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Fddi connection rules, Fddi connection rules -22 – Cabletron Systems 7C03 User Manual

Page 90

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FDDI Management

4-22

Configuring the SMT Connection Policy

Figure 4-10. SMT Connection Policy Window

FDDI Connection Rules

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

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.

Table 4-1. FDDI Connection Rules

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

!

CAUTION

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.

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