Allied Telesis SwitchBlade x3100 Series Manual page 389

Spanning Tree Protocol (STP and RSTP) Introduction
Changing the STP PRIORITY, using either of the previous commands, restarts the STP algorithm, so that elec-
tions for the root bridge and designated bridges begin anew, without resetting STP counters. To display general
information about STPs on the switch, use the command SHOW STP.
4.5.3.12 Force Version
This parameter is used for RSTP. This parameter allows the user to specify that the bridge should operate in the
STP_ORIGINAL mode, RSTP, or STP_COMPATIBLE_RSTP mode. If the STP_COMPATIBLE_RSTP mode
is chosen, the RSTP will be compatible with other switches in the network that may not use RSTP and therefore
use older parameter values and ranges.
4.5.3.13 Edge Port
This parameter allows the user to specify a port as an "Edge Port" when it is expected that a port will be
directly connected to a host (i.e. a port at the "edge" of the Bridged LAN). Additional processing is associated
with the use of this parameter to verify that a port identified as an "Edge Port" by the user is not actually con-
nected to another bridge. This parameter and its associated processing can facilitate a port state transition
directly to the forwarding state as part of the RSTP processing.
In the SET STP INTERFACE command, set EDGEPORT=TRUE to enable this for RSTP.
4.5.3.14 Point-to-Point Port
This parameter allows the user to specify a port as a Point-to-Point Port when it is expected that it will be con-
nected to exactly one other bridge. Additional processing is associated with this parameter to automatically
determine whether or not the port should be considered a point-to-point connection, when so indicated by the
user via (auto).parameter setting
The Point-to-Point Port parameter, and its associated processing, is utilized by the RSTP to facilitate the rapid
transition of a port into the forwarding state under certain conditions specific to Point-to-Point ports only.
In the SET STP INTERFACE command, set POINT2POINT=TRUE or AUTO to enable this for RSTP.
In most cases, select AUTO so that the system can determine the port connection.
Note:
4.5.3.15 Transmit Hold Count
This parameter allows the user to specify the maximum BPDU transmission rate for any port on the bridge,
which therefore determines how much STP control traffic is going into the network. The default value for this
parameter is 6, indicating that at most 3 BPDUs can be transmitted from any port in a given Hello Time period
(2 seconds by default).
In the SET STP command, the parameter is TXMAX; the range is 1 to 10 (with the default of 6).
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Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)