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When this occurs, part of the SAN fabric is said to be segmented. You can identify a segmentation from the slow flashing orange LED on the ISL port. The following section describes these three conflicts and their possible solution. 2.6.1 Duplicate domain IDs Domain IDs are used to uniquely identify a switch within a fabric. Therefore, each switch within the same fabric must have a unique domain ID. Duplicate domains causes the ISL between the two switches to be segmented as shown in Figure 2-164. Figure 2-164 Domain ID segmentation error log To solve this overlap, change the domain ID of one of the switches participating in the ISL. This can be done using the Web Tools GUI in the Switch Settings tab or using the configure telnet command as shown in 2.3.2, “Connecting to the switch” on page 98. Domain ID overlap can be easily avoided by disabling the switches first using the switchDisable command. When bringing back the switches online automatically, the domain ID is negotiated set to a valid value. 2.6.2 Zoning configuration conflicts When merging two fabrics, zoning information from the two previously separate fabrics is merged as much as possible into the new fabric. Sometimes, zoning inconsistency can occur and zoning information cannot be merged. 248 Implementing an Open IBM SAN
