Cabletron Systems SSIM-H2-02 manual STP Cost Modification

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Figure 11. STP Cost Modification

In Figure 11, TR Switch 2 and Ethernet Switch 2 know that the cost of the Secondary link is 20,000 higher than the cost of the primary link seen by TR Switch 1 and Ethernet Switch 1. This means that the secondary link will be blocked on one of its ends.

To manually configure spanning-tree costs for a backup connection to the Ethernet, set each connection attribute to Primary and then change the spanning-tree costs must be changed on each side of the backup link.

SSIM-H2-02 Fast Ethernet - Translational Switch SmartStack Interface Module Installation and User Guide Configuration