Configuring Spanning Tree Parameters Spanning Tree Operating Modes
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 6-25
• Dynamic aggregate link (LACP) functions properly between OmniSwitch and Cisco switches. The
Cisco switches send the BPDUs only on one physical link of the aggregate, similar to the OmniSwitch
Primary port functionality. The path cost assigned to the aggregate link is not the same between
OmniSwitch and Cisco switches since vendor-specific formulas are used to derive the path cost.
Manual configuration is recommended to match the Cisco path cost assignment for an aggregate link.
For more information on the configuration of path cost for aggregate links, refer to “Path Cost for Link
Aggregate Ports” on page 6-38.
The table below shows the default Spanning Tree values.
Parameters OmniSwitch Cisco
Mac Reduction Mode Enabled Disabled
Bridge Priority 32768 32768
Port Priority 128 32 (catOS) / 128 (IOS)
Port Path Cost IEEE Port Speed Table IEEE Port Speed Table
Aggregate Path Cost Proprietary Table Avg Path Cost / NumPorts
Default Path Cost Mode Short (16-bit) Short (16-bit)
Max Age 20 20
Hello Time 2 2
Forward Delay Time 15 15
Default Protocol RSTP (1w) Per Vlan PVST+ (1d) Per Switch
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