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

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Cisco Systems IC-23 manual Enabling a Hub Port, Disabling or Enabling Automatic Receiver Polarity Reversal, IC-45

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