Cabletron Systems SSIM-H2-02 manual Redundant Connections to Fast Ethernet Network

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For each CRF of translational links connected to the same Ethernet cloud, a connection attribute can be assigned:

—Primary connection – for a main connection to the Ethernet cloud (default value for each CRF). This connection is always forwarding if active.

—Secondary 1 – for a backup connection to the Ethernet cloud. This connection is always blocking if the Primary is active.

—Secondary 2 – for a second backup connection to the Ethernet cloud. This connection is always blocking if the Primary or the Secondary 1 are active.

Each CRF of translational links connected to the same Ethernet cloud must have a different connection attribute set.

Figure 9. Redundant Connections to Fast Ethernet Network

The described spanning tree configuration results in exactly one forwarding link between Ethernet and Token Ring clouds, additional links becoming stand-by. To migrate from Token Ring to Ethernet you should, over time, physically split the Token Ring cloud into disjoint networks to increase bandwidth between Token Ring and Ethernet.

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