PA-4E 10BaseT Ethernet Port Adapter Installation and Configuration
Configuring the PA-4E 10BaseT Ethernet Port Adapter
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Configuring the PA-4E

Table Of Contents

Configuring the PA-4E

Using the EXEC Command Interpreter

Configuring the Interfaces

Shutting Down an Interface

Performing a Basic Configuration

Checking the Configuration

Using show Commands to Verify the New Interface Status

Using show version or show hardware Commands

Using the show diag Command

Using the show interfaces Command

Using the ping Command to Verify Network Connectivity

Using loopback Commands


Configuring the PA-4E


To continue your PA 4E port adapter installation, you must configure the 4E interfaces. The instructions that follow apply to all supported platforms. Minor differences between the platforms—with Cisco IOS software commands—are note.d This chapter contains the following sections:

Using the EXEC Command Interpreter

Configuring the Interfaces

Checking the Configuration

Using the EXEC Command Interpreter

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:


Step 1 At the user-level EXEC prompt, enter the enable command. The EXEC prompts you for a privileged-level password as follows:

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 Interfaces" section.


Configuring the Interfaces

After you verify that the new PA-4E is installed correctly (the enabled LED goes on), use the privileged-level configure command to configure the new interfaces. Have the following information available:

Protocols you plan to route on each new interface

IP addresses, if you plan to configure the interfaces for IP routing

Bridging protocols you plan to use

If you installed a new PA-4E 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-4E 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-4E, refer to the appropriate publications listed in the "Related Documentation" section on page viii.

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:

Shutting Down an Interface

Performing a Basic Configuration


Note The 4E interfaces can be configured at 10 Mbps, full duplex (FDX), for a maximum aggregate bandwidth of 40 Mbps.


Shutting Down an Interface

Before you remove an interface that you will not replace, 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 1 Enter the privileged level of the EXEC command interpreter (also called enable mode). (See the "Using the EXEC Command Interpreter" section for instructions.)

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 ethernet subcommand (followed by the interface address of the interface), and then enter the shutdown command. Table 4-1 shows the command syntax.

When you have finished, 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.

Table 4-1 Syntax of the shutdown Command 

Platform
Command
Example

Catalyst RSM/VIP2 in Catalyst 5000 family switches

interface, followed by the type (ethernet) and slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 and interface 1 on a port adapter in port adapter slot 0.

Router(config-if)# interface ethernet 0/0
Router(config-if)# shutdown
Router(config-if)# interface ethernet 0/1
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco 7120 series routers

interface, followed by the type (ethernet) and slot/port (port-adapter-slot number/ interface-port-number)

The example is for interface 0 and interface 1 on a port adapter in port adapter slot 3.

Router(config-if)# interface ethernet 3/0
Router(config-if)# shutdown
Router(config-if)# interface ethernet 3/1
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco 7140 series routers

interface, followed by the type (ethernet) and slot/port (port-adapter-slot number/ interface-port-number)

The example is for interface 0 and interface 1 on a port adapter in port adapter slot 4.

Router(config-if)# interface ethernet 4/0
Router(config-if)# shutdown
Router(config-if)# interface ethernet 4/1
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco 7200 series routers

interface, followed by the type (ethernet) and slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 and interface 1 on a port adapter in port adapter slot 6.

Router(config-if)# interface ethernet 6/0
Router(config-if)# shutdown
Router(config-if)# interface ethernet 6/1
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco uBR7223 router

interface, followed by the type (ethernet) and slot/port (port-adapter-slot-number/
interface-port-number)

The example is for interface 0 and interface 1 on a port adapter in port adapter slot 1.

Router(config-if)# interface ethernet 1/0
Router(config-if)# shutdown
Router(config-if)# interface ethernet 1/1
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco uBR7246 and Cisco uBR7246 VXR routers

interface, followed by the type (ethernet) and slot/port (port-adapter-slot-number/
interface-port-number)

The example is for interface 0 and interface 1 on a port adapter in port adapter slot 2.

Router(config-if)# interface ethernet 2/0
Router(config-if)# shutdown
Router(config-if)# interface ethernet 2/1
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco 7301 routers

interface, followed by the type (ethernet) and slot/port (port-adapter-slot number/ interface-port-number)

The example is for interface 0 and interface 1 on a port adapter in port adapter slot 1.

Router(config-if)# interface ethernet 1/0
Router(config-if)# shutdown
Router(config-if)# interface ethernet 1/1
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco 7304 PCI Port Adapter Carrier Card in a Cisco 7304 router

interface ethernet, followed by slot/port (module-slot-number/
interface-port-number)

The example is for interface 0 and interface 1 on a port adapter in a Cisco 7304 PCI Port Adapter Carrier Card in module slot 3 of a Cisco 7304 router.

Router(config-if)# interface ethernet 3/0 
Router(config-if)# shutdown
Router(config-if)# interface ethernet 3/1
Router(config-if)# shutdown
Ctrl-Z
Router#

Cisco 7401ASR routers

interface, followed by the type (ethernet) and slot/port (port-adapter-slot number/ interface-port-number)

The example is for interface 0 and interface 1 on a port adapter in port adapter slot 1.

Router(config-if)# interface ethernet 1/0
Router(config-if)# shutdown
Router(config-if)# interface ethernet 1/1
Router(config-if)# shutdown
Ctrl-Z
Router#

VIP in Cisco 7000 series or
Cisco 7500 series routers

interface, followed by the type (ethernet) and slot/port adapter/port (interface-processor-slot-number/
port-adapter-slot-number/
interface-port-number)

The example is for interface 0 on a port adapter in
port adapter slot 1 of a VIP installed in interface processor slot 1.

Router(config-if)# interface ethernet 1/1/1
Router(config-if)# shutdown
Router(config-if)# interface ethernet 1/1/0
Router(config-if)# shutdown
Ctrl-Z
Router#


Note If you need to shut down additional interfaces, enter the interface ethernet 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 (shut down) using the show interfaces command (followed by the interface type and interface address of the interface) to display the specific interface. Table 4-2 provides examples.

Table 4-2 Examples of the show interfaces Command 

Platform
Command
Example

Catalyst RSM/VIP2 in Catalyst 5000 family switches

show interfaces ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 1.

Router# show interfaces ethernet 1/0

Ethernet 1/0 is administratively down, 
line protocol is down

[Additional display text omitted from 
this example]

Cisco 7120 series routers

show interfaces ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 3.

Router# show interfaces ethernet 13/0

Ethernet 3/0 is administratively down, 
line protocol is down

[Additional display text omitted from 
this example]

Cisco 7140 series routers

show interfaces ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 4.

Router# show interfaces ethernet 4/0

Ethernet 4/0 is administratively down, 
line protocol is down

[Additional display text omitted from 
this example]

Cisco 7200 series routers

show interfaces ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 6.

Router# show interfaces ethernet 6/0

Ethernet 6/0 is administratively down, 
line protocol is down

[Additional display text omitted from 
this example]

Cisco uBR7223 router

show interfaces ethernet, followed by slot/port (port-adapter-slot- number/ interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 1.

Router# show interfaces ethernet 1/0

Ethernet 1/0 is administratively down, 
line protocol is down

[Additional display text omitted from 
this example]

Cisco uBR7246 and Cisco uBR7246 VXR routers

show interfaces ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 2.

Router# show interfaces ethernet 2/0

Ethernet 2/0 is administratively down, 
line protocol is down

[Additional display text omitted from 
this example]

Cisco 7301 routers

show interfaces ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 1.

Router# show interfaces ethernet 1/0

Ethernet 1/0 is administratively down, 
line protocol is down

[Additional display text omitted from 
this example]

Cisco 7304 PCI Port Adapter Carrier Card in a Cisco 7304 router

show interfaces ethernet, followed by slot/port (module-slot-number/
interface-port-number)

The example is for interface 0 on a port adapter in a Cisco 7304 PCI Port Adapter Carrier Card in module slot 3 of a Cisco 7304 router.

Router# show interfaces ethernet 3/0
 
Ethernet 3/0 is administratively down, 
line protocol is down 
 
[Additional display text omitted from 
this example]

Cisco 7401ASR routers

show interfaces ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 1.

Router# show interfaces ethernet 1/0

Ethernet 1/0 is administratively down, 
line protocol is down

[Additional display text omitted from 
this example]

VIP in Cisco 7000 series or Cisco 7500 series routers

show interfaces ethernet, followed by slot/port adapter/port (interface-processor-slot-number/ port-adapter-slot-number/ interface-port-number)

The example is for interface 0 on a port adapter in port adapter slot 1 of a VIP in interface processor slot 1.

Router# show interfaces ethernet 1/1/0

Ethernet 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 command followed by the interface type and interface address of the interface.

For complete descriptions of software configuration commands, refer to the publications listed in the "Related Documentation" section on page viii.


Performing a Basic Configuration

Following are instructions for a basic configuration: enabling an interface and specifying IP routing. 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 ethernet 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> 


Step 1 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 2 Specify the first interface to configure by entering the interface ethernet subcommand, followed by the interface address of the interface you plan to configure. Table 4-3 gives examples.

Table 4-3 Examples of the interface serial Subcommand 

Platform
Command
Example

Catalyst RSM/VIP2 in Catalyst 5000 family switches

interface ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 of a port adapter in port adapter slot 0.

Router(config)# interface ethernet 0/0
Router(config-if)#

Cisco 7120 series routers

interface ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 of a port adapter in port adapter slot 3.

Router(config)# interface ethernet 3/0
Router(config-if)#

Cisco 7140 series routers

interface ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 of a port adapter in port adapter slot 4.

Router(config)# interface ethernet 4/0
Router(config-if)#

Cisco 7200 series routers

interface ethernet, followed by slot/port (port-adapter-slot-number/
interface-port-number)

The example is for interface 0 of a port adapter in port adapter slot 6.

Router(config)# interface ethernet 6/0
Router(config-if)#

Cisco uBR7223 router

interface ethernet, followed by slot/port (port-adapter-slot-number/
interface-port-number)

The example is for interface 0 of a port adapter in port adapter slot 1.

Router(config)# interface ethernet 1/0
Router(config-if)#

Cisco uBR7246 and Cisco uBR7246 VXR routers

interface ethernet, followed by slot/port (port-adapter-slot-number/
interface-port-number)

The example is for interface 0 of a port adapter in port adapter slot 2.

Router(config)# interface ethernet 2/0
Router(config-if)#

Cisco 7301 routers

interface ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 of a port adapter in port adapter slot 1.

Router(config)# interface ethernet 1/0
Router(config-if)#

Cisco 7304 PCI Port Adapter Carrier Card in a Cisco 7304 router

interface ethernet, followed by slot/port (module-slot-number/
interface-port-number)

The example is for interface 0 on a port adapter in a Cisco 7304 PCI Port Adapter Carrier Card in module slot 3 of a Cisco 7304 router.

Router(config)# interface ethernet 3/0 
Router(config-if)# 

Cisco 7401ASR routers

interface ethernet, followed by slot/port (port-adapter-slot-number/ interface-port-number)

The example is for interface 0 of a port adapter in port adapter slot 1.

Router(config)# interface ethernet 1/0
Router(config-if)#

VIP in Cisco 7000 series or Cisco 7500 series routers

interface ethernet, followed by slot/port adapter/port (interface-processor-slot-number/
port-adapter-slot-number/
interface-port-number)

The example is for interface 0 of a port adapter in port adapter slot 1 of a VIP in interface processor slot 1.

Router(config)# interface ethernet 
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.

Step 5 Reenable the interfaces using the no shutdown command. (See the "Shutting Down an Interface" section.)

Step 6 Configure all additional port adapter interfaces as required.

Step 7 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 8 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.


Checking the Configuration

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:

Using show Commands to Verify the New Interface Status

Using the ping Command to Verify Network Connectivity

Using loopback Commands

Using show Commands to Verify the New Interface Status

Table 4-4 demonstrates how you can use the show commands to verify that new interfaces are configured and operating correctly and that the PA-4E 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 on page viii.


Note The outputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only.


Table 4-4 Using show Commands 

Command
Function
Example

show version or
show hardware

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

Note The slot argument is not required with Catalyst 5000 family switches.

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/
interface-port-number

Displays status information about a specific type of interface (for example, ethernet) on a Catalyst RSM/VIP2

Router# show interfaces ethernet 1/0

show interfaces type 3/interface-port-number

Displays status information about a specific type of interface, for example, ethernet) in a Cisco 7120 series router.

Router# show interfaces ethernet 3/1

show interfaces type 4/interface-port-number

Displays statue information about a specific type of interface (for example, ethernet) in a Cisco 7140 series router.

Router# show interfaces ethernet 4/1

show interfaces type 1/interface-port-number

Displays status information about a specific type of interface (for example, ethernet) in a Cisco uBR7223 router

Router# show interfaces ethernet 1/1

show interfaces type 1 or 2/
interface-port-number

Displays status information about a specific type of interface (for example, ethernet) in a Cisco uBR7246 or Cisco uBR7246 VXR router

Router# show interfaces ethernet 2/0

show interfaces type interface-processor-
slot
-number/port-adapter-slot-number/
interface-port-number

Displays status information about a specific type of interface (for example, ethernet) on a VIP in a Cisco 7000 series or Cisco 7500 series router

Router# show interfaces ethernet 
3/1/0

show interfaces type slot-number/interface-port-number

Displays status information about a specific type of interface (for example, ethernet) on a Cisco 7200 series router, Cisco 7301 router, or Cisco 7401ASR router

Router# show interfaces ethernet 1/0

show interfaces type 2 or 3 or 4 or 5/
interface-port-number

Displays status information about a serial interface on a Cisco 7304 PCI Port Adapter Carrier Card in a Cisco 7304 router

Router# show interfaces ethernet 3/0

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:

Using show version or show hardware Commands

Using the show diag Command

Using the show interfaces Command

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.

Using show version or show hardware 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. The following examples show output for the show version command on some of the platforms that support the PA-4E.


Note The outputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only.


Catalyst RSM/VIP2 in Catalyst 5000 Family Switches

Following is an example of the show version command from a Catalyst 5000 family switch with the PA-4E:

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 shj
Image text-base: 0x600108E0, data-base: 0x6095E000

ROM: System Bootstrap, Version 11.2(15707)
BOOTFLASH: C5RSM Software (C5RSM-JSV-M), Version 11.2

yosemite_3 uptime is 17 hours, 17 minutes
System restarted by reload
System image file is "dirt/yosemite/c5rsm-jsv-mz.7P", booted via tftp from 223.2
55.254.254

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).
1 VIP2 controller (4 Ethernet)(1 Fddi).
4 Ethernet/IEEE 802.3 interface(s)
15 Virtual Ethernet/IEEE 802.3 interface(s)
1 FDDI network interface(s)
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

Router#

Cisco 7100 Series Routers

Following is an example of the show version command from a Cisco 7120 series router with the PA-4E:

Router# show version
Cisco Internetwork Operating System Software 
IOS (tm) EGR Software (c7100-IS-M), Version 12.0(4)XE, EARLY DEPLOYMENT
RELEASE)
TAC:Home:SW:IOS:Specials for info
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Thu 10-Jun-99 15:32 by linda
Image text-base:0x60008900, data-base:0x60D8E000

ROM:System Bootstrap, Version 12.0(19990720:023243)
[gautham-conn_4xe-PRE_ALPHE
BOOTFLASH:EGR Software (c7100-IS-M), Version 12.0(4)XE, EARLY DEPLOYMENT
RELEA)

Router uptime is 24 minutes
System restarted by power-on
System image file is "disk0:c7100-is-mz.120-4.XE"

cisco 7120-bad (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
Bridging software.
X.25 software, Version 3.0.0.
4 Ethernet/IEEE 802.3 interface(s)
125K bytes of non-volatile configuration memory.

40960K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).
8192K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2000

Cisco 7200 Series and Cisco uBR7200 Series

Following is an example of the show version command from a Cisco 7200 series router with the PA-4E:

Router# show version

Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-J-M), Version 11.1(472) [biff 105]
Copyright (c) 1986-1996 by cisco Systems, Inc.
Compiled Sun 21-Apr-95 12:22 by
Image text-base: 0x600088A0, data-base: 0x605A4000

ROM: System Bootstrap, Version 11.1(10979) RELEASED SOFTWARE

Router uptime is 8 hours, 22 minutes
System restarted by reload
System image file is "slot0:c7200-j-mz.960421", booted via slot0

cisco 7200 (R4700) processor with 22528K/10240K bytes of memory.
R4700 processor, Implementation 33, Revision 1.0 (Level 2 Cache)
Last reset from power-on
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
Chassis Interface.
4 Ethernet/IEEE 802.3 interfaces.
5 FastEthernet/IEEE 802.3 interfaces.
125K bytes of non-volatile configuration memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
4096K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2

Cisco 7401ASR Routers

Following is an example of the show version command from a Cisco 7401ASR router with the PA-4E:

Router# show version

Cisco Internetwork Operating System Software
IOS (tm) 7401ASR Software (C7401ASR-J-M), Version 11.1(472) [biff 105]
Copyright (c) 1986-1996 by cisco Systems, Inc.
Compiled Sun 21-Apr-95 12:22 by
Image text-base: 0x600088A0, data-base: 0x605A4000

ROM: System Bootstrap, Version 11.1(10979) RELEASED SOFTWARE

Router uptime is 8 hours, 22 minutes
System restarted by reload
System image file is "slot0:c7200-j-mz.960421", booted via slot0

cisco 7401ASR (R4700) processor with 22528K/10240K bytes of memory.
R4700 processor, Implementation 33, Revision 1.0 (Level 2 Cache)
Last reset from power-on
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
Chassis Interface.
4 Ethernet/IEEE 802.3 interfaces.
5 FastEthernet/IEEE 802.3 interfaces.
125K bytes of non-volatile configuration memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
4096K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2

VIP in Cisco 7000 Series and Cisco 7500 Series Routers

Following is an example of the show version command from a Cisco 7500 series router with the PA-4E:

Router# show version

Cisco Internetwork Operating System Software
IOS (tm) GS Software (RSP-A), Version 11.1(471) [mpo 105]
Copyright (c) 1986-1995 by cisco Systems, Inc.
Compiled Fri 06-Oct-95 12:22 by mpo
Image text-base: 0x600088A0, data-base: 0x605A4000

ROM: System Bootstrap, Version 5.3(16645)
ROM: GS Bootstrap Software (RSP-BOOT-M), Version 11.1(1.2), MAINTENANCE INTERIME

honda uptime is 4 hours, 22 minutes
System restarted by reload
System image file is "slot0:rsp-a111-471", booted via slot0

cisco RSP2 (R4600) processor with 32768K bytes of memory.
R4600 processor, Implementation 32, Revision 2.0
Last reset from power-on
G.703/E1 software, Version 1.0.
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
Chassis Interface.
1 VIP2 controllers (4 Ethernet)(4 Serial).
4 Ethernet/IEEE 802.3 interfaces.
4 Serial network interfaces.
125K bytes of non-volatile configuration memory.

20480K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).
8192K bytes of Flash internal SIMM (Sector size 256K).
No slave installed in slot 6.
Configuration register is 0x2

Using the show diag Command

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 Cisco uBR7200 series router, Cisco 7301 router, and a Cisco 7401ASR router, and the interface processor slot in a Cisco 7000 series or Cisco 7500 series router with a VIP. The following examples show output for the show diag command on some of the platforms that support the PA-4E.


Note The outputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only.



Note The slot argument is not required for Catalyst 5000 family switches.


Catalyst RSM/VIP2 in Catalyst 5000 Family Switches

Following is an example of the show diag command that shows a PA-4E on 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 controler, 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

Cisco 7100 Series Router

Following is an example of the show diag slot command that shows a PA-4E in port adapter slot 3 of a cisco 7120 series router:

Router# show diag 3
Slot 3:
		 Ethernet port adapter, 4 ports
	 Integrated port adapter is analyzed 
        EEPROM contents at hardware discovery:
        Hardware revision 255.255               Board revision UNKNOWN
        EEPROM format version 1
        EEPROM contents (hex):
          0x20:01 D3 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

Note To use the show diag command with the Cisco 7140 series router, replace the slot argument 3 with 4.


Cisco 7200 Series and Cisco uBR7200 Series

Following is an example of the show diag slot command that shows a PA-4E in port adapter slot 1 of a Cisco 7200 series router:

Router# show diag 1
Slot 1:
Ethernet port adapter, 4 ports
Port adapter is analyzed
Port adapter insertion time 2d09h ago
Hardware revision 1.14          Board revision A0
Serial number     4294967295    Part number    73-1556-04
Test history      0x0           RMA number     00-00-00
EEPROM format version 1
EEPROM contents (hex):
0x20:01 02 01 0E FF FF FF FF 49 06 14 04 00 00 00 00
0x30:50 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FF

Note Port adapters used with Cisco 7200 VXR and Cisco uBR7246 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 chassis

Use the show diag command to display the hardware revision.


Cisco 7401ASR Routers

Following is an example of the show diag slot command that shows a PA-4E in port adapter slot 1 of a Cisco 7401ASR router:

Router# show diag 1
Slot 1:
Ethernet port adapter, 4 ports
Port adapter is analyzed
Port adapter insertion time 2d09h ago
Hardware revision 1.14          Board revision A0
Serial number     4294967295    Part number    73-1556-04
Test history      0x0           RMA number     00-00-00
EEPROM format version 1
EEPROM contents (hex):
0x20:01 02 01 0E FF FF FF FF 49 06 14 04 00 00 00 00
0x30:50 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FF

VIP in Cisco 7000 Series and Cisco 7500 Series Routers

Following is an example of the show diag slot command that shows a PA-4E in port adapter slot 11:

Router# show diag 11
Slot 11:
        Physical slot 11, ~physical slot 0x4, logical slot 11, CBus 0
        Microcode Status 0xC
        Master Enable, LED, WCS Loaded
        Board is analyzed
        Pending I/O Status: Console I/O
        EEPROM format version 1
        VIP2 controller, HW rev 2.2, board revision UNKNOWN
        Serial number: 03507967  Part number: 73-1684-02
        Test history: 0x00        RMA number: 00-00-00
        Flags: cisco 7000 board; 7500 compatible

        EEPROM contents (hex):
          0x20: 01 15 02 02 00 35 86 FF 49 06 94 02 00 00 00 00
          0x30: 12 2B 00 2A 1A 00 00 00 00 00 00 00 00 00 00 00

        Slot database information:
        Flags: 0x4      Insertion time: 0x3E50 (6d14h ago)

        Controller Memory Size: 8 MBytes

        PA Bay 1 Information:
                Ethernet PA, 4 ports
                EEPROM format version 1
                HW rev 1.0, Board revision 160
                Serial number: 02023164  Part number: 73-1556-03

Using the show interfaces Command

The show interfaces command displays status information (including the physical slot and interface address) for the interfaces you specify. All of the examples that follow specify ethernet interfaces.

For complete descriptions of interface subcommands and the configuration options available for Catalyst RSM/VIP2, Cisco 7100 series, Cisco 7200 series, Cisco uBR7200 series, Cisco 7301 routers, Cisco 7401ASR routers, and VIP interfaces, refer to the publications listed in the "Related Documentation" section on page viii. The following examples show output for the show interfaces command on some of the platforms that support the PA-4E.


Note The outputs that appear in this document may not match the output you receive when running these commands. The outputs in this document are examples only.


Catalyst RSM/VIP2 show interfaces Command

In these examples, the four ethernet interfaces (0 to 3) are on a port adapter in port adapter slot 0 of a Catalyst RSM/VIP2; also, most of the status information for each interface is omitted. (Interfaces are administratively shut down until you enable them.)

Router# show interfaces ethernet 0/0
Ethernet0/0 is administratively down, line protocol is down
  Hardware is cxBus Ethernet, address is 0000.0ca5.2300 (bia 0000.0ca5.2389)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 0/1
Ethernet0/1 is administratively down, line protocol is down
  Hardware is cxBus Ethernet, address is 0000.0ca5.2301 (bia 0000.0ca5.238a)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 0/2
Ethernet0/2 is administratively down, line protocol is down
  Hardware is cxBus Ethernet, address is 0000.0ca5.2302 (bia 0000.0ca5.238b)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 0/3
Ethernet0/3 is administratively down, line protocol is down
  Hardware is cxBus Ethernet, address is 0000.0ca5.2303 (bia 0000.0ca5.238c)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Cisco 7100 Series Routers

Following is an example of the show interfaces command used with a Cisco 7120 series router and a Cisco 7140 series router.

In this example the four ethernet interfaces (0 to 3) are on a port adapter in port adapter slot 3 of a Cisco 7120 series router; also, most of the status information for each interface is omitted. (Interfaces are administratively shut down until you enable them.)

Router# show interfaces ethernet 3/0
Ethernet3/0 is up, line protocol is up
	  Hardware is M8T-RS232
	  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 set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 3/1
Ethernet3/1 is up, line protocol is up
	  Hardware is M8T-RS232
	  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 set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 3/2
Ethernet3/2 is up, line protocol is up
  	Hardware is M8T-RS232
	  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 set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 3/3
Ethernet3/3 is up, line protocol is up
  	Hardware is M8T-RS232
	  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 set (10 sec)
[Additional display text omitted from this example]

Note To use the show interfaces ethernet command with the Cisco 7140 series router, replace the interface address arguments 3/0, 3/1, 3/2, and 3/3 with 4/0, 4/1, 4/2, and 4/3, respectively.


Following is an example of the show interfaces ethernet command, which shows all of the information specific to interface 0 on a PA-4E installed in port adapter slot 3 of a Cisco 7120 series router:

Router# show interfaces ethernet 3/0
Ethernet3/0 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

Note To use the show interfaces ethernet command with the Cisco 7140 series router, replace the interface address argument 3/0 with 4/0.


Cisco 7200 Series and Cisco uBR7200 Series show interfaces Command

Following is an example of the show interfaces command for Cisco 7200 series and Cisco uBR7200 series routers. In this example, the four Ethernet interfaces (0 to 3) are in port adapter slot 2; also, most of the status information for each interface is omitted. (Interfaces are administratively shut down until you enable them.)

Router# show interfaces ethernet 2/0
Ethernet2/0 is administratively down, line protocol is down
  Hardware is AmdP2 Ethernet, address is 10.0.0.10 (bia 0000.0ca5.2389)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 2/1
Ethernet2/1 is administratively down, line protocol is down
  Hardware is AmdP2 Ethernet, address is 10.0.0.11 (bia 0000.0ca5.238a)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 2/2
Ethernet2/2 is administratively down, line protocol is down
  Hardware is AmdP2 Ethernet, address is 10.0.0.12 (bia 0000.0ca5.238a)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 2/3
Ethernet2/3 is administratively down, line protocol is down
  Hardware is AmdP2 Ethernet, address is 10.0.0.13 (bia 0000.0ca5.238c)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Following is an example of the show interfaces ethernet command, which shows all of the information specific to the interface 0 on a port adapter in port adapter slot 2:

Router# show interfaces ethernet 2/0
Ethernet2/0 is administratively down, line protocol is down
  Hardware is AmdP2 Ethernet, address is 10.0.0.20 (bia 0000.0ca5.2388)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 4:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 2:56:26
  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
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets, 0 restarts
     0 output buffer failures, 0 output buffers swapped out

Cisco 7401ASR Routers

Following is an example of the show interfaces ethernet command, which shows all of the information specific to the interface 0 on a port adapter in port adapter slot 1:

Router# show interfaces ethernet 1/0
Ethernet1/0 is administratively down, line protocol is down
  Hardware is AmdP2 Ethernet, address is 10.0.0.20 (bia 0000.0ca5.2388)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 4:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 2:56:26
  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
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets, 0 restarts
     0 output buffer failures, 0 output buffers swapped out

VIP in Cisco 7000 Series or Cisco 7500 Series Routers

Following is an example of how the show interfaces command used with the VIP. In this example, the four Ethernet 10BaseT interfaces (0 to 3) are on a port adapter in port adapter slot 0 of a VIP in interface processor slot 3; also, most of the status information for each interface is omitted. (Interfaces are administratively shut down until you enable them.)

Router# show interfaces ethernet 3/0/0
Ethernet3/0/0 is administratively down, line protocol is down
  Hardware is cyBus Ethernet, address is 0000.0ca5.2300 (bia 0000.0ca5.2389)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 3/0/1
Ethernet3/0/1 is administratively down, line protocol is down
  Hardware is cyBus Ethernet, address is 0000.0ca5.2301 (bia 0000.0ca5.238a)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 3/0/2
Ethernet3/0/2 is administratively down, line protocol is down
  Hardware is cyBus Ethernet, address is 0000.0ca5.2302 (bia 0000.0ca5.238b)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Router# show interfaces ethernet 3/0/3
Ethernet3/0/3 is administratively down, line protocol is down
  Hardware is cyBus Ethernet, address is 0000.0ca5.2303 (bia 0000.0ca5.238c)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
[Additional display text omitted from this example]

Following is an example of the show interfaces ethernet command, which shows all of the information specific to interface  0 on a port adapter in port adapter slot 1 of a VIP2 in interface processor slot 3:

Router# show interfaces ethernet 3/1/0
Ethernet3/1/0 is administratively down, line protocol is down
  Hardware is cyBus Ethernet, address is 0000.0ca5.2304 (bia 0000.0ca5.2388)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
  Encapsulation ARPA, loopback not set, keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 4:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 2:56:26
  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
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets, 0 restarts
     0 output buffer failures, 0 output buffers swapped out

Proceed to the section "Using the ping Command to Verify Network Connectivity" to check network connectivity of the PA-4E and switch or router.

Using the ping Command to Verify Network Connectivity

The ping command allows you to verify that an interface port is functioning properly. This section provides brief descriptions of this command. Refer to the publications listed in the "Related Documentation" section on page viii 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] indicate 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.

Proceed to the next section, "Using loopback Commands" to finish checking network connectivity.

Using loopback Commands

With the loopback test, you can detect and isolate equipment malfunctions by testing the connection between the PA-4E interface and a remote device such as 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.

Depending on the mode of the port, issuing the loopback command checks the following path:

When no compact serial cable is attached to the PA-4E interface port, or if a DCE cable is attached to a port that is configured as line protocol up, the loopback command tests the path between the network processing engine and the interface port only (without leaving the network processing engine and port adapter).

When a DTE cable is attached to the port, the loopback command tests the path between the network processing engine and the near (network processing engine) side of the DSU or modem to test the PA-4E interface and compact serial cable.