Enterasys SmartSwitch 6000, User Manual

Page: 198 / 231

Viewing FDDI Information 6-7
FDDI Management
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.
Each SMT entity maintains its own connection policy; however, when two interfaces
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 A—>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-F6’s connection policy
via NetSight Element Manager.
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
!
CAUTION
Though technically legal under FDDI connection rules, undesirable connections will
cause a twisted or wrapped ring.