SNAX/XF and SNAX/APN Configuration and Management Manual

Configuring for Token-Ring Support
SNAX/XF and SNAX/APN Configuration and Management Manual—425836-006
9-22
Unique Addressing
In SNA terms, the link station is the equivalent of a PU. Consider the addressing used
to create a connection between PU1 and PU3. The address of PU1 is its SAP/MAC
address, in this case 0440001111000,1 and the address of PU3 is 04400011110002.
There can only be one session uniquely defined by the address
04400011110001,04400011110002.
Other PUs using the same SAP/MAC address 04400011110001 that also need to be
attached to PUs in Station B must connected through a different SAP. In this example,
PU2, that has an address of 04400011110001 must be connected to PU4 through SAP
%H08, the unique address being 04400011110001,08400011110002.
Note that these restrictions apply only to PU-to-PU connections. There may be many
LU-LU sessions channelled through a single PU, and LU6.2 further allows multiple
parallel sessions between two LUs.
Figure 9-13. SAP and PU Addressing
PU1
Station A Station B
SAP
The Ring
MAC
400011110001
PU3
%H04
%H08
LU1 LU2 LU3
PU2
PU4
%H04
400011110002
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