Fddi Connection Rules - Cabletron Systems 7C03 User Manual

FDDI Management

FDDI Connection Rules

By default, all connections are allowed except the illegal M—>M connection; the
following table summarizes the FDDI connection rules:
V
X
U
T
DH — when both A and B are connected to M ports, a dual-homing configuration
Though technically legal under FDDI connection rules, the undesirable A—>S and
!
B—>S connections will deprive your device of the redundancy protection built in to the
FDDI dual-ring configuration. The SMT entity is notified each time an undesirable
CAUTION
connection is made, even when that connection is allowed.
4-22
Figure 4-10. SMT Connection Policy Window
Table 4-1. FDDI Connection Rules
A
V, U (T)
A
V
B
V, U
S
V, DH
M
— valid connection
— illegal connection
— undesirable (but legal) connection
— connection can lead to a twisted ring configuration
results. See the following page for more information on dual homing.
B S
V V, U
V, U (T) V, U
V, U V
V, DH V
Configuring the SMT Connection Policy
M
V, DH
V, DH
V
X