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SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide Switch Configuration
STP Mode (BRF-to-CRF)
Determines the mode of the internal port from this CRF to the parent BRF. Possible
values are
auto
,
forwarding
,
blocked
.
If set to
auto
, the forwarding/blocking state of the internal link will be determined
by the spanning tree protocol of the parent BRF. If the parent BRF is participating
in the spanning tree protocol, the protocol will determine the state. If the BRF is not
participating in the spanning tree protocol, the internal link is forwarding.
If set to
forwarding
or
blocking
, the internal port will assume these states regardless
of the spanning tree state of the parent BRF.
STP Priority
Priority associated with the internal CRF to bridge port. The CRF with the lowest
priority value has the highest priority and will forward the frames. The default is
128. The possible range is 0 through 255 (decimal).
STP Cost
Cost associated with the internal CRF-to-BRF link. The spanning tree protocol uses
path costs to determine the least expensive path to the root.
STP Participation (CRF-to-Ports)
Whether the ports in this CRF participates in the spanning tree protocol and, if so,
the protocol to be used. Possible values are
No
,
IEEE
and
Cisco
. The default is
No
.
The recommended protocol is IEEE, but if the CRF contains more than one port and
the port(s) are connected to SRT bridges running the IEEE Spanning Tree Protocol
(using the IEEE group address), then the Cisco protocol should be used.
•
If
STP Participation
is set to
No
, then all ports belonging to this CRF will be
set to forwarding mode. You can then override this by blocking a particular
port.
•
If
STP Participation
is set to
IEEE
or
Cisco
, then the selected protocol will
be used to determine the
forwarding
/
blocked
mode of the ports that are
configured with an STP mode of
auto
.
Switch Priority
Priority value for this CRF spanning tree instance (
0
through
65,535
). The priority
is used to construct a bridge id for the CRF as Priority.MAC address (the MAC
address is the base MAC address of the switch + an internal number for the CRF).
The spanning tree entity with the lowest bridge id in a spanning tree becomes the
root. The default is
32,768.
(To change individual port properties, select
Port
Spanning Tree Parameters...
).