AIS AI2524 user manual Subinterface Configuration Mode Commands

AI2524 Router Card User’s Manual

transmitter-delay	Set dead-time after transmitting a datagram
tunnel	protocol-over-protocol tunneling
tx-queue-limit	Configure card level transmit queue limit
vines	Vines interface subcommands
xns	XNS interface subcommands

Subinterface Configuration Mode Commands

You can configure multiple virtual interfaces (called subinterfaces) on a single physical interface. This feature is supported on serial inter faces with Frame Relay encapsulation.

Subinterfaces appear to be distinct physical interfaces to the various protocols. For example, Frame Relay networks provide multiple point- to-point links called permanent virtual circuits (PVCs). PVCs can be grouped under separate subinterfaces that in turn are configured on a single physical interface. From a bridging spanning-tree viewpoint, each subinterface is a separate bridge port, and a frame arriving on one subinterface can be sent out on another subinterface.

Subinterfaces also allow multiple encapsulations for a protocol on a single interface. For example, a router or access server can receive an ARPA-framed internet packet exchange (IPX) packet and forward the packet back out the same physical interface as a Subnetwork Access Protocol (SNAP)-framed IPX packet. The subinterfaces can be config- ured to support multiple Frame Relay PVCs.

In this example, a subinterface is configured for serial line 2, which is configured for Frame Relay encapsulation. The subinterface is called 2.1 to indicate that it is subinterface 1 of serial interface 2.

Page 4-14	August 1997
	2524UM