Configuring, Modifying, and Monitoring the Unit
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Spanning Tree Parameters
Normally, each switch or bridge in a network participates in STP. The units work together as
peers to determine which links are to forward packets between LANs, and which links are to be
blocked. Links that forward packets are chosen based on which link has the lowest pathcost
and priority. Redundant paths are blocked, unless another link which is a forwarding link is
deactivated, at which the blocked link will then go into a forwarding state.
NOTE: NBase-Xyplex switches are compatible with STP software that conforms to the IEEE
802.1D specification. They are not compatible with other STP versions that do not conform to
this specification (for example, the DEC STP implementation). If you install a NH2025-10
switch in a network where other devices are using non-conforming (i.e., not 802.1D) STP, you
must make sure that no loops exist in the network topology.
Root Bridge
Units that participate in STP compete to be the Root Bridge of the switched network. At start-
up, each unit broadcasts an STP message called a Configuration Bridge Protocol Data Unit
(Configuration BPDU) through each of its interfaces, announcing its bridge ID, including its
priority value and MAC address. The unit with the lowest priority value is recognized as the
Root Bridge. In the event of a tie, the unit with the lowest MAC address becomes the Root.
After the STP topology stabilizes, Hello BPDUs are periodically sent by the Root bridge and are
propagated down the Spanning Tree by other bridges in the switched network. Each bridge
adds its own pathcost before forwarding.
Manually Designating a Root Bridge
By assigning priority values to the switches in your network, you can designate which unit is to
be the Root Bridge, which is to be the 1st backup Root Bridge, 2nd backup Root Bridge, etc.
There are no rules for selecting a Root Bridge. However, most commonly the Root is located in
the middle of the network or at the corporate data center. For instructions on assigning Priority
values, refer to the Spanning Tree Commands section.
Selecting a Designated Switch/Bridge
When a LAN has multiple switches connecting it to a remote LAN, the units compete to
determine which can provide the best service to the LAN. The units that can provide the best
service is recognized as the Designated Switch/Bridge for the LAN. Other units provide
standby connections.