| Description | This table is the circuit representation in the DLSw
entity. Virtual data links are used to represent any internal
end stations. There is a conceptual row associated with
each data link. Thus, for circuits without an intervening
transport connection, there are two conceptual rows
for each circuit.
The table consists of the circuits being established,
established, and as an implementation option, circuits that
have been disconnected. For circuits carried over
transport connections, an entry is created after
the CUR_cs was sent or received. For circuits between
two locally attached devices, or internal virtual MAC
addresses, an entry is created when the equivalent of
CUR_cs sent/received status is reached.
End station 1 (S1) and End station 2 (S2) are used to
represent the two end stations of the circuit.
S1 is always an end station which is locally attached.
S2 may be locally attached or remote. If it is locally
attached, the circuit will be represented by two rows indexed
by (A, B) and (B, A) where A & B are the relevant MACs/SAPs.
The table may be used to store the causes of disconnection of
circuits. It is recommended that the oldest disconnected
circuit entry be removed from this table when the memory
space of disconnected circuits is needed. |