SMC Networks SMC8624/48T manual Configuring Multiple Spanning Trees, 133

SPANNING TREE ALGORITHM CONFIGURATION

•Migration – If at any time the switch detects STP BPDUs, including Configuration or Topology Change Notification BPDUs, it will automatically set the selected interface to forced STP-compatible mode. However, you can also use the Protocol Migration button to manually re-check the appropriate BPDU format (RSTP or STP-compatible) to send on the selected interfaces.

(Default: Disabled)

Web – Click Spanning Tree, STA, Port Configuration or Trunk Configuration. Modify the required attributes, then click Apply.

Figure 3-55. Configuring Spanning Tree Algorithm per Port

CLI – This example sets STA attributes for port 7.

Console(config)#interface ethernet 1/7	3-168
Console(config-if)#no no spanning-tree spanning-disabled	3-219
Console(config-if)#spanning-tree port-priority 0	3-220
Console(config-if)#spanning-tree cost 50	3-219
Console(config-if)#spanning-tree link-type auto	3-223
Console(config-if)#no spanning-tree edge-port	3-221
Console(config-if)#spanning-tree protocol-migration	3-227
Console(config-if)#

Configuring Multiple Spanning Trees

MSTP generates a unique spanning tree for each instance. This provides multiple pathways across the network, thereby balancing the traffic load, preventing wide-scale disruption when a bridge node in a single instance fails, and allowing for faster convergence of a new topology for the failed instance.

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