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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
Switch Management and Operating Concepts 59
Spanning Tree
The IEEE 802.1D Spanning Tree Protocol allows for the
blocking of links between switches that form loops within the
network. When multiple links between switches are detected, a
primary link is established. Duplicated links are blocked from
use and become standby links. The protocol allows for the
duplicate links to be used in the event of a failure of the
primary link. Once the Spanning Tree Protocol is configured
and enabled, primary links are established and duplicated
links are blocked automatically. The reactivation of the
blocked links (at the time of a primary link failure) is also
accomplished automatically – without operator intervention.
The DES-3326S STP allows two levels of spanning trees to be
configured. The first level constructs a spanning tree on the
links between switches. This is referred to as the Switch or
Global level. The second level is on a port group basis.
Groups of ports are configured as being members of a spanning
tree and the algorithm and protocol are applied to the group of
ports. This is referred to as the Port or VLAN level.
On the switch level, STP calculates the Bridge Identifier for
each switch and then sets the Root Bridge and the Designated
Bridges.
On the port level, STP sets the Root Port and the Designated
Ports.
The following are the user-configurable STP parameters for the
switch level:
Parameter Description Default
Value