3Com 3C780 User Guide - Page 83

Configuring the Hub 3-15 Table 3-4. Definitions for the Port Connection Rules (continued) Condition Indicator Port Connection Condition Definition of Port Condition W Wrap state Exists when a break in the primary ring occurs and the stations on either side of the break join the primary and secondary rings. It can also indicate that the ring is wrapped at a particular port. T Twisted ring Exists when an A-to-A or a B-to-B connection is formed. It divides the network into two groups of stations that disagree on which token ring is the primary ring. The connections listed below are not allowed: s M to M: an illegal connection s A to A: an undesirable connection that creates a twisted ring s B to B: an undesirable connection that creates a twisted ring The connection rules do not necessarily prevent undesirable connections. An "undesirable connection" designation reflects the connection status of the sending node only. The connection can still be made if the receiving node exhibits an acceptable connection status. Configuring Modules You can only configure the module inserted in slot 1, and you can only configure the two leftmost ports (the attachment ports) of that module. The attachment port configuration is stored in nonvolatile RAM. Any attachment port configuration changes that you make take effect when the system is reinitialized. To reinitialize the hub, execute the reset command.