Cabletron Systems 7000 manual Settings, Vpi

ATM Configuration

Settings

The Settings portion of the window contains a list box which displays information about each of the currently conÞgured PVCs, as well as the Þelds used to conÞgure new connections:

I/F	The device interface on which the PVC was conÞgured.
	Note that interfaces installed in a 7C0x chassis are
	indexed following an XXXXYY format, where X = the slot
	number in which the module containing the interface is
	installed, times 10,000; and Y = the physical index
	assigned to the port interface on the module. For
	example, an index of 40001 would refer to port 1 on the
	module installed in slot 4 of the chassis.

NOTE

For some 7A06 Þrmware versions, the I/F Þeld will display a bogus value (like the Ò31Ó displayed in Figure 6-1); check the I/F Þeld at the bottom of the window for the correct interface index values.

VPI	Displays the Virtual Path IdentiÞer assigned to the
	connection; current versions of 7A06-01 Þrmware allow
	values from 0 - 3. Virtual Path IdentiÞers are used to
	group virtual connections, allowing for channel trunking
	between ATM switches. Each VPI can be conÞgured to
	carry many different channels (designated by VCIs)
	between two points.
VCI	Displays the Virtual Channel IdentiÞer assigned to the
	connection; allowable values are 0 - 1023 for each VPI.
	Each assigned VCI must be unique within its deÞned
	VPI: for example, you can assign a VCI of 14 as many as
	four times: once with a VPI of 0, once with a VPI of 1, and
	so on. Remember, it is the combined VPI and VCI
	designations assigned to a channel that creates the
	grouping of virtual connections.
Encapsulation Type	Displays the method used to encapsulate LAN packets
	on the selected circuit. Current versions of 7A06-01
	Þrmware use 802.3 VC-based multiplexing for bridging
	protocols (designated VC MUX 802.3 Bridged); future
	versions will add support for ATM Forum LAN
	Emulation and CabletronÕs SecureFast Switching. You
	may also see some connections assigned a type of
	ÒotherÓ; these are default connections that cannot be
	modiÞed or deleted.

Accessing the ATM Connections Window 6-3