Stride Industrial Ethernet Switches User Manual 2nd Ed. Rev. B
Appendix B - Glossary
STP: Spanning Tree Protocol
STP terms:
• Blocking = A port in this state does not participate in frame relay (pass frames received to other
locations). Once a port is in this state, it is prevented from the possibility of frame
duplication causes by multiple paths in an active topology.
• Listening = A port in this state is about to participate in frame relay, but is not involved in any
relay of frames (no frames will be forwarded). The reason for not entering frame
relay immediately is to ensure that there are no temporary loops introduced when the
network topology is changing. During this state, the bridge will disable all learning
states on its ports to prevent the race conditions when ports are changing roles and the
forwarding process will discard all frames and not submit any frames for transmission.
Meanwhile BPDUs can still be received and forwarded to keep the algorithm running.
• Learning = A port in this state is about to participate in frame relay, but it is not involved in any
relay of frames. Frame relays are not performed to prevent the creation of temporary
loops during the active topology of a changing bridged LAN. In addition, the
forwarding process will discard all frames and not submit any frames for transmission.
The reason for enabling learning is to acquire information prior to any frame relay
activities. Information gathered will be used and placed in the filtering database (MAC
table) to reduce the number of frames being unnecessarily relayed.
• Forwarding = A port in the forwarding state is currently participating in frame relay. BPDUs will
include the forwarding port in the computation of the active topology. BPDUs
received are processed according to the Spanning Tree algorithm and transmitted
based on the hello time or BPDU information received.
Subnet mask: A number representing the digits that identify the network portion of an IP
address that includes network and host identification.
TCP: Transmission Control Protocol
Telnet: Means of accessing the CLI
TFTP: Trivial File Transfer Protocol
TOS: Type of Service
UDP: User Datagram Protocol
VLAN: Virtual Local Area Network
B-4
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