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FDDI Management
4-6 Connection Policy
Connection Policy
The SMT Connection Policy determines which types of connections are allowed
among the four FDDI port types: A, B, M (Master), and S (Slave). FDDI protocol
forbids Master—>Master connections; all other connection types are legal,
although some are considered to be undesirable.
The Connection Policy window, Figure 4-3, lists potential connection types in a
“Reject X-Y” format, where X represents the FDDI port on the selected module,
and Y represents the attaching node. An X in the checkbox next to a Connection
Policy indicates that the connection has been disallowed.
Figure 4-3. The Connection Policy Window
The following table summarizes the FDDI connection rules:
V —valid connection
X —illegal connection
U —undesirable (but legal) connection; this requires that SMT is notified.
P —valid, but when both A and B are connected to M ports (a dual-homing
configuration), only the B connection is used.
Table 4-1. FDDI Connection Rules
ABSM
AV, U V V, U V, P
B V V, U V, U V, P
S V, U V, U V V
MVVVX
!
CAUTION
Though technically legal under FDDI connection rules, undesirable connections will
cause a twisted or wrapped ring.