Configuring Transparent Bridging
Transparent and SRT Bridging Configuration Task List
BC-55
Cisco IOS Bridging and IBM Networking Configuration Guide
The PA-12E/2FE Ethernet switch port adapter provides Cisco7200 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 435Mbps, 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 Layer2 switching from the host CPU by using store-and-forward
or cut-through switching technology between interfaces within the same 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 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.
Note If you use the full-duplex and the half-duplex commands to change the transmission mode
of the first two PA-12E/2FE interfaces (port0 and port 1), the transmission speed of the two
PA-12E/2FE interfaces automatically defaults to 100-Mbps. The first two PA-12E/2FE
interfaces only operate at 10-Mbps when the interfaces are autosensing and autonegotiating
the proper connection speed (10-Mbps or 100-Mbps) with an attached device.
To configure the PA-2E/2FE port adapter, perform the tasks in the following sections (the first task is
required, all other tasks are optional):
•Configuring the PA-12E/2FE Port Adapter
•Monitoring and Maintaining the PA-12E/2FE Port Adapter
•Configuring Bridge Groups Using the 12E/2FE VLAN Configuration WebTool