Cabletron Systems 7C04-R, 7C03 manual Fddi Connection Rules, SMT Connection Policy Window

FDDI Management

Figure 4-10. SMT Connection Policy Window

FDDI Connection Rules

By default, all connections are allowed except the illegal M—>Mconnection; the following table summarizes the FDDI connection rules:

Table 4-1. FDDI Connection Rules

!

CAUTION

	A	B	S	M
A	V, U (T)	V	V, U	V, DH
B	V	V, U (T)	V, U	V, DH
S	V, U	V, U	V	V
M	V, DH	V, DH	V	X

V— valid connection X — illegal connection

U — undesirable (but legal) connection

T — connection can lead to a twisted ring configuration

DH — when both A and B are connected to M ports, a dual-homing configuration results. See the following page for more information on dual homing.

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 connection is made, even when that connection is allowed.

4-22 Configuring the SMT Connection Policy