2-14 Cisco BPX 8600 Series Reference
Functional Description
Table 2-2 ATM Cell Addressing Modes
Figure 2-12 BAM, CAM, and SAM Configurations
FastPacket Adaptation to ATM
A specialized adaptation that is of particular interest to users of Cisco equipment is the adaptation of
IPX switch FastPackets to ATM cells. There are a large number of narrowband IPX switch networks
currently in existence that are efficiently carrying voice, video, data, and frame relay. A means must
be provided to allow these networks to grow by providing a migration path to broadband.
Since FastPackets are already a form of cell relay, the adaptation of FastPackets to ATM cells is
relatively simple.
Addressing Mode Hdr. Type Derivation of VPI/VCI Where Used
BAM-BPX switch
Addressing Mode
STI VPI/VCI = Node Derived
Address
Between IPX switch (or IGX switch) and BPX
switches, or between IPX switch (or IGX switch)
nodes.
CAM—
Cloud Addressing Mode
UNI VPI = User Programmed
VCI = Node Derived Address
IPX switch to IPX switch (or IGX switch)
connections over networks using ATM switches that
switch on VPI only. VPI is manually programmed by
user. Terminating IPX switch converts VCI address
to FastPacket address.
SAM—
Simple Addressing Mode
UNI VPI/VCI = User Programmed IPX switch to IPX switch (or IGX switch)
connections over networks using ATM switches that
switch where all routing is manually programmed by
user, both VPI and VCI.
BAM IGX BTM IPXAIT
BAM IPX AIT BPXBNI
CAM IPX AIT IPXAIT
SAM
Note: IPX with AIT card are interchangeable with IGX with BTM card in this diagram.
IPX AIT IGXBTM
ATM cloud
VP switch
ATM cloud
VP/VC switch
H8150
