Technical data

Other ConÞguration Views
Spanning Tree Port ConÞguration View
ConÞguration & Station Table Views TRBMIM
3-12 Management Module Guide
Ring Out Number Ð This Þeld displays the segment number that
corresponds to the target segment this port is considered to be connected to by
the bridge.
Maximum Hop Count Ð This Þeld displays the number of routing
descriptors allowed in an All Paths or Spanning Tree Explorer frame.
Largest Frame Size Ð This Þeld identiÞes the maximum size of the INFO
Þeld that this port currently can send or receive. You can highlight this entry
and substitute any desired higher or lower value; the program will round your
entry up or down (depending on the associated device) to the nearest
applicable value deÞned by the IEEE 802.5M SRT Addendum. The bridge
uses this value to determine if modiÞcation of the LargestFrame Þeld of the
Routing Control Þeld of the Routing Information Field is necessary.
The STE Span Mode button determines how the current port will behave
when presented with a Spanning Tree Explorer frame. Clicking on this button
causes the system to display a pop-up list of three allowed values, as follows:
Auto-Span Ð This selection can be returned only by a bridge that both
implements the Spanning Tree protocol and also has use of the protocol
enabled on this port. Given these conditions, the frame will accept or
propagate a frame if the port is in the forwarding state; otherwise, the port
will silently discard the frame.
Disabled Ð This selection means that the port will not send or receive any
Spanning Tree Explorer packets, which instead will be silently discarded.
Forced Ð This selection means that the port will always accept and
propagate Spanning Tree Explorer frames. (This allows a manually
conÞgured Spanning Tree for this class of packet to be conÞgured. Unlike
transparent bridging, this is not catastrophic to the network if there are
loops.)
When you select the desired spanning mode, the mode name displayed as the
new button readout, remaining in effect until a different mode is selected.
Spanning Tree Port ConÞguration View
Opening the Spanning Tree Port ConÞguration View
If you highlight either Logical Port icon area in the Logical Device icon for the
TRBMIM in the Logical Device view, you can access the Spanning Tree Port
ConÞguration view (see Figure 3-4) by any of three methods: (1) double-click
inside the status label on the Logical Port icon, (2) press the right mouse
button and then select the Port ConÞguration option on the displayed device
STE Span Mode