Terms and Definitions
Fixed Switch Configuration Guide 15-37
Max age Maximum time (in seconds) the bridge can wait without receiving a configuration
message (bridge “hello”) before attempting to reconfigure.
MST region An MSTP group of devices configured together to form a logical region. The MST
region presents itself to the rest of the network as a single device, which simplifies
administration.
MSTI Multiple Spanning Tree Instance. See Table 15-4 on page 15-16 for MSTI support
per platform.
Path cost Sum of the port costs in the best path to the root bridge.
Port cost Value assigned to a port based on the speed of the port. The faster the speed, the
lower the cost. This helps to determine the quickest path between the root bridge
and a specified destination. The segment attached to the root bridge normally has a
path cost of zero.
Port priority Assigns a port’s priority in relation to the other ports on the same bridge.
Root bridge Logical center of the Spanning Tree, used by STP to determine which paths to block
and which to open.
Root port Port in an active topology through which the root bridge can be reached.
SID Spanning tree identifier. By default, SID 0 is assumed. VLANs are mapped to SIDs
using their FID association.
SpanGuard Prevents Spanning Tree respans that can occur when BPDUs are received on user
ports and notifies network management that they were attempted.
Table 15-11 Spanning Tree Terms and Definitions (continued)
Term Definition
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