AIS AI2524 Configure PPP Half-Bridging, If entered on a dialer or async-group interface, this

Chapter 11: AI2524 Sync PPP Configuration Steps

Disable or Reenable Peer Neighbor Routes

Configure PPP Half-Bridging

The Cisco IOS software automatically creates neighbor routes by de- fault; that is, it automatically sets up a route to the peer address on point-to-point interface when the PPP IPCP negotiation is completed.

In interface configuration mode, disable this default behavior o reenable it once it has been disabled:

zDisable creation of neighbor routes. no peer neighbor-route

zReenable creation of neighbor routes. peer neighbor-route

Note:	If entered on a dialer or async-group interface, this
	command affects all member interfaces.

For situations in which a routed network needs connectivity to a re- mote bridged Ethernet network, a serial or ISDN interface can be con- figured to function as a PPP half-bridge. The line to the remote bridge functions as a virtual Ethernet interface. The router's serial or ISDN in- terface functions as a node on the same Ethernet subnetwork as the re- mote network.

The bridge sends bridge packets to the PPP half-bridge, which con- verts them to routed packets and forwards them to other router pro cesses. Likewise, the PPP half-bridge converts routed packets to Ethernet bridge packets and sends them to the bridge on the sam Ethernet subnetwork.

Note:	An interface cannot function as both a half-bridge and a
	bridge.

Figure 11-1 shows a router with a serial interface configured as a PPP half-bridge. The interface functions as a node on the Ethernet subnet- work with the bridge. Note that the serial interface has an IP address on the same Ethernet subnetwork as the bridge.

August 1997	Page 11-17
2524UM