Cabletron Systems 7C04-R, 7C03 manual Upstream MAC, Vendor, Node Class, Topology

FDDI Management

Upstream MAC

Displays the hardware address of the node’s nearest upstream neighbor. Note that the addresses displayed in this field also respond to any change in display mode from MSB to Canonical, or vice versa.

Vendor

Displays the name of the vendor that manufactured the device, as determined by the first three bytes of the MAC address.

Node Class

Indicates the node type: either station or concentrator.

Topology

Indicates the node’s current MAC configuration topology; possible states are:

Thru	The ring is operating normally, with no cable breaks or
	bad nodes directly upstream or downstream of the
	selected node: the primary path enters the A port and
	emerges from the B port, and is currently active; the
	secondary path enters the B port and emerges from the A
	port, and is not currently in use.
Wrapped	The node is wrapped, due to a cable break, a bad station,
	or management action; the secondary path has been
	wrapped into the primary path to restore the ring.
Isolated	The node is isolated from the ring; a node in this state
	will be the only one displaying in the station list.
A-A Twisted	The ring is in a twisted configuration, because the node’s
	A port has been connected to another A; by necessity,
	somewhere on the ring a B port is connected to another
	B, and a third station has both an A—>A and a B—>B
	connection. The ring can operate normally in a twisted
	condition, but the station with both an A—>A and B—>B
	connection is isolated from the primary ring and residing
	alone on the secondary ring.
A-A Twisted,
Wrapped	The ring is twisted due to an A—>A connection on this
	node, as described above; the ring is also wrapped. Note
	that the wrap condition brings the node with both the
	A—>A and B—>B connection back into contact with the
	rest of the stations on the ring, since the secondary ring
	has become part of the primary ring.
B-B Twisted	The ring is in a twisted configuration, because the node’s
	B port has been connected to another B; again, by
	necessity, somewhere on the ring an A port has been
	connected to another A, and a third station has both and
	A—>A and a B—>B connection. The ring can operate

4-26 Viewing the Station List