Cisco IOS Software Releases 12.1 E

Table Of Contents

PA-POS-OC3 Packet OC-3 Port Adapter

Feature Overview

Benefits

Supported Platforms

Supported Standards, MIBs, and RFCs

Configuration Tasks

Configuration Examples

Command Reference

interface pos

pos ais-shut

PA-POS-OC3 Packet OC-3 Port Adapter

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This feature module describes the PA-POS-OC3 Packet OC-3 Port Adapter feature. It includes information on the benefits of the new feature, supported platforms, and configuration tasks.

This document includes the following sections:

•Feature Overview

•Supported Platforms

•Supported Standards, MIBs, and RFCs

•Configuration Tasks

•Configuration Examples

•Command Reference

Feature Overview

The Packet-Over-SONET OC3 port adapters (PA-POS-OC3SML, PA-POS-OC3SMI, and PA-POS-OC3MM) are available on Cisco 7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis Interface (RSP7000CI), Cisco 7100 series routers, Cisco 7200 series routers, and Cisco 7500 series routers.

The POS OC-3 provide a single 155.520-Mbps, OC-3 physical layer interface for packet-based traffic. This OC-3 interface is fully compatible with SONET and Synchronous Digital Hierarchy (SDH) network facilities and is compliant with RFC 1619, "PPP over SONET/SDH," and RFC 1662, "PPP in HDLC-like Framing." The Packet-Over-SONET specification is primarily concerned with the use of the PPP encapsulation over SONET/SDH links.

For more information on the PA-POS-OC3 port adapter, refer to the PA-POS-OC3 Port Adapter Installation and Configuration publication that accompanies the hardware.

Benefits

The POS-OC-3 port adapter provides the following benefits:

•Standards-compliant SONET/SDH interface; SONET/STS-3c and SDH/STM-1 framing and signaling overhead

•Full-duplex operation at 155 Mbps (half-duplex is not supported)

•Intermediate-reach (PA-POS-OC3-IR) and long-reach (PA-POS-OC3-LR) optical interface with single-mode fiber

•Short-reach optical interface (PA-POS-OC3MM) with multimode fiber

•Self-synchronous X^43+1 scrambling/descrambling of packets

•Online insertion and removal in Cisco 7100 and Cisco 7200 series routers

•Support for 16-bit and 32-bit cyclic redundancy checking

•Automatic Protection Switching (APS) of POS Circuits

•Frame Relay, HDLC, and PPP encapsulation

Supported Platforms

This feature is supported on these platforms:

•Cisco 7100 series routers, Cisco IOS Release 12.1(4)E

•Cisco 7200 series routers, Cisco IOS Release 11.1 CC and Release 12.0 T

•Cisco 7500 series routers, Cisco IOS Release 11.1 CC, Release 12.0, and Release 12.0 T

•Cisco 7000 series routers with the RSP7000 and RSP7000CI, Cisco IOS Release 11.1 CC, Release 12.0, and Release 12.0 T

Supported Standards, MIBs, and RFCs

Standards

No new or modified standards are supported by this feature.

MIBs

No new or modified MIBs are supported by this feature.

RFCs

No new or modified RFCs are supported by this feature

Configuration Tasks

For information on how to configure a POS interface, refer to the following publications:

•PA-POS-OC3 Packet OC-3 Port Adapter Installation and Configuration

•"Configuring Serial Interfaces" chapter in the Cisco IOS Interface Configuration Guide (Cisco IOS Release 12.0)

For information on other commands that can be used by the POS interface, refer to the Cisco IOS Release 12.0 configuration guides.

Configuration Examples

This section provides an example for configuring a POS interface located in slot 0, port adapter slot 0, port 0 in a Cisco 7500 series router:

Router# configure terminal

Router (config)# interface POS0/0/0

Router (config-if)# ip address 10.1.1.4 255.255.255.0

Router (config-if)# ip route-cache distributed

Router (config-if)# no keepalive

Router (config-if)# clock source internal

Router (config-if)# pos report rdool

Router (config-if)# pos report lais

Router (config-if)# pos report lrdi

Router (config-if)# pos report pais

Router (config-if)# pos report prdi

Router (config-if)# pos report sd-ber

Router (config-if)# no cdp enable

Router (config-if)# end

Router#

For additional examples of configuring a POS interface, refer to the following publications:

•PA-POS-OC-3 Packet OC-3 Port Adapter Installation and Configuration

•"Configuring Serial Interfaces" chapter in the Cisco IOS Interface Configuration Guide (Cisco IOS Release 12.0)

For more information on APS, refer to the following documents available on CCO:

•Automatic Protection Switching of Packet-over-Sonet Circuits feature module

"Configuring Serial Interfaces" chapter in the Cisco IOS Interface Configuration Guide (Cisco IOS Release 12.0)

Command Reference

This section documents new or modified commands. All commands used with this feature are documented in the following publications:

•Cisco IOS Release 12.0 command references

•PA-POS-OC-3 Packet OC-3 Port Adapter Installation and Configuration

interface pos

To specify the POS interface and enter interface configuration mode, use the interface pos global configuration command.

interface pos slot/port-adapter/port (on VIPs in Cisco 7000 series and Cisco 7500 series)
interface pos slot/port (on Cisco 7200 series)yntax Description

Syntax Description

slot	Specifies the backplane slot number.
port-adapter	On Cisco 7000 series and Cisco 7500 series routers, specifies the ports on a VIP card. The value must be 0.
port	Port number on the interface. The value must be 0.

Defaults

None

Command Modes

Global configuration

Command History

Release	Modification
11.2	This command was introduced.
11.2 P and 11.1 CA	This command was modified to change the interface posi command to interface pos.
11.1 CC	This command was modified to make the command description generic.
12.1(4)E	This command was supported on Cisco 7100 Series Routers.

Examples

The following example specifies the single Packet OC-3 interface on the POS OC-3 port adapter in slot 2:

interface pos 2/0

pos ais-shut

To send the line alarm indication signal (LAIS) when the POS interface is placed in any administrative shut down state, use the pos ais-shut command. In Automatic Protection Switching (APS) environments, LAIS can be used to force a protection switch. This command forces an APS switch when the interface is placed in administrative shut down state.

pos ais-shut

Syntax Description

This command has no keywords or arguments.

Defaults

No line alarm indication signal (LAIS) is sent.

Command Modes

Interface Configuration

Command History

Release	Modification
11.1 CC	This command was introduced.
12.1(4)E	This command was supported on Cisco 7100 Series Routers.

Examples

The following example forces the alarm indication on the POS OC-3 interface 0 in slot 3:

interface pos 3/0

 shutdown

 pos ais-shut