Cisco 10000 Series Router Line Card Configuration Guide
1-Port OC-48/STM-16 Packet over SONET Line Card Configuration
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Table Of Contents

1-Port OC-48/STM-16 Packet over SONET Line Card Configuration

Software Support

Checking Hardware and Software Compatibility

Default Values

SDCC Default Values

Interface Syntax

Configuring the Interface

MAC Protocol Selection Command

Interface Configuration Mode Command

SDCC Interface Configuration Commands

Enabling the SDCC Interface Configuration Mode

Enabling an SDCC Interface

Interface Selection Command

Enabling Loopback Tests

Configuring CRC Size

Configuring MTU Size

Configuring Hold Queue Size

Other Configuration Commands

Setting the Clock Source

Configuring Framing

Configuring SONET Overhead

Configuring Packet over SONET SPE Scrambling

Configuring Loopback Testing


1-Port OC-48/STM-16 Packet over SONET Line Card Configuration

This chapter describes procedures for configuring the Cisco 10000 series 1-Port OC-48/STM-16 Packet over SONET line card, hereafter known as the 1-Port OC-48/STM-16 Packet over SONET line card.

The 1-Port OC-48/STM-16 Packet over SONET line card provides a trunk uplink capable of supporting up to 2.4 Gbps full duplex throughput over a standard SONET/ITU-T Synchronous Digital Hierarchy (SDH) interface, using a single-mode fiber with SC connectors.

This chapter contains the following sections:

•Software Support

•Default Values

•SDCC Default Values

•Interface Syntax

•Configuring the Interface

•MAC Protocol Selection Command

•Interface Configuration Mode Command

•SDCC Interface Configuration Commands

•Other Configuration Commands

Software Support

Table 14-1 shows the minimum Cisco IOS release on each release train that supports the 1-Port OC-48/STM-16 Packet over SONET line card.

Table 14-1 1-Port OC-48/STM-16 Packet over SONET Line Card Software Support 

Required PRE
Minimum Cisco IOS Releases

PRE2

Cisco IOS Release 12.2(15)BX and later releases of Cisco IOS 12.2BX
Cisco Release IOS 12.3(7)XI and later releases of Cisco IOS 12.3XI
Cisco IOS Release 12.2(28)SB and later releases of Cisco IOS 12.2SB


Checking Hardware and Software Compatibility

The PRE installed in the Cisco 10000 series router chassis must support the Cisco IOS software running on the router. Use the show version command to check the PRE version installed.

To see if a feature is supported by a Cisco IOS release, to locate the software document for that feature, or to check the minimum software requirements of Cisco IOS software with the hardware installed on your router, Cisco maintains the Software Advisor tool on Cisco.com at http://www.cisco.com/pcgi-bin/Support/CompNav/Index.pl

This tool does not verify whether line cards within a system are compatible, but does provide the minimum Cisco IOS requirements for individual hardware line cards, modules, or options.

You must be a registered user on Cisco.com to access this tool.

Default Values

Table 14-2 lists default values for the 1-Port OC-48/STM-16 Packet over SONET line card. This table also includes the command used for modifying a default value and indicates whether a value needs to be the same (or opposite) on the remote end of the connection.

Table 14-2 1-Port OC-48/STM-16 Packet over SONET Line Card SONET Defaults 

Command Name
Default Setting
Command Syntax
Remote Side Setting

bandwidth

2488 

bandwidth kilobits

Same

clock source

line 

clock source [line | internal]

At least one side must be set to internal.

crc

32 

crc [16 | 32]

Same

encapsulation

HDLC 

encapsulation [hdlc | ppp | frame-relay]

Same

keepalive

10 

[no] keepalive period

Same

mtu (maximum transmission unit)

4470 

mtu size

Same

MAC Protocol

pos 

hw-module slot [pos]

Same

pos framing

SONET 

pos framing [sonet | sdh]

Same

pos scramble-atm

No scrambling 

[no] pos scramble-atm

Same

pos flag (SONET overhead)

c2 to 0xcf
j0 to 0x01
s1s0 to 0 

pos flag [c2 | j0 | s1s0] value

Same


SDCC Default Values

Table 14-3 lists default values for the 1-Port OC-48/STM-16 Packet over SONET line card if you configure a SONET Section Data Communications Channel (SDCC) interface.

The table includes the command used for modifying a default value and indicates whether a value needs to be the same (or opposite) on the remote end of the connection.

Table 14-3 1-Port OC-48/STM-16 Packet over SONET Line Card SONET SDCC Defaults 

Command Name
Default Setting
Command Syntax
Remote Side Setting

bandwidth

192 

bandwidth kilobits

Same

crc

32 

crc [16 | 32]

Same

keepalive

10 

[no] keepalive period

Same

mtu (maximum transmission unit)

1500 

mtu size

Same

loopback (internal)

off 

[no] loopback

N/A


Interface Syntax

Use the syntax in Table 14-4 to specify an 1-Port OC-48/STM-16 Packet over SONET line card interface number in a configuration command.

Table 14-4 OC-48 Interface Syntax

Type of Interface
Slot
Subslot
Port

Packet over SONET interface

1 to 8/

0/

0


The following example shows the syntax for an OC-48 card in slot 1: 

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

Router(config-if)#

Configuring the Interface

After verifying that the 1-Port OC-48/STM-16 Packet over SONET line card is installed correctly, use the following procedure to configure the interface and specify an IP address. Be prepared with the information you will need, such as the IP address.

Step 1 Specify the MAC protocol using the hw-module slot command. In this example, the controller is configured for Packet over SONET: 

Router(config)# hw-module slot 2 pos

Step 2 At the global configuration prompt, enter interface configuration mode. In this example, the interface configuration mode is Packet Over SONET (POS): 

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

Step 3 Assign an IP address and a subnet mask to the interface using the ip address command. For example: 

Router(config-if)# ip address 192.168.21.1 255.255.255.0

Step 4 Specify either HDLC or PPP encapsulation. The following example specifies HDLC encapsulation: 

Router(config-if)# encapsulation hdlc

Step 5 If necessary, modify the 1-Port OC-48/STM-16 Packet over SONET line card configuration or the configuration of the remote device to ensure that they use the same settings, where appropriate. For more information, refer to the Remote Side Setting column in Table 14-2.

Step 6 Add any other configuration commands required to enable routing protocols and adjust the interface characteristics.

Step 7 Enter the no shutdown command to enable the interface. For example: 

Router(config-if)# no shutdown

Step 8 When you have included all of the configuration commands to complete the configuration, enter Ctrl-Z to exit configuration mode.

Step 9 Write the new configuration to memory. 

Router# copy running-config startup-config

The system displays an OK message when the configuration has been stored.

After you have completed the configuration, you can verify that it is correct using the show interface pos slot/subslot/port command.

MAC Protocol Selection Command

You must specify the MAC protocol that the 1-Port OC-48/STM-16 Packet over SONET line card will use before you configure the interface, by using the following command: 

hw-module slot slot [pos]

Where slot is 1 to 8.

The following example shows how you specify the Packet over SONET MAC protocol for a card in slot 2: 

Router(config)# hw-module slot 2 pos

Interface Configuration Mode Command

To configure an interface, you must specify an interface configuration mode by using the following command: 

interface [pos | sdcc] slot/subslot/port

Where slot is 1 to 8, subslot is 0, and port is 0.

The following example shows how you specify Packet over SONET interface configuration mode for a card in slot 2: 

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

Router(config-if)#

SDCC Interface Configuration Commands

This section lists the commands that are available when you configure a SONET Section Data Communications Channel (SDCC) interface on the router.

Note The SDCC interface is available only after the MAC protocol has been set to Packet over SONET. For more information about setting the MAC protocol, see the MAC Protocol Selection Command

Enabling the SDCC Interface Configuration Mode

You must first enable the SDCC interface configuration mode before attempting to configure any SDCC commands. You can enable the SDCC interface mode from global configuration mode by using the sdcc enable command. 

sdcc enable

[no] sdcc enable

The default setting is disabled.

In the following example, SDCC is enabled:

Router(config)# sdcc enable

Caution If you enter the no sdcc enable command after configuring an SDCC interface, the interface is removed from the interface list in the configuration.

Enabling an SDCC Interface

You can administratively enable an SDCC interface using the no shutdown command. 

shutdown

[no] shutdown

The default state of an SDCC interface is administratively up.

In the following example, an SDCC interface is enabled:

Router(config)# no shutdown

Interface Selection Command

To configure an SDCC interface, you must select an interface using the interface command: 

interface sdcc slot/subslot/port

Where slot is 1 to 8, subslot is 0, and port is 0.

The following example shows how you specify an SDCC interface for a card in slot 2: 

Router(config)# interface sdcc 2/0/0

Router(config-if)#

Enabling Loopback Tests

You can configure an SDCC interface for an internal loopback test by using the loopback command. With an internal loopback, packets that are received by the line card from the route processor are looped back to the route processor without being sent to the line. 

loopback

[no] loopback

Use the no form of the command to stop the loopback test.

The default is none.

In the following example, the loopback is set to line: 

Router(config-if)# loopback

Configuring CRC Size

You can configure the CRC size for HDLC encapsulation on an SDCC interface to 16- and 32-bit CRCs using the crc command. 

crc {16 | 32}

Where:

16 sets the CRC to 16 bits.

32 sets the CRC to 32 bits.

The default is 32.

In the following example, the CRC size is set to 16: 

Router(config-if)# crc 16

Configuring MTU Size

You can configure the Maximum Transmission Unit (MTU) size for up to 1500 bytes, using the mtu command.

Note The MTU size does not include the 4 bytes for the HDLC header, or the 2 or 4 bytes of the CRC.

mtu mtu bytes

Where mtu bytes is the MTU size from zero to 1500.

The default is 1500.

In the following example, the MTU size is set to 1000: 

Router(config-if)# mtu 1000

Configuring Hold Queue Size

You can configure a hold queue on an SDCC interface for packets received from the line using the hold-queue command. 

hold-queue number in

Where number is the maximum number of packets that the line card will hold in the hold queue, from zero to 4096.

The default hold queue size is 75 packets.

In the following example, the hold queue size is set to 60 packets: 

Router(config-if)# hold-queue 60 in

Other Configuration Commands

The following sections present some of the commands that you can use to customize the 1-Port OC-48/STM-16 Packet over SONET line card configuration.

Setting the Clock Source

You can set the clock source to internal or line by using the clock source command. 

clock source {internal | line}

Where:

•internal specifies that the internal clock source is used

•line specifies that the network clock source is used

The default is clock source internal.

In this example, the clock source is set to line: 

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

Router(config-if)# clock source line

Configuring Framing

You can use the pos framing command to set framing to SONET STS-3c or SDH STM-1 framing. 

pos framing [sdh | sonet]

[no] pos framing

The default is SONET.

Make sure your system supports SDH before using this option.

Use the no form of the command to restore the default framing mode.

In the following example, the framing type is set to SONET: 

Router(config)# interface pos 5/0/0

Router(config-if)# no pos framing

Configuring SONET Overhead

You can use the pos flag command to assign values for specific elements of the frame header. This command is typically used to meet a standards requirement or to ensure interoperability with another vendor's equipment. 

pos flag [c2 value] [j0 value] [s1s0 value]

[no] pos flag [c2 value] [j0 value] [s1s0 value]

Where:

•c2 is a path signal identifier, and value is one of the following:

–0xCF for PPP or HDLC without scrambling

–0x16 for PPP or HDLC with scrambling

•j0 is the section trace byte, and value is 0x1 for interoperability with SDH devices.

•s1s0 is part of the payload pointer byte, value is 0 for OC-48c and 2 for AU-4.

The default values are c2—0xCF, j0—0x01, and s1s0—0.

Use the no form of the command to restore the default values.

In the following example, the c2 bit is set to 0xCF: 

Router(config)# interface pos 5/0/0

Router(config-if)# pos flag c2 0xCF

Configuring Packet over SONET SPE Scrambling

You can set the 1-Port OC-48/STM-16 Packet over SONET line card to scramble the Packet over SONET synchronous payload envelope (SPE) using the pos scramble-atm command. SONET payload scrambling applies a self-synchronous scrambler to the SPE of the interface to ensure sufficient bit transition density. 

pos scramble-atm

[no] pos scramble-atm

The default is no Packet over SONET SPE scrambling.

Use the no form of the command to disable scrambling.

In the following example, scrambling is enabled: 

Router(config)# interface pos 5/0/0

Router(config-if)# pos scramble-atm

Configuring Loopback Testing

You can enable loopback testing of data transmitted from the PRE to the OC-48 line card and back, by using the loopback command in interface configuration mode. 

loopback [line | internal]

[no] loopback [line | internal]

Where:

internal loops packets received from the route processor back into the line card to the route processor without being sent to the line.

line loops packets received from the line back onto the line at the line card level without being processed in the Route Processor.

Use the no form of the command to stop the loopback test.

For more information on loopbacks, refer to the online Cisco 10000 Series Internet Router Troubleshooting Guide.

In the following example, a loopback is set for the 1-Port OC-48/STM-16 Packet over SONET line card in slot 5: 

Router(config)# interface pos 5/0/0

Router(config-if)# loopback line