notes: PPP Half-Bridging

- When a serial interface is configured as a PPP half-bridge, the link to the remote bridge functions as a virtual ethernet interface, with the serial interface functioning as a node on that remote network.
- When a packet is received by the PPP half-bridge, it is converted to a routed packet and forwarded normally.
- The reverse process happens for packets destined for the remote bridge.
- An interface cannot function as both a half-bridge and a bridge.
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COMMANDS
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Enables PPP half-bridging for IP (Must be done before configuring the IP.)

interface Ethernet0
ppp bridge ip
encapsulation ppp
ip address 10.1.1.2 255.0.0.0

- Provides a protocol address on the same subnetwork as the remote network.

example config guide:

http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_example09186a0080093c80.shtml