Command Reference Guide

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The following table describes the Bridge Spanning Tree Configuration Menu options.
Table 112 Bridge Spanning Tree Configuration Menu options
Command
Description
prior <0-65535>
Configures the bridge priority. The bridge priority parameter controls which bridge on
the network is the STP root bridge.
To make this switch the root bridge, configure the bridge priority lower than all other
switches and bridges on your network. The lower the value, the higher the bridge
priority. The range is 0 to 65535, and the default is 32768.
RSTP/MSTP: The range is 0 to 61440, in steps of 4096 (0, 4096, 8192...), and the default is
32768.
hello <1-10>
Configures the bridge hello time. The hello time specifies how often the root bridge
transmits a configuration bridge protocol data unit (BPDU).
Any bridge that is not the root bridge uses the root bridge hello value. The range is 1
to 10 seconds, and the default is 2 seconds.
mxage <6-40>
Configures the bridge maximum age. The maximum age parameter specifies the
maximum time the bridge waits without receiving a configuration bridge protocol
data unit before it reconfigures the STP network. The range is 6 to 40 seconds, and
the default is 20 seconds.
fwd <4-30>
Configures the bridge forward delay parameter. The forward delay parameter
specifies the amount of time that a bridge port has to wait before it changes from
the listening state to the learning state and from the learning state to the forwarding
state. The range is 4 to 30 seconds, and the default is 15 seconds.
cur
Displays the current bridge STP parameters.
When configuring STP bridge parameters, the following formulas must be used:
2*(fwd-1) > mxage
2*(hello+1) < mxage
Spanning Tree port configuration
Command: /cfg/l2/stp <STG number>/port <port number>
[Spanning Tree Port 1 Menu]
prior - Set port Priority (0-255)
cost - Set port Path Cost (1-65535 (802.1d) /
1-200000000 (MSTP/RSTP)/0 for auto)
link - Set port link type (auto, p2p, or shared; default: auto)
edge - Enable/disable edge port
fastfwd - Enable/disable Port Fast Forwarding mode
on - Turn port's Spanning Tree ON
off - Turn port's Spanning Tree OFF
cur - Display current port Spanning Tree parameters
By default for STP/PVST+, Spanning tree is turned Off for downlink ports (1-16), and turned On for uplink
ports (18-21). By default for RSTP/MSTP, Spanning tree is turned Off for all downlink ports (1-16) configured
as Edge ports, and turned On for uplink ports (18-21).
Spanning tree port parameters are used to modify STP operation on an individual port basis. STP port
parameters include:
Port priority
Port path cost