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Background on ATM

Several possibilities exist to route IP traffic over ATM networks [34]. The OC3MON software was designed to work only with IP traffic encoded using LLC/SNAP encapsulation (cf. [3], p. 208) conforming to RFC1483 [11] (i.e. on top of ATM AAL5 [*]).

The software directs each ATM card to perform AAL5 reassembly on a specified range of virtual circuit and virtual path identifiers (VCI/VPI).

Figure 3.13: ATM Header Structure at the UNI
\epsfig {file=xfigpics/uniheader.xfig.eps}