Cisco Systems 17053 appendix Appendix B Understanding How Autonegotiation Works

Page 25

 

 

 

manufacturer patches and

 

 

 

utility software are

 

 

 

installed.

 

 

 

 

Xircom XE2000

Does not

NIC only

Known limitation of

PCMCIA NIC

XE2000 NIC. Refer to

autonegotiate to 100

autonegotiates to 100

 

the XE2000 release

 

Mbps, full−duplex.

Mbps, half−duplex.

 

notes.

 

 

 

 

 

 

 

Appendix A: Information to Gather Before Creating a Service Request

If the troubleshooting procedure outlined in this document does not resolve your issue, you need to create a service request with Cisco Technical Support. Before you create a service request, gather this information:

1.Identify the specific problem with NIC−to−switch interoperability.

For example, is the problem only with DHCP, Novell IPX, login, or performance?

2.Issue the show tech−support command from all affected Cisco devices, if applicable; or, issue the show module, show config, show version, or the show port commands.

3.Know the make and model of the NIC.

4.Know the operating system and the NIC driver version.

5.Verify the consistency of the problem.

For example, does the problem occur across multiple Catalyst switches?

Appendix B: Understanding How Autonegotiation Works

Autonegotiation uses a modified version of the link integrity test that is used for 10BASE−T devices to negotiate speed and exchange other autonegotiation parameters. The original 10BASE−T link integrity test is referred to as Normal Link Pulse (NLP). The modified version of the link integrity test for 10/100 Mbps autonegotiation is referred to as FLP. The 10BASE−T devices expect a burst pulse every 16 (+/− 8) milliseconds (msec) as part of the link integrity test. FLP for 10/100 Mbps autonegotiation sends these bursts every 16 (+/− 8) msec with the additional pulses every 62.5 (+/− 7) microseconds. The pulses within the burst sequence generate code words that are used for compatibility exchanges between link partners. This process of FLP used in autonegotiation maintains backward compatibility with existing 10BASE−T connections, with the pulse burst every 16 (+/− 8) msec to comply with the link integrity test for normal 10BASE−T hardware. If a device sends FLP and only receives NLP, the hardware immediately ceases transmission of the FLP and enables the standard 10BASE−T hardware to continue 10BASE−T operation.

This table describes the possible programmable options of the control register for a FastEthernet interface. These options determine how the FastEthernet interface functions when connected to a link partner. The 0 in the Bits column refers to the programmable register address, and the decimal number after the 0 refers to the bit placement within the 16−bit register.

Table 12￿Physical Interface (PHY) Control Register Programmable Options

Bits

Name

0.15 Reset

Description

1 = PHY reset

0 = normal mode

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Contents Prerequisites IntroductionDocument ID RequirementsBackground Information General Troubleshooting for 10/100/1000 Mbps NICsAutonegotiation Valid Configuration Duplex Configuration2Mismatch Correct∙ show port modDport Verifying Physical Connection and LinkMaintaining Link Link Up/Down Situations Verifying Switch Port Configuration∙ show interfaces type ∙ Adjust switch jitter tolerance Understanding Data Link ErrorsPerformance Notes FCS Explanation of CatOS show port Command CountersPossible Causes for Incrementing CatOS Counters Explanation of CatOS show mac Command Counters Sniffer Trace Gigabit Autonegotiation Configuration Table Additional Troubleshooting for 1000BASE−X NICsTeaming of Network Interface Cards Gigabit Autonegotiation No Link to Connected DeviceCatalyst 8510 and 8540 CSR Catalyst 6000 and 6500 SwitchesSet port enable Catalyst 5000 and 5500 SwitchesCatalyst 4000, 2948G, and 2980G Switches Day to once a month. This issue can Catalyst 2950 and 3550 Switches NIC NIC Compatibility and Operation IssuesPage LnkChk to enable. 33921641.2241835 Hardware Panel SystemDevice ManagerPage R2BE/RBE/CBE Physical Interface PHY Control Register Programmable Options Appendix B Understanding How Autonegotiation Works= loopback mode switched on Related Information Networking Professionals Connection Featured Conversations

17053 specifications

Cisco Systems 17053 is a robust and versatile networking solution designed to meet the demands of modern data centers and enterprise environments. This device is part of Cisco's comprehensive portfolio of networking products, offering high performance, reliability, and scalability to help organizations enhance their connectivity and operational efficiency.

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In conclusion, the Cisco Systems 17053 is a feature-rich networking solution that combines advanced routing protocols, robust security measures, and exceptional scalability. With its ability to enhance network performance and offer comprehensive support, it stands out as a reliable choice for organizations looking to optimize their networking capabilities.
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