PA-POS-OC3 Port Adapter Installation and Configuration
Configuring the PA-POS-OC3 Port Adapter
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Configuring the PA-POS-OC3

Table Of Contents

Configuring the PA-POS-OC3

Using the EXEC Command Interpreter

Configuring the Interfaces

Performing a Basic Configuration

Customizing the Configuration

Setting the MTU Size

Configuring Framing

Setting the Source of the Transmit Clock

Configuring Cyclic Redundancy Checks

Configuring SONET Payload Scrambling

Checking the Configuration

Using show Commands to Verify the New Interface Status

Using the 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 an Interface for Internal Loopback

Configuring an Interface for Line Loopback

PA-POS OC-3 Statistics Counters

PA-POS-OC3 Error Messages

Back-to-Back Connection


Configuring the PA-POS-OC3


To continue your Cisco PA-POS-OC3 port adapter installation, you must configure the OC-3 interface. The instructions that follow apply to all supported platforms. The instructions that follow apply to all supported platforms. Minor differences among the platforms—with Cisco IOS software commands—are noted. This chapter contains the following sections:

Using the EXEC Command Interpreter

Configuring the Interfaces

Checking the Configuration

Using loopback Commands

PA-POS OC-3 Statistics Counters

PA-POS-OC3 Error Messages

Back-to-Back Connection

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-POS-OC3 is installed correctly (the enabled LED goes on), use the privileged-level configure command to configure the new interface. Have the following information available:

IP address, if you plan to configure the interface for IP routing

MTU size

Framing mode

Transmit clock source

Loopback modes (if testing is required)

If you installed a new PA-POS-OC3 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-POS-OC3 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 the interface on a PA-POS-OC3, refer to the appropriate configuration 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.)

On power up, the OC-3 interface on a new PA-POS-OC3 is shut down. To enable the interface, you must enter the no shutdown command in configuration mode. When the OC-3 interface is enabled (taken out of shutdown) with no additional arguments, the default interface configuration file parameters are as listed in Table 4-1.

Table 4-1 PA-POS-OC3 Configuration Default Values

Parameter 1
Configuration Commands
Default Value

MTU

mtu bytes (no mtu bytes)

4470 bytes

Framing

pos framing-sdh (no pos framing-sdh)

SONET framing

Loopback internal

loop internal (no loop internal)

No internal loopback

Loopback line

loop line (no loop line)

No line loopback

Transmit clocking source

clock source internal
clock source line

Loop timing

Cyclic redundancy checks

crc 16
crc 32

crc 16

SONET payload scrambling

pos scramble-atm (no pos scramble-atm)

No scrambling

1 These default parameters apply to the PA-POS-OC3 in all supported platforms.



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.


Performing a Basic Configuration

This section describes the procedures for performing a basic configuration: enabling an interface (with the no shutdown command) 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.

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 will be 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 new interface to configure by entering the interface pos command, followed by the interface address of the interface you plan to configure. Table 4-2 gives examples.

Table 4-2 Examples of the interface pos Subcommand 

Platform
Command
Example

Catalyst RSM/VIP2 in Catalyst 5000 family switches

interface pos, followed by slot/0 or 1/0 (port-adapter-slot-number/
interface-port-number)

The example is for the OC-3 interface of a PA-POS-OC3 in port adapter slot 0.

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

Catalyst 6000 family FlexWAN module in Catalyst 6000 family switches

interface, followed by the type (pos) and mod_num/bay/port (module-slot-number/
port-adapter-bay-number/
interface-port-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 slot 3.

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

Cisco 7120 series routers

interface pos, followed by 3/0 (port-adapter-slot-number/
interface-port-number)

The example is for the OC-3 interface of a PA-POS-OC3 in port adapter slot 3.

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

Cisco 7140 series routers

interface pos, followed by 6/0 (port-adapter-slot-number/
interface-port-number)

The example is for the OC-3 interface of a PA-POS-OC3 in port adapter slot 6.

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

Cisco 7200 series routers1

interface pos, followed by slot/0 (port-adapter-slot-number/
interface-port-number)

The example is for the OC-3 interface of a PA-POS-OC3 in port adapter slot 6.

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

Cisco uBR7223 router

interface pos, followed by 1/0 (port-adapter-slot-number/
interface-port-number)

The example is for the OC-3 interface of a PA-POS-OC3 in port adapter slot 1.

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

Cisco uBR7246 and Cisco uBR7246 VXR routers

interface pos, followed by 1 or 2/0 (port-adapter-slot-number/
interface-port-number)

The example is for the OC-3 interface of a PA-POS-OC3 in port adapter slot 2.

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

Cisco 7301 router

interface pos, followed by 1/0 (port-adapter-slot-number/
interface-port-number)

The example is for the OC-3 interface of a PA-POS-OC3 in port adapter slot 1.

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

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

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

The example is for the OC-3 interface of a PA-POS-OC3 in a Cisco 7304 PCI Port Adapter Carrier Card in module slot 3 of a Cisco 7304 router.

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

Cisco 7401ASR router

interface pos, followed by 1/0 (port-adapter-slot-number/
interface-port-number)

The example is for the OC-3 interface of a PA-POS-OC3 in port adapter slot 1.

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

VIP in Cisco 7000 series or Cisco 7500 series routers

interface pos, followed by slot/0 or 1/0 (interface-processor-slot-number/
port-adapter-slot-number/
interface-port-number)

The example is for the OC-3 interface of a PA-POS-OC3 in port adapter slot 1 of a VIP in interface processor slot 1.

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

1 For the Cisco 7206VXR and Cisco 7206 router shelves, the interface specified in the above example would include a shelf number. For example, the command interface pos 5/3/0 specifies the OC-3 interface of the PA-POS-OC3 in port adapter slot 3 of router shelf 5.


Step 3 Assign an IP address and subnet mask to the interface (if IP routing is enabled on the system) with the ip address configuration subcommand, as in the following example:

Router(config-if)# ip address 10.0.0.10 255.255.255.255 

Step 4 Change the shutdown state to up and enable the interface as follows:

Router(config-if)# no shutdown

The no shutdown command passes an enable command to the interface and causes the PA-POS-OC3 to configure itself based on the previous configuration commands sent.

Step 5 Add any additional configuration subcommands required to enable routing protocols and adjust the interface characteristics.

Step 6 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 7 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.

Customizing the Configuration

You can change the default values of all configuration parameters to match your network environment. Use the interface subcommands in the following sections if you need to customize the PA-POS-OC3 configuration:

Setting the MTU Size

Configuring Framing

Setting the Source of the Transmit Clock

Configuring Cyclic Redundancy Checks

Configuring SONET Payload Scrambling


Note The interface subcommands that follow function the same regardless of the platform in which your PA-POS-OC3 is installed; however, all of these commands require that you first enter the interface pos command to select the interface that you want to configure.

In all of the configuration examples that follow, the interface address argument for the interface pos command is for a Cisco 7200 series router: 3/0 (port adapter slot 3, interface 0).

For the appropriate interface pos command syntax to use for your particular platform, see Table 4-2.


Setting the MTU Size

The default maximum transmission unit (MTU) size is 4470 bytes. To set the MTU size, enter the mtu bytes command, where bytes is a value in the range of 64 through 4470. (The value 4470 bytes exactly matches the MTU of FDDI and HSSI interfaces for autonomous switching.)

Router(config)# interface pos 3/0
Router(config-if)# mtu 3000

To restore the default of 4470 bytes, enter the no mtu command.

Configuring Framing

The default framing setting is SONET STS-3c. To configure for SDH STM-1, enter the pos framing-sdh command:

Router(config)# interface pos 3/0
Router(config-if)# pos framing-sdh

To change back to SONET STS-3c, enter the no pos framing-sdh command.

Setting the Source of the Transmit Clock

The clocking default specifies that the PA-POS-OC3 uses the recovered receive (RX) clock to provide transmit (TX) clocking (called loop timing). To specify that the PA-POS-OC3 generates the transmit clock internally, enter the clock source internal command:

Router(config)# interface pos 3/0
Router(config-if)# clock source internal

To restore loop timing, enter the no clock source internal command or the clock source line command.

Configuring Cyclic Redundancy Checks

The cyclic redundancy check (CRC) default is for a 16-bit CRC (CRC-CITT). The CRC is an error-checking technique that uses a calculated numeric value to detect errors in transmitted data. The PA-POS-OC3 also supports a 32-bit CRC. The sender of a data frame calculates the frame check sequence (FCS). The sender appends the FCS value to outgoing messages. The receiver recalculates the FCS and compares it to the FCS from the sender. If a difference exists, the receiver assumes that a transmission error occurred and sends a request to the sender to resend the frame. To configure an interface for a 32-bit CRC, enter the crc 32 command:

Router(config)# interface pos 3/0
Router(config-if)# crc 32

To disable the 32-bit CRC and return the interface to the default 16-bit CRC, enter the no crc 32 command.

Configuring SONET Payload Scrambling

The default is for SONET payload scrambling disabled. SONET payload scrambling applies a self-synchronous scrambler (x^43+1) to the Synchronous Payload Envelope (SPE) of the OC-3 interface to ensure sufficient bit-transition density.


Note Both ends of the connection must use the same scrambling algorithm.


You enable SONET payload scrambling using the pos scramble-atm command. (This command has no keywords or arguments.)

To enable SONET payload scrambling, use the following command sequence:

Router(config)# interface pos 3/0
Router(config-if)# pos scramble-atm
Router(config-if)# no shutdown
Router(config-if)# end

To verify that SONET payload scrambling is enabled on an interface, enter the show startup-config command. If scrambling is enabled, the following line is displayed in the configuration:

pos scramble-atm

To disable SONET payload scrambling, use the no pos scramble-atm command.

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 command 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 show Commands to Verify the New Interface Status

Table 4-3 demonstrates how you can use the show commands to verify that new interfaces are configured and operating correctly and that the PA-POS-OC3 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 4-3 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 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 pos 0 or 1/0

Displays status information about the OC-3 interface on a Catalyst RSM/VIP2

Router# show interfaces pos 0/0

show interfaces pos module-slot-
number/port-adapter-bay-number/
interface-port-number

Displays status information about the OC-3 interface on a Catalyst 6000 family FlexWAN module

Router# show interfaces pos 3/0/0

show interfaces pos port-adapter-slot-number/0

Displays status information about the OC-3 interface in a Cisco 7120 series router

Router# show interfaces pos 3/0

show interfaces pos port-adapter-slot-number/0

Displays status information about the OC-3 interface in a Cisco 7140 series router

Router# show interfaces pos 4/0

show interfaces pos port-adapter-slot-number/0

Displays status information about the OC-3 interface in a Cisco 7200 series router

Router# show interfaces pos 3/0

show interfaces pos 1/0

Displays status information about the OC-3 interface in a Cisco uBR7223 router

Router# show interfaces pos 1/0

show interfaces pos 1 or 2/0

Displays status information about the OC-3 interface in a Cisco uBR7246 or Cisco uBR7246 VXR router

Router# show interfaces pos 1/0

show interfaces pos 1/0

Displays status information about the OC-3 interface in a Cisco 7301 router

Router# show interfaces pos 1/0

show interfaces pos module-slot-number/
interface-port-number

Displays status information about the OC-3 interface on a Cisco 7304 PCI Port Adapter Carrier Card in a Cisco 7304 router

Router# show interfaces pos 3/0

show interfaces pos 1/0

Displays status information about the OC-3 interface in a Cisco 7401ASR router

Router# show interfaces pos 1/0

show interfaces pos interface-processor-
slot
-number/0 or 1/0

Displays status information about the OC-3 interface on a VIP in a Cisco 7000 series or Cisco 7500 series router

Router# show interfaces pos 3/0/0

show controllers

Displays all the current interface processors and their interfaces

Router# show controllers

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 the 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 the 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.


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-POS-OC3:

Router# show version

Cisco Internetwork Operating System Software
IOS (tm) C5RSM Software (C5RSM-JSV-M), Version 12.0(3)T
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.

[Additional display text omitted from this example]

1 VIP2 controller (1 POS).
1 Packet over SONET network interface(s)

[Additional display text omitted from this example]

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

Catalyst 6000 Family FLexWAN Module

Following is an example of the show version command for a Catalyst 6000 family FlexWAN module:

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)
2 HSSI network interface(s)
2 ATM network interface(s)
2 Packet over SONET network interface(s)
1 Channelized T3 port(s)
1 Channelized E3 port(s)
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

Cisco 7100 Series Routers

Following is an example of the show version command from a Cisco 7140 series router with the PA-POS-OC3:

Router# show version
Cisco Internetwork Operating System Software 
IOS (tm) EGR Software (C7100-JS56I-M), Version 12.1(4)E, 
Copyright (c) 1986-2000 by cisco Systems, Inc.
Compiled Tue 18-Jul-00 17:33 by leposo
Image text-base:0x60008950, data-base:0x61AB0000

ROM:System Bootstrap, Version 12.0(19991025:205336) 
[tkam-v120_5_xe_throttle_p23411 104] 
BOOTFLASH:EGR Software (C7100-BOOT-M), Version 12.0(5)XE2, EARLY DEPLOYMENT RELEASE 
SOFTWARE (fc1)

Router uptime is 24 minutes
System restarted by power-on
System image file is "disk0:c7100-is-mz.121-4.E"

cisco 7140-2MM3 (EGR) processor (revision A) with 253952K/73728K bytes of memory.
Processor board ID 15054452
R7000 CPU at 262Mhz, Implementation 39, Rev 1.0, 256KB L2, 2048KB L3 Cache
Last reset from power-on
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
TN3270 Emulation software.
Channelized E1, Version 1.0.
2 FastEthernet/IEEE 802.3 interface(s)
2 ATM network interface(s)
1 Packet over SONET network interface(s)
125K bytes of non-volatile configuration memory.

40960K bytes of ATA PCMCIA card at slot 1 (Sector size 512 bytes).
8192K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x0

Cisco 7200 Series and Cisco uBR7200 Series Routers

Following is an example of the show version command from a Cisco 7200 series router with the PA-POS-OC3:

Router# show version
Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-J-M), Version 11.1(21)CC [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 "c7401ASR-j-mz", booted via slot0
cisco 7401ASR 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.

[Additional display text omitted from this example]

1 Packet over SONET network interface(s)

[Additional display text omitted from this example]

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

Cisco 7301 Routers

Following is an example of the show version command from a Cisco 7301 router:

Router# show version
Cisco Internetwork Operating System Software 
IOS (tm) 7301 Software (C7300-JS-M), Experimental Version 12.2(20020904:004736) [biff 107]
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Mon 09-Sep-02 18:02 by biff
Image text-base:0x600088F8, data-base:0x61A94000

ROM:System Bootstrap, Version 12.2(20020730:200705) [biff-TAZ2_QA_RELEASE_16B 101], 
DEVELOPMENT SOFTWARE
BOOTLDR:7301 Software (C7301-BOOT-M), Experimental Version 12.2(20020813:014224) 
[biff-TAZ2_QA_RELEASE_17B 101]

7301p2b uptime is 0 minutes
System returned to ROM by reload at 00:01:51 UTC Sat Jan 1 2000
System image file is "tftp://10.1.8.11/tazii/images/c7301-js-mz"

cisco 7301 (NPE-G1) processor (revision A) with 491520K/32768K bytes of memory.
Processor board ID 0
BCM1250 CPU at 700Mhz, Implementation 1, Rev 0.2, 512KB L2 Cache
1 slot midplane, Version 2.0

Last reset from power-on
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
TN3270 Emulation software.
3 Gigabit Ethernet/IEEE 802.3 interface(s)
509K bytes of non-volatile configuration memory.
          
62976K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).
32768K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x102

Cisco 7401ASR Routers

Following is an example of the show version command from a Cisco 7401ASR router with the PA-POS-OC3:

Router# show version
Cisco Internetwork Operating System Software
IOS (tm) 7401ASR Software (C7401ASR-J-M), Version 11.1(21)CC [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 "c7401ASR-j-mz", booted via slot0
cisco 7401ASR 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.

[Additional display text omitted from this example]

1 Packet over SONET network interface(s)

[Additional display text omitted from this example]

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

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-POS-OC3:

Router# show version

Cisco Internetwork Operating System Software
IOS (tm) GS Software (RSP-A), Version 12.0(8)S [biff 125]
                      Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Wed 06-Oct-99 14:30 by biff
Image text-base: 0x600108A0, data-base: 0x60952000

ROM: System Bootstrap, Version 11.1(2) [biff], RELEASE SOFTWARE
BOOTFLASH:RSP Software (RSP-BOOT-M) 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.

[Additional display text omitted from this example]

1 VIP4 RM7000 controller (1 POS).
1 Packet over SONET network interface(s)

[Additional display text omitted from this example]

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

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 slot argument is not required for the PA-POS-OC3 installed on the Catalyst RSM-VIP2 in Catalyst 5000 family switches.)


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 diag command for a PA-POS-OC3 on a Catalyst RSM/VIP2:

Router# show diag 
Slot 3:
Physical slot 0, ~physical slot 0xF, logical slot 0, CBus 0
        Microcode Status 0x4
        Master Enable, LED, WCS Loaded
        Board is analyzed 
        Pending I/O Status: None
        EEPROM format version 1
        VIP2 R5K controller, HW rev 2.01, board revision B0
        Serial number: 06747824  Part number: 73-2167-03
        Test history: 0x00        RMA number: 00-00-00
        Flags: cisco 7000 board; 7500 compatible
 
        EEPROM contents (hex):
          0x20: 01 1E 02 01 00 66 F6 B0 49 08 77 03 00 00 00 00
          0x30: 58 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

        Slot database information:
        Flags: 0x4      Insertion time: 0x245C (00:06:51 ago)
 
        Controller Memory Size: 128 MBytes DRAM, 4096 KBytes SRAM
 
        PA Bay 0 Information:
                POS PA, 1 port, PA-POSSW-MM
                EEPROM format version 1
                HW rev 2.00, Board revision A0
                Serial number: 012345  Part number: 73-3192-02

Catalyst 6000 Family FlexWAN Module

Following is an example of the show diag command that shows a PA-POS-OC3 in port adapter bay 0 on a Catalyst 6000 family FlexWAN module in module slot 4:

Router# show diag 4
Slot 4: Logical_index 9
	Board is analyzed ipc ready FlexWAN controller

	Slot database information:
	Flags: 0x2004	Insertion time: unknown

	CWAN Controller Memory Size: Unknown

	PA Bay 1 Information:
		POS PA, 1 port
EEPROM format version 0
		HW rev 0.00, Board revision UNKNOWN
		Serial number: 00000000  Part number: 00-0000-00 

For complete command descriptions and examples for the Catalyst 6000 family FlexWAN module, refer to the publications listed in the "Related Documentation" section on page viii. Proceed to the "Using the ping Command to Verify Network Connectivity" section.

Cisco 7100 Series Routers

Following is an example of the show diag slot command for a PA-POS-OC3 in port adapter slot 4 of a Cisco 7140 series router:

Router# show diag 4
Slot 4:
POS Single Width, Multi Mode Port adapter, 1 port
Port adapter is analyzed 
Port adapter insertion time 00:03:16 ago
EEPROM contents at hardware discovery:
Hardware revision 2.0           Board revision A0
Serial number     11563673      Part number    73-3192-02
Test history      0x0           RMA number     00-00-00
EEPROM format version 1
EEPROM contents (hex):
0x20:01 96 02 00 00 B0 72 99 49 0C 78 02 00 00 00 00
0x30:50 00 00 00 99 01 14 00 00 00 FF FF FF FF FF FF

Note To use the show diag command with the Cisco 7120 series router, replace the slot argument 4 with 3.


Cisco 7200 Series and Cisco uBR7200 Series Routers

Following is an example of the show diag slot command for a PA-POS-OC3 in port adapter slot 3 of a Cisco 7200 series router:

Router# show diag 3
Slot 3:
        OC3-POS (multimode) port adapter, 1 port
        Port adapter is analyzed 
        Port adapter insertion time 00:09:13 ago
        Hardware revision 2.0           Board revision A0
        Serial number     012340       Part number    73-3192-02
        Test history      0x0           RMA number     00-00-00
        EEPROM format version 1
        EEPROM contents (hex):
          0x20: 01 96 02 00 00 92 71 38 49 0C 78 02 00 00 00 00
          0x30: 02 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FF

Cisco 7301 Routers


Note Input/output data for the console port, auxiliary port, Gigabit Ethernet ports, and CompactFlash Disk are listed in the output of the show c7300 command, rather than in the output of the show diag command. Use the show diag command for port adapter information.


Router# sh diag 

Slot 1:
        POS Single Width, Multi Mode Port adapter, 1 port 
        Port adapter is analyzed 
        Port adapter insertion time 01:38:29 ago 
        EEPROM contents at hardware discovery:
        Hardware revision 2.2           Board revision A0 
        Serial number     28672741      Part number    73-3192-06 
        FRU Part Number:PA-POS-OC3MM= 

        Test history      0x0           RMA number     00-00-00 
        EEPROM format version 1 
        EEPROM contents (hex):
          0x20:01 96 02 02 01 B5 82 E5 49 0C 78 06 00 00 00 00 
          0x30:50 00 00 00 02 08 19 00 00 00 FF FF FF FF FF FF 

Cisco 7401ASR Routers

Following is an example of the show diag slot command for a PA-POS-OC3 in port adapter slot 1of a Cisco 7401ASR router:

Router# show diag 1
Slot 3:
        OC3-POS (multimode) port adapter, 1 port
        Port adapter is analyzed 
        Port adapter insertion time 00:09:13 ago
        Hardware revision 2.0           Board revision A0
        Serial number     012340       Part number    73-3192-02
        Test history      0x0           RMA number     00-00-00
        EEPROM format version 1
        EEPROM contents (hex):
          0x20: 01 96 02 00 00 92 71 38 49 0C 78 02 00 00 00 00
          0x30: 02 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 for a PA-POS-OC3 in port adapter slot 0 of a VIP4 in interface processor slot 8:

Router# show diag 8
Slot 8:
        Physical slot 8, ~physical slot 0x7, logical slot 8, CBus 0
        Microcode Status 0x4
        Master Enable, LED, WCS Loaded
        Board is analyzed 
        Pending I/O Status:None
        EEPROM format version 2
        VIP4 RM7000 controller, HW rev 2.01, board revision A0
        Serial number:11500489  Part number:211-18700-71
        Test history:0x02        RMA number:00-00-00
        Flags: unknown flags 0x7F; 7500 compatible

        EEPROM contents (hex):
          0x20:02 22 02 01 00 AF 7B C9 D3 49 0C 47 02 00 00 00
          0x30:02 3A 0C FF FF FF FF FF FF FF FF FF FF FF FF FF

        Slot database information:
        Flags:0x4      Insertion time:0x3E39D4C (00:00:48 ago)

        Controller Memory Size:64 MBytes DRAM, 65536 KBytes SRAM

        PA Bay 0 Information:
                POS PA, 1 port, PA-POSSW-MM
                EEPROM format version 1
                HW rev 2.00, Board revision A0
                Serial number:123451  Part number:73-3192-02

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 POS interfaces.

For complete descriptions of interface subcommands and the configuration options available for interfaces on the Catalyst RSM/VIP2, Cisco 7100 routers, Cisco 7200 routers, Cisco uBR7200 series routers,Cisco 7301 routers, Cisco 7401ASR routers, and VIP, refer to the publications listed in the "Related Documentation" section on page viii.


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.


Catalyst RSM/VIP2 in Catalyst 5000 Family Switches

Following is an example of the show interfaces PA-POS-OC3 in port adapter slot 1 of a Catalyst RSM/VIP2:

Router# show interfaces pos 1/0
POS1/0 is administratively down, line protocol is down 
  Hardware is cyBus Packet over Sonet
  MTU 4470 bytes, BW 155000 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation HDLC, loopback not set, keepalive set (10 sec)
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  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 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 applique, 0 interface resets
     0 output buffers copied, 0 interrupts, 0 failures, 0 carrier transitions

Catalyst 6000 Family FlexWAN Module

Following is an example of the show interfaces command for a PA-POS-OC3 in port adapter bay 1 of a Catalyst 6000 family FlexWAN module in module slot 4:

Router# show interfaces pos 4/1/0
POS4/1/0 is up, line protocol is up 
  Hardware is Packet over Sonet
  MTU 4470 bytes, BW 155000 Kbit, DLY 100 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, crc 16, loopback not set
  Keepalive not set
  Scramble disabled
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  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 throttles
              0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     6 packets output, 1998 bytes, 0 underruns
     0 output errors, 0 applique, 1 interface resets
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions

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.


Cisco 7100 Series Routers

Following is an example of the show interfaces command for a PA-POS-OC3 in port adapter slot 4 of a Cisco 7140 series router:

Router# show interfaces pos 4/0
POS4/0 is up, line protocol is up 
Hardware is Packet over Sonet
Internet address is 1.1.1.2/8
MTU 4470 bytes, BW 155000 Kbit, DLY 100 usec, 
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive not set
Scramble disabled
Last input 00:00:16, output never, output hang never
Last clearing of "show interface" counters never
Queueing strategy:fifo
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
7 packets input, 1158 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 parity
10 input errors, 10 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
7 packets output, 1158 bytes, 0 underruns
0 output errors, 0 applique, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions

Note To use the show interfaces command with the Cisco 7120 series router, replace the slot argument 4 with 3.


Cisco 7200 Series and Cisco uBR7200 Series Routers

Following is an example of the show interfaces command for a PA-POS-OC3 in port adapter slot 3 of a Cisco 7200 series router:

Router# show interfaces pos 3/0
POS3/0 is administratively down, line protocol is down 
  Hardware is Packet over Sonet
  MTU 4470 bytes, BW 155000 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation HDLC, loopback not set, keepalive set (10 sec)
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  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 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     10 packets output, 234 bytes, 0 underruns
     0 output errors, 0 applique, 0 interface resets
     0 output buffers copied, 0 interrupts, 0 failures
     0 carrier transitions

Note For the Cisco 7206VXR and Cisco 7206 router shelves, the show interfaces pos command requires a shelf number in the format show interfaces pos shelf-number/port-adapter-slot-number/
interface-port. (For example the command show interfaces pos 5/3/0 specifies the OC-3 interface of a PA-POS-OC3 in port adapter slot 3 of router shelf 5.)


Cisco 7301 Router

Following is an example of the show interfaces command for Cisco 7301 routers. Most of the status information for each interface is omitted. (Interfaces are administratively shut down until you enable them.)

outer# show interfaces
GigabitEthernet0/0 is up, line protocol is up 
  Hardware is BCM1250 Internal MAC, address is 0005.dd2c.7c1b (bia 0005.dd2c.7c1b)
  Internet address is 10.1.3.153/16
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-duplex, 100Mb/s, media type is RJ45
  output flow-control is off, input flow-control is off
  ARP type:ARPA, ARP Timeout 04:00:00
  Last input 00:00:01, output 00:00:07, output hang never
  Last clearing of "show interface" counters 19:00:50
  Input queue:0/75/63658/0 (size/max/drops/flushes); Total output drops:0

(display text omitted)

GigabitEthernet0/1 is up, line protocol is up 
  Hardware is BCM1250 Internal MAC, address is 0005.dd2c.7c1a (bia 0005.dd2c.7c1a)
  Internet address is 192.18.1.1/24
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 5/255, rxload 6/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is autonegotiation, media type is SX
  output flow-control is off, input flow-control is off
  ARP type:ARPA, ARP Timeout 04:00:00
  Last input 18:56:46, output 00:00:09, output hang never
  Last clearing of "show interface" counters 19:00:52
  Input queue:0/75/16176489/0 (size/max/drops/flushes); Total output drops:0

(display text omitted)

GigabitEthernet0/2 is up, line protocol is up 
  Hardware is BCM1250 Internal MAC, address is 0005.dd2c.7c19 (bia 0005.dd2c.7c19)
  Internet address is 1.1.1.1/24
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 5/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is autonegotiation, media type is SX
  output flow-control is off, input flow-control is off
  ARP type:ARPA, ARP Timeout 04:00:00
  Last input 00:04:42, output 00:00:01, output hang never
  Last clearing of "show interface" counters 19:00:54
  Input queue:0/75/22087/0 (size/max/drops/flushes); Total output drops:0

(display text omitted)

Cisco 7401ASR Routers

Following is an example of the show interfaces command for a PA-POS-OC3 in port adapter slot 1of a Cisco 7401ASR router:

Router# show interfaces pos 1/0
POS1/0 is administratively down, line protocol is down 
  Hardware is Packet over Sonet
  MTU 4470 bytes, BW 155000 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation HDLC, loopback not set, keepalive set (10 sec)
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  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 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     10 packets output, 234 bytes, 0 underruns
     0 output errors, 0 applique, 0 interface resets
     0 output buffers copied, 0 interrupts, 0 failures
     0 carrier transitions

VIP in Cisco 7000 Series and Cisco 7500 Series Routers

Following is an example of the show interfaces command for PA-POS-OC3 in port adapter slot 0 of a VIP4 in interface processor slot 8 of a Cisco 7500 series router:

Router# show interfaces 8/0/0
POS8/0/0 is administratively down, line protocol is down 
  Hardware is cyBus Packet over Sonet
  MTU 4470 bytes, BW 155000 Kbit, DLY 100 usec, rely 255/255, load 1/255
  Encapsulation HDLC, crc 16, loopback not set
  Keepalive set (10 sec)
  Scramble disabled
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Queueing strategy:fifo
  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 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 applique, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

Proceed to the next section "Using the ping Command to Verify Network Connectivity," to check network connectivity between your network and the PA-POS-OC3 and router or switch.

Using the ping Command to Verify Network Connectivity

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 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.

Using loopback Commands

The loopback test allows you to troubleshoot, detect, and isolate equipment malfunctions by testing the connection between the OC-3 interface and a remote device. The loopback command places an interface in internal loopback (also called local loopback) or line loopback mode, which enables test packets that are generated from the ping command to loop through a remote device or a cable. If the packets complete the loop, the connection is good. If not, you can isolate a fault to the remote device or the cable in the path of the loopback test.

Configuring an Interface for Internal Loopback

The default loopback setting is for no loopback. With internal (or local) loopback, packets from the router are looped back in the framer. Outgoing data gets looped back to the receiver without actually being transmitted. Internal loopback is useful for checking that the PA-POS-OC3 is working. To configure an interface for internal loopback, enter the loop internal command:

Router(config)# interface pos 3/0
Router(config-if)# loop internal

To disable internal loopback, enter the no loop internal command.

Configuring an Interface for Line Loopback

The default loopback setting is for no loopback. With line loopback, the receive (RX) fiber is logically connected to the transmit (TX) optical fiber cable so that packets from the remote router are looped back to it. Incoming data gets looped around and retransmitted without actually being received. To configure an interface for line loopback, enter the loop line command:

Router(config)# interface pos 3/0
Router(config-if)# loop line

To disable line loopback, enter the no loop line command.

For complete descriptions of interface subcommands and the configuration options available for Cisco 7200, Cisco uBR7200 series, a Cisco 7401ASR router, and VIP interfaces, refer to the publications listed in the "Related Documentation" section on page viii.

PA-POS OC-3 Statistics Counters

The PA-POS-OC3 maintains counts of certain errors. Each error counter is 16 bits. Errors include the following:

CRC errors—Packet corrupted in reception

Giants received—Packet length too large (greater than 16 KB)

Runts—Packet length too small (less than or equal to 4 bytes)

Ignores—No receive buffers available; receive buffers full

PA-POS-OC3 Error Messages

The only error messages you should see are of the following type and format:

%POS-0-MSG:%DEBUGGER-0-STACK_DATA8: 00E0  FFFFFFFF 80057F50 00000000 00000000  FFFFFFFF 
80032CD4 00000000 00000000

Note Contact the Technical Assistance Center (TAC) for assistance with this error message. To contact the TAC, see the "Obtaining Technical Assistance" section on page xii.


Back-to-Back Connection

This section provides an example of two sample configuration files from two Cisco 7200 series routers or two Cisco 7000 series or Cisco 7500 series routers (with a VIP) connected back-to-back through their OC-3 interfaces.

First router:

interface POS 3/0 <for a PA-POS-OC3 in a Cisco 7200 series router>
interface POS 3/0/0 <for a PA-POS-OC-3 on a VIP2 or VIP4>
ip address 10.0.0.10
no keepalive
pos internal-clock

Second router:

interface POS 3/0 <for a PA-POS-OC3 in a Cisco 7200 series router>
interface POS 3/0/0 <for a PA-POS-OC3 on a VIP2 or VIP4>
ip address 10.0.0.20
no keepalive

To connect two PA-POS-OC3-equipped routers back to back, attach the appropriate cable between the OC-3 interface port on each PA-POS-OC3.

By default, the PA-POS-OC3 uses loop-timing mode. To specify that the PA-POS-OC3 generates the transmit clock internally, add the clock source  internal command to your configuration (see the first router example above: pos internal-clock).


Note For back-to-back operation, at least one of the OC-3 interfaces must be configured to supply its internal clock to the line.