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Bridging
4-34 Bridge Statistics
When a sending station needs to determine the best route to an intended
destination, it transmits an All Paths Explorer (APE) frame. The APE frame
contains no routing information; it is propagated along all available paths to the
destination station, which then directs a reply back to the source. The Þrst reply
received by the original sending station is considered the most efÞcient route and
is used in subsequent transmissions.
Span. Tree Expl.
Displays the total number of Spanning Tree Explorer (STE) frames received by the
indicated port from its attached segment.
STE frames, also known as Single Route Broadcast frames, follow the topology
established by the Spanning Tree Algorithm.
Transmitted Frames
Specif. Routed
Displays the total number of SpeciÞcally Routed Frames transmitted by the
indicated port onto its attached segment.
All Paths Expl.
Displays the total number of All Path Explorer frames transmitted by the
indicated port onto its attached segment.
Span Tree Expl.
Displays the total number of Spanning Tree Explorer (STE) frames transmitted by
the indicated port onto its attached segment.
Discards
Segment Mismatch
Displays the number of explorer frames discarded because their routing
descriptor Þeld contained an invalid value for a segment attached to the port.
The routing information Þeld of a SpeciÞcally Routed frame contains LAN
Segment In (Ring In)ÐBridge NumberÐLAN Segment Out (Ring Out) information.
If the bridgeÕs LAN Segment Out value does not match the LAN Segment Out
speciÞed in the frameÕs Routing Information Field, the bridge logs a Segment
Mismatch and discards the frame.
Duplicate Segment
Displays the number of frames discarded because the frameÕs Routing
Information Field identiÞes a particular segment more than once.