7
9F426-02 Module Specific Information
Ring Map Configuration Screen Fields
The following information briefly explains each Ring Map Configuration Screen
field.
FDDI Address
Displays the address of the module. The format of this address (either MAC or
Canonical) is determined by the value you select in the Address Mode field.
MAC Count
Displays the number of MACs (Media Access Controllers) that are attached to the
specified ring.
Current Ring Map
Identifies the ring (FNB-1 or FNB-2) on which a MAC for the specified module
resides, and whether that MAC is located on the primary or secondary path of
that ring. If an additional ring is attached to the specified module, the name of
that additional ring appears as a command at the bottom of the screen.
Address Mode
(Toggle)
Allows you to select the format in which addresses appear on this screen (either
MAC or Canonical). Press the
Space Bar
to toggle to the desired value.
The Ring Map
Displays a series of addresses in upstream/downstream order. These addresses,
which represent each FDDI device attached to the ring, are arranged on the screen
to simulate the circular fashion of a ring. When first displayed, the station at the
upper left corner of this map is your current station. The screen displays node
class, node address, and twisted and/or wrapped conditions (T for twisted, W for
wrapped). The following lists the node class possibilities:
•
NAS (Null Attached Station) Isolated station; station not connected to an FDDI
ring.
•
DAS (Dual Attached Station) Station that does not support M ports, but
connects directly to an FDDI primary and secondary ring using A and B ports.
•
DAC (Dual Attached Concentrator) Station that supports M ports and connects
directly to an FDDI primary and secondary ring using A and B ports.
•
SAS (Single Attached Station) Station that accesses the main ring through a
concentrator, creating a ring of trees topology.
