4294967295 Part number 255-65535-255 Test history 0xFF RMA number 255-255-255 EEPROM format version 1 EEPROM contents (hex): 0x20: 01 0D FF FF FF FF FF FF FF FF FF FF FF FF FF FF 0x30: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
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Note Port adapters used with Cisco 7200 VXR routers require the correct base hardware revision in order to function. The following error message occurs on bootup if the incorrect hardware revision is used: > PA-3-REVNOTSUPPORTED:PA in slot 1 (Ethernet) requires base h/w revision of (1.14) for this chassisUse the show diag command to display the hardware revision. |
Following is an example of the show diag slot command that shows a PA-8T-232 in port adapter slot 0 on a VIP2 in interface processor slot 1:
Router# show diag 1
Slot 1:
Mueslix serial (RS232) port adapter, 8 ports
Port adapter is analyzed
Port adapter insertion time 2d09h ago
Hardware revision 1.4 Board revision UNKNOWN
Serial number 4294967295 Part number 255-65535-255
Test history 0xFF RMA number 255-255-255
EEPROM format version 1
EEPROM contents (hex):
0x20:01 0F 01 04 FF FF FF FF FF FF FF FF FF FF FF FF
0x30:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
Slot database information:
Flags: 0x4 Insertion time: 0x12A0 (08:56:58 ago)
Controller Memory Size: 8 MBytes
PA Bay 0 Information:
Mueslix Serial PA, 8 ports
EEPROM format version 1
HW rev 1.0, Board revision A0
Serial number: 4294967295 Part number: 255-65535-255
PA Bay 1 Information:
Fast-Serial PA, 4 ports
EEPROM format version 1
HW rev 1.0, Board revision A0
Serial number: 02024473 Part number: 73-1389-05
For complete descriptions of interface subcommands and the configuration options available for Catalyst RSM/VIP2, Cisco 7100 series, Cisco 7200 series, Cisco uBR7200 series, and VIP2 interfaces, refer to the publications listed in the "Related Documentation" section.
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Note The ouputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only. |
Router# show interfaces serial 1/0 Serial1/0 is up, line protocol is up Hardware is cyBus Serial Internet address is 10.0.0.0 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation HDLC, loopback not set, keepalive not set (Additional display text omitted from this example] Router# show interfaces serial 1/1 Serial1/1 is up, line protocol is up Hardware is cyBus Serial Internet address is 10.0.0.1 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation HDLC, loopback not set, keepalive not set (Additional display text omitted from this example] Router# show interfaces serial 1/2 Serial1/2 is up, line protocol is up Hardware is cyBus Serial Internet address is 10.0.0.2 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation HDLC, loopback not set, keepalive not set (Additional display text omitted from this example] Router# show interfaces serial 1/3 Serial1/3 is up, line protocol is up Hardware is cyBus Serial Internet address is 10.0.0.3 MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255 Encapsulation HDLC, loopback not set, keepalive not set (Additional display text omitted from this example]
Following is an example of the show interfaces serial command, which shows all of the information specific to interface 0 on a PA-8T-232 port adapter in port adapter bay 1 of a Catalyst 6000 family FlexWAN module in module slot 8:
Router# show interfaces serial 3/0/0
Serial8/1/0 is administratively down, line protocol is down
Hardware is Serial
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
(Additional display text omitted from this example]
Serial8/1/1 is administratively down, line protocol is down
Hardware is Serial
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
(Additional display text omitted from this example]
Serial8/1/2 is administratively down, line protocol is down
Hardware is Serial
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
(Additional display text omitted from this example]
Following is an example of the show interfaces serial command, which shows all of the information specific to interface 0 on a PA-8T-232 installed in port adapter slot 3 of a Cisco 7120 series router:
Router# show interfaces serial 3/0
Serial3/0 is up, line protocol is up
Hardware is M8T-RS232
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input never, output 1d17h, output hang never
Last clearing of "show interface" counters never
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
24 packets output, 5137 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions DCD=down DSR=down DTR=down RTS=down CTS=down
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Note To use the show interfaces serial command with the Cisco 7140 series router, replace the interface address argument 3/0 with 4/0. |
Following is an example of the show interfaces serial command, which shows all of the information specific to interface port 0 on a PA-8T-232 port adapter installed in port adapter slot 1:
Router# show interfaces serial 1/0
Serial1/0 is up, line protocol is up
Hardware is M8T-RS232
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input never, output 1d17h, output hang never
Last clearing of "show interface" counters never
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
24 packets output, 5137 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions DCD=down DSR=down DTR=down RTS=down CTS=down
Following is an example of the show interfaces serial command, which shows all of the information specific to interface 0 on a PA-8T-232 port adapter in port adapter slot 1 of a VIP2 in interface processor slot 3:
Router# show interfaces serial 3/1/0
Serial3/1/0 is up, line protocol is up
Hardware is cyBus Serial
Internet address is 10.0.0.0
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive not set
Last input 2d18h, output 00:00:54, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/64/0 (size/threshold/drops)
Conversations 0/1 (active/max active)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
16 packets input, 1620 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 1 ignored, 0 abort
3995 packets output, 1147800 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
1 carrier transitions
RTS up, CTS up, DTR up, DCD up, DSR up
Using the ping command, you can verify that an interface port is functioning properly. This section provides a brief description of this command. Refer to the publications listed in the "Related Documentation" section for detailed command descriptions and examples.
The ping command sends echo request packets out to a remote device at an IP address that you specify. After sending an echo request, the system waits a specified time for the remote device to reply. Each echo reply is displayed as an exclamation point (!) on the console terminal; each request that is not returned before the specified timeout is displayed as a period (.). A series of exclamation points (!!!!!) indicates a good connection; a series of periods (.....) or the messages [timed out] or [failed] indicates a bad connection.
Following is an example of a successful ping command to a remote server with the address 10.0.0.10:
Router# ping 10.0.0.10 <Return> Type escape sequence to abort. Sending 5, 100-byte ICMP Echoes to 10.0.0.10, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/15/64 ms Router#
If the connection fails, verify that you have the correct IP address for the destination and that the device is active (powered on), and repeat the ping command.
The loopback test allows you to detect and isolate equipment malfunctions by testing the connection between the PA-8T-232 interface and a remote device such a modem or a CSU/DSU. The loopback subcommand places an interface in loopback mode, which enables test packets that are generated from the ping command to loop through a remote device or compact serial cable. If the packets complete the loop, the connection is good. If not, you can isolate a fault to the remote device or compact serial cable in the path of the loopback test.
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Note You must configure a clock rate on the port before performing a loopback test. However, if no cable is attached to the port, the port is administratively up, and the port is in loopback mode; you do not have to configure a clock rate on the port before performing a loopback test. |
Depending on the mode of the port, issuing the loopback command checks the following path:
Posted: Fri Mar 3 10:15:39 PST 2000
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