Cabletron Systems 2000 manual Fddi Applications

FDDI Applications

The following table summarizes the FDDI connection rules:

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CAUTION

Table 6-1. FDDI Connection Rules

	A	B	S	M
A	V, U	V	V, U	V, P
B	V	V, U	V, U	V, P
S	V, U	V, U	V	V
M	V	V	V	X

V — valid connection X — illegal connection

U — undesirable (but legal) connection

P — valid, but when both A and B are connected to M ports (a dual-homing configuration), only the B connection is used.

Though technically legal under FDDI connection rules, undesirable connections will cause a twisted or wrapped ring.

Each device has its own connection policy; however, when two devices attempt to connect, their combined established connection policies dictate the connections that will be allowed. In an attempted connection between two nodes, the most lenient policy will determine whether the connection (as long as it is legal) can be made. For example, if two FDDI nodes attempt an AÑ>A connection, and this connection is not allowed at one FDDI node but allowed at the other, the connection would be accepted. If the connection policy at both nodes disallows the connection, the connection will be rejected.

This is a read-only window; you currently cannot edit the HSIM-F6Õs connection policy directly from this window.

Connection Policy Window 6-7