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Configuring LAN Interfaces

Configuring an Ethernet or Fast Ethernet Interface

IC-28

Cisco IOS Interface Configuration Guide

Configuring PA-12E/2FE Port Adapter

The PA-12E/2FE Ethernet switch port adapter provides Cisco 7200 series routers with up to twelve

10-Mbps and two 10/100-Mbps switched Ethernet (10BASE-T) and Fast Ethernet (100BASE-TX)

interfaces for an aggregate bandwidth of 435 Mbps, full-duplex. The PA-12E/2FE port adapter supports

the Ethernet, IEEE 802.3, and IEEE 802.3u specifications for 10-Mbps and 100-Mbps transmission over

UTP cables.

The PA-12E/2FE port adapter offloads Layer 2 switching from the host CPU by using store-and-forward

or cut-through switching technology between interfaces within the same virtual LAN (VLAN) on the

PA-12E/2FE port adapter. The PA-12E/2FE port adapter supports up to four VLANs (bridge groups).

Note The PA-12E/2FE port adapter is a dual-width port adapter, which means it occupies two

horizontally aligned port adapter slots when installed in a Cisco 7200 series router.

(Single-width port adapters occupy individual port adapter slots in a Cisco 7200 series

router.)

All interfaces on the PA-12E/2FE port adapter support autosensing and autonegotiation of the proper

transmission mode (half-duplex or full-duplex) with an attached device. The first two PA-12E/2FE

interfaces (port 0 and port 1) also support autosensing and autonegotiation of the proper connection

speed (10-Mbps or 100-Mbps) with an attached device. If an attached device does not support

autosensing and autonegotiation of the proper transmission mode, the PA-12E/2FE interfaces attached

to the device automatically enter half-duplex mode. Use the show system:running-config command to

determine if a PA-12E/2FE interface is autosensing and autonegotiating the proper transmission mode

with an attached device. Use the full-duplex and the half-duplex commands to change the transmission

mode of a PA-12E/2FE interface. After changing the transmission mode, use the show interfaces

command to verify the interface’s transmission mode.

Table 3 Relationship Between Duplex and Speed Command Options

Duplex Command Speed Command Resulting System Actions

duplex auto speed auto

Autonegotiates both speed and

duplex modes.

duplex auto speed 100 or speed 10

Autonegotiates both speed and

duplex modes.

duplex half

duplex full

speed auto

Autonegotiates both speed and

duplex modes.

duplex half speed 10

Forces 10 Mbps and half duplex.

duplex full speed 10

Forces 10 Mbps and full duplex.

duplex half speed 100

Forces 100 Mbps and half

duplex.

duplex full speed 100

Forces 100 Mbps and full

duplex.

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