Cabletron Systems CSX400 - Manual (Page 49)

The Spanning Tree Protocol Window 3-29
CSX Bridge View
Figure 3-13. Spanning Tree Protocol Window
The Spanning Tree Protocol window displays the following information:
Spanning Tree Version
The version shows the Spanning Tree Protocol type employed by this bridge:
¥ IEEE 802.1d
¥ DEC LAN 100
¥ None
You must use either 802.1d or DEC to interconnect all bridges in a network using
parallel bridges. By default, a Cabletron bridge turns on the 802.1d Spanning Tree.
All of CabletronÕs bridge products have the ability to use either the 802.1d or DEC
Spanning Tree version, or they can be set so that no version is in effect. (A bridge
should be set to None if there are no redundant loops incorporated within the
network.)
Designated Root
This value represents the bridge that is the current Root Bridge as determined by
the STA. The Designated Root value consists of the conÞgurable portion of the
bridge ID (i.e., the Þrst two octets of the eight-octet-long bridge ID) and your
deviceÕs MAC address (the last six octets of the bridge ID). This value is used as
!
CAUTION
All bridges in a network must use the same Spanning Tree version. Mixing Spanning Tree
Algorithm protocols will cause an unstable network.