Users Guide

548 Fabric OS Administrator’s Guide
53-1002920-02
Supported topologies for ICL connections
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FIGURE 75 ICL triangular topology with Brocade DCX 8510-8 chassis
During an ICL break in the triangular topology, the chassis that has the connections of the other
two is the main chassis. Any error messages relating to a break in the topology appear in the
RASlog of the main chassis.
For the Brocade DCX Backbone family only: If one ICL is broken but there is a regular ISL, the
triangular topology holds given that the ISL cost is lower than the total cost through the ICL linear
topology. If a direct ICL link between two chassis is broken, the triangular topology is considered
broken when the ISL path between the two switches is a multiple hop. In this case, the triangular
topology broken message is posted independently of the cost of the ISL path being lesser or
greater than the ICL path between the two switches.
Another form is the full nine-mesh topology shown in Figure 76. This topology is supported by DCX
8510-8 Backbones only. (You can use DCX 8510-4 Backbones for a five-mesh topology.)