Cisco Systems IC-23 Enabling a Hub Port, Disabling or Enabling the Link Test Function, IC-45

Page 23

Configuring LAN Interfaces

Configuring a Hub Interface

Enabling a Hub Port

To enable a hub port, use the following commands in global configuration mode:

 

Command

Purpose

Step 1

 

 

hub ethernet number port [end-port]

Specifies the hub number and the hub port (or range of hub ports) and

 

 

enters hub configuration mode.

Step 2

 

 

no shutdown

Enables the hub ports.

 

 

 

Disabling or Enabling Automatic Receiver Polarity Reversal

 

On Ethernet hub ports only, the hub ports can invert, or correct, the polarity of the received data if the

 

port detects that the received data packet waveform polarity is reversed due to a wiring error. This receive

 

circuitry polarity correction allows the hub to repeat subsequent packets with correct polarity. When

 

enabled, this function is executed once after reset of a link fail state.

 

Automatic receiver polarity reversal is enabled by default. To disable this feature on a per-port basis, use

 

the following command in hub configuration mode:

 

 

 

Command

 

Purpose

 

 

 

no auto-polarity

 

Disables automatic receiver polarity reversal.

 

 

 

 

To enable automatic receiver polarity reversal on a per-port basis, use the following command in hub

 

configuration mode:

Command

auto-polarity

Purpose

Enables automatic receiver polarity reversal.

Disabling or Enabling the Link Test Function

The link test function applies to Ethernet hub ports only. The Ethernet ports implement the link test function as specified in the 802.3 10BASE-T standard. The hub ports will transmit link test pulses to any attached twisted pair device if the port has been inactive for more than 8 to 17 ms.

If a hub port does not receive any data packets or link test pulses for more than 65 to 132 ms and the link test function is enabled for that port, that port enters link fail state and cannot transmit or receive. The hub port is enabled again when it receives four consecutive link test pulses or a data packet.

The link test function is enabled by default. To allow the hub to interoperate with 10BASE-T twisted-pair networks that do not implement the link test function, the hub’s link test receive function can be disabled on a per-port basis. To do so, use the following command in hub configuration mode:

Command

no link-test

Purpose

Disables the link test function.

Cisco IOS Interface Configuration Guide

IC-45

Image 23
Contents IC-23 Configuring an Ethernet or Fast Ethernet InterfaceIC-24 Ethernet and Fast Ethernet Interface Configuration Task ListIC-25 Specifying an Ethernet or Fast Ethernet InterfaceSpecifying an Ethernet Encapsulation Method IC-26 Specifying the Media and Connector TypeSpecifying Full-Duplex Operation IC-27 Configuring Fast Ethernet 100BASE-TExtending the 10BASE-T Capability IC-28 Configuring PA-12E/2FE Port AdapterIC-29 Configuring the PA-12E/2FE Port AdapterIC-30 IC-31 Monitoring and Maintaining the PA-12E/2FE Port AdapterIC-32 IC-33 Configuring Fast EtherChannelConfiguring the 100VG-AnyLAN Port Adapter IC-34 Fast EtherChannel Configuration Task ListIC-35 Configuring the Port-Channel InterfaceIC-36 Configuring the Fast Ethernet InterfacesIC-37 Configuring a Fiber Distributed Data InterfaceIC-38 Using Connection Management InformationIC-39 Fddi Configuration Task ListSpecifying a Fddi IC-40 Enabling Full-Duplex Mode on the FddiEnabling Fddi Bridging Encapsulation Modifying the C-Min Timer Setting the Token Rotation TimeSetting the Transmission Valid Timer Controlling the Transmission TimerControlling SMT Frame Processing Modifying the TB-Min TimerModifying the Fddi Timeout Timer Setting the Bit ControlIC-43 Setting Fddi Frames Per Token LimitControlling the CMT Microcode Starting and Stopping FddiIC-44 Configuring a Hub InterfaceControlling the Fddi SMT Message Queue Size Preallocating Buffers for Bursty Fddi TrafficIC-45 Enabling a Hub PortDisabling or Enabling Automatic Receiver Polarity Reversal Disabling or Enabling the Link Test FunctionIC-46 Enabling Source Address ControlEnabling Snmp Illegal Address Trap IC-47 Configuring a LAN Extender InterfaceConnecting a LAN Extender to a Core Router Expanded View of the Connection to a Core RouterManagement of the LAN Extender Interface Installing a LAN Extender at a Remote SiteDiscovering the MAC Address Upgrading Software for the LAN ExtenderIC-49 Configuring the LAN ExtenderIC-50 LAN Extender Interface Configuration Task ListConfiguring and Creating a LAN Extender Interface IC-51 Defining Packet FiltersIC-52 Filtering by MAC Address and Vendor CodeIC-53 Controlling Priority QueueingIC-54 Controlling the Sending of Commands to the LAN ExtenderIC-55 Restarting the LAN ExtenderDownloading a Software Image to the LAN Extender IC-56 Troubleshooting the LAN ExtenderIC-57 System OKIC-58 Configuring a Token Ring InterfaceEnabling Early Token Release Token Ring Interface Configuration Task ListDedicated Token Ring Port Adapter Specifying a Token Ring InterfaceMonitoring and Maintaining the Port LAN Interface Configuration ExamplesConfiguring PCbus Token Ring Interface Management Enabling Token Ring Concentrator PortIC-61 Ethernet Encapsulation Enablement ExampleFull Duplex Enablement Operation Example PA-12E/2FE Port Configuration ExamplesIC-62 PA-VG100 Port Adapter Configuration ExampleIC-63 Fast EtherChannel Configuration ExamplesIC-64 Fddi Frames Configuration ExampleIC-65 Hub Configuration ExamplesHub Port Startup Examples Hub Port Shutdown ExamplesMAC Address Filtering Example LAN Extender Enablement Interface ExampleLAN Extender Interface Access List Examples Snmp Illegal Address Trap Enablement for Hub Port ExampleIC-67 Ethernet Type Code Filtering ExampleIC-68

IC-23 specifications

Cisco Systems IC-23 is a robust networking device designed to address the ever-evolving demands of modern enterprises. As part of Cisco's extensive portfolio, the IC-23 serves as an ideal solution for organizations seeking to enhance their network performance, reliability, and scalability.

One of the standout features of the Cisco IC-23 is its high-speed connectivity options. With support for both wired and wireless communications, this device can seamlessly integrate into a wide range of network architectures. It offers multiple Gigabit Ethernet ports, enabling rapid data transfer and facilitating the connection of numerous devices without compromising performance.

Another key characteristic of the IC-23 is its advanced security protocols. Data breaches and cyber threats are persistent concerns in today's digital landscape, and Cisco addresses these challenges head-on with robust security measures. The IC-23 incorporates features such as firewall capabilities, intrusion detection systems, and secure VPN support, ensuring that sensitive information remains protected while traversing the network.

The IC-23 also leverages Cisco's renowned software-defined networking (SDN) capabilities. This technology allows businesses to manage their network resources dynamically, ensuring optimal performance based on real-time demands. As a result, organizations can easily adjust their network configurations to meet fluctuating workloads, enhancing both efficiency and cost-effectiveness.

Scalability is another critical feature of the IC-23, making it an excellent choice for growing companies. Cisco has designed this device to accommodate increasing data traffic without necessitating a complete overhaul of existing infrastructure. This adaptability ensures that organizations can expand their networks smoothly as their operations evolve.

Moreover, the IC-23 supports a variety of network management tools, providing IT teams with the insights needed to monitor performance and troubleshoot issues proactively. Cisco's user-friendly interface simplifies the process of network management, allowing administrators to optimize resources and maintain continuous uptime.

In conclusion, Cisco Systems IC-23 stands out as a highly capable networking solution tailored for modern enterprises. With its high-speed connectivity, comprehensive security features, SDN capabilities, scalability, and intuitive management tools, the IC-23 is well-equipped to meet the demands of today’s digital environments. As organizations continue to navigate the complexities of the digital age, the IC-23 prepares them to thrive in an increasingly interconnected world.