Setting the MTU Size | Cisco Systems PA-POS-1OC3, PA-POS-2OC3

Chapter 4 Configuring the PA-POS-1OC3

Customizing the Configuration

Setting the MTU Size

Note The default MTU size is 4470 bytes. The default value, 4470 bytes, exactly matches the maximum transmission unit (MTU) of the fiber distributed data interface (FDDI) and high-speed serial interface (HSSI) for autonomous switching.

Step 1 To set the MTU size, enter the mtu bytes command, where bytes is a value in the range of 64 to 117994.

Router(config)# interface pos 3/0

Router(config-if)# mtu 3000

Step 2 To restore the default of 4470 bytes, enter the no mtu command.

Router(config)# interface pos 3/0

Router(config-if)# no mtu 3000

Configuring Framing

The default framing setting is SONET STS-3c.

Step 1 To configure for SDH STM-1, enter the pos framing sdh command:

Router(config)# interface pos 3/0

Router(config-if)# pos framing sdh

Step 2 To change back to SONET STS-3c, enter the no pos framing sdh command.

Router(config)# interface pos 3/0

Router(config-if)# no pos framing sdh

Setting the Source of the Transmit Clock

The clocking default specifies that the PA-POS-1OC3 use the recovered receive (RX) clock to provide transmit (TX) clocking (called loop timing).

Note If line loopback is selected, the PA-POS-1OC3 is forced into loop timing mode until the loopback is disengaged.

Step 1 To specify that the PA-POS-1OC3 generate the transmit clock internally, enter the clock source internal command:

Router(config)# interface pos 3/0

Router(config-if)#clock source internal

PA-POS-1OC3 Single-Port Port Adapter Installation and Configuration Guide

	OL-6514-04	4-9

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Cisco Systems PA-POS-1OC3, PA-POS-2OC3 Setting the MTU Size, Configuring Framing, Setting the Source of the Transmit Clock

PA-POS-1OC3, PA-POS-2OC3 specifications

Cisco Systems has long been at the forefront of networking technology, providing solutions that empower organizations to enhance their connectivity and communication capabilities. Among its impressive lineup, the PA-POS-2OC3 and PA-POS-1OC3 modules stand out as significant components designed to optimize performance in service provider and enterprise environments.

The PA-POS-2OC3 and PA-POS-1OC3 modules are designed for use with the Cisco 7600 Series routers and are tailored for Packet Over SONET (POS) transport. Supporting the OC-3 speed of 155.52 Mbps, these modules provide reliable high-speed connectivity, enabling organizations to efficiently manage data traffic and ensure rapid data transfer across their networks. The PA-POS-2OC3 offers dual OC-3 capabilities, allowing for higher aggregate bandwidth and redundancy options, making it common in demanding network environments.

One of the main features of the PA-POS-2OC3 and PA-POS-1OC3 is their enhanced support for advanced networking protocols, including MPLS (Multiprotocol Label Switching). MPLS facilitates efficient data routing and improves bandwidth utilization by enabling multiple types of traffic to be consolidated over a single network. This is crucial for organizations looking to deploy services like VoIP, video conferencing, and other bandwidth-intensive applications.

The modules also offer robust error correction and monitoring capabilities, which are essential for maintaining service quality in mission-critical applications. Administrators can monitor performance and diagnose issues in real-time, enabling swift responses to potential concerns that could disrupt service.

Moreover, the PA-POS-2OC3 and PA-POS-1OC3 are designed with features that support enterprise-grade security and scalability. This is particularly beneficial for organizations expecting growth or requiring enhanced protection for sensitive data as it traverses the network.

In summary, Cisco's PA-POS-2OC3 and PA-POS-1OC3 modules represent essential building blocks for high-speed networking solutions. Their support for OC-3 connectivity, advanced routing protocols, and robust monitoring capabilities make them ideal for both service providers and enterprises. Through increased scalability, improved bandwidth management, and enhanced security, these modules allow organizations to adapt to the ever-evolving landscape of data communications effectively. With Cisco at the helm, businesses can trust in a networking solution that not only meets current demands but is also primed for future growth.

Contents

Text Part Number OL-6514-04 Americas Headquarters Copyright 2007 Cisco Systems, Inc. All rights reserved N T E N T S Cisco 7401ASR Router Cisco 7401ASR Router-Removing and Installing a Port Adapter OL-6514-03 Objectives Document Version HistoryVersion Date Related Documentation OrganizationSection Title Description Preface Related Documentation OL-6514-04 PA-POS-1OC3 Overview PA-POS-1OC3 Overview SDH Equivalent SONET/SDH Overview Features OC-3 Optical Fiber Specifications Interface Specifications Network Management Support LEDs Using Statistics to Estimate Link Loss and Power BudgetEncapsulation Method Support LED Label Color State Function RCV Cables and Connectors Cisco 7200 VXR Routers Slot Numbering Port Adapter Slot Locations on the Supported Platforms Cisco 7200 Series VXR Cisco 7201 Router Slot Numbering Cisco 7304 PCI Port Adapter Carrier Card Slot Numbering Cisco 7301 Router Slot Numbering Module Slots on the Cisco 7304 Router Cisco 7401ASR Router Slot Numbering 10 VIP Slot Locations Cisco 7500 Series Routers with VIP Slot Numbering RSP Cisco 7505 Router Slot Numbering VIP interface-slot RSP-slot Cisco 7507 Router Slot Numbering 6 8 10 Cisco 7513 Router Slot Numbering SUPERVISOR2 Cisco 7603 Router Slot Numbering Cisco 7606 Router Slot Numbering FAN Status Cisco 7609 Router Slot Numbering Cisco 7613 Router Slot Numbering Platform Interface Address Format Numbers Syntax Identifying Interface Addresses Cisco 7201 Router Interface Addresses Cisco 7200 VXR Routers Interface AddressesCisco 7301 Router Interface Addresses Cisco 7500 Series Routers VIP Interface Addresses Cisco 7401ASR Router Interface Addresses Cisco 7600 Series Routers FlexWAN Module Interface Addresses OL-6514-04 Required Tools and Equipment Preparing for Installation Cisco 7200 VXR Routers Software and Hardware RequirementsPlatform Recommended Minimum Cisco IOS Release Checking Hardware and Software Compatibility Safety Warnings Safety Guidelines Avvertenza Importanti Istruzioni Sulla Sicurezza Warnung Wichtige SicherheitshinweiseAviso Instruções Importantes DE Segurança Guarde Estas Instrucciones GEM Disse Anvisninger OL-6514-04 Electrical Equipment Guidelines Preventing Electrostatic Discharge Damage Telephone Wiring Guidelines FCC Class a Compliance Laser Safety OL-6514-04 Handling Port Adapters Removing and Installing the PA-POS-1OC3 Handling a Port Adapter Online Insertion and Removal OIR Functional Description Port Adapter Removal and Installation Step Cisco Cisco 7201 Router-Removing and Installing a Port Adapter Cisco 7301 Router-Removing and Installing a Port Adapter OL-6514-04 CC-PA Cisco 7401ASR Router-Removing and Installing a Port Adapter With the screw removed, grasp Screw TX RX Connecting PA-POS-1OC3 Interface Cables Handling the SFP Optics Module Replacing the SFP Optics ModuleRemoving the SFP Optics Module Installing the SFP Optics Module Inserting an SFP Optics Module Verifying the SFP Optics Module InstallationPage OL-6514-04 Using the Exec Command Interpreter Configuring the PA-POS-1OC3 Parameter Configuration Commands Default Value Configuring the Interfaces Shutting Down an Interface Platform Command Example Slot/port-adapter/port Show interfaces pos, followed by Show interfaces pos followed by Performing a Basic Configuration Interface pos, followed by Customizing the Configuration Configuring Framing Setting the MTU SizeSetting the Source of the Transmit Clock Configuring Sonet Payload Scrambling Configuring Cyclic Redundancy Checks Basic APS Configuration Configuring APS Using show Commands to Verify the New Interface Status Checking the ConfigurationCommand Function Example Show controllers Using the show version or show hardware Commands Cisco 7201 Router-Example Output of the show version Command Router#show version Port adapter is analyzed Using the show diag Command Cisco 7201 Router-Example Output of the show diag Command Router#show diag Router# show interfaces pos 4/0 PE3#sh int pos4/1 Using the show interfaces Command Router# show interfaces Router# ping 10.0.0.10 Return Using the ping Command to Verify Network Connectivity Configuring an Interface for Internal Loopback Using loopback CommandsConfiguring an Interface for Line Loopback Push Mode Description PA-POS-1OC3 Statistics Counters PA-POS-1OC3 Error MessagesMaking a Back-to-Back Connection First router Configuring the PA-POS-1OC3 Making a Back-to-Back Connection