28. Spanning Tree
ROX™ v2.2 User Guide 316 RuggedBackbone™ RX1500
port costs as negotiated (20,000 for 1Gbps, 200,000 for 100 Mbps links and 2,000,000 for 10 Mbps
links). For MSTP, this parameter applies to both external and internal path costs.
28.4.3. Bridge MSTI Parameters
Figure 28.12. Key Settings form
To configure parameters using the Key Settings form and MSTP Instance form, navigate to switch/
spanning-tree/mstp-instance.
Figure 28.13. MSTP Instance form
MSTP Instance ID
Synopsis: integer
MSTP Instance ID
Bridge Priority
Synopsis: string - one of the following keywords { 61440, 57344, 53248, 49152, 45960, 40960,
36864, 32768, 28672, 24576, 20480, 16384, 12288, 8192, 4096, 0 }
Default: 32768
Bridge Priority provides a way to control the topology of the STP connected network. The desired
root and designated bridges can be configured for a particular topology. The bridge with the lowest
priority will become the root. In the event of a failure of the root bridge, the bridge with the next
lowest priority will then become the root. Designated bridges that (for redundancy purposes) service
a common LAN also use priority to determine which bridge is active. In this way, careful selection
of bridge priorities can establish the path of traffic flows in normal and abnormal conditions.
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