Dell PowerEdge M600 Fabric OS Administrator’s Guide - Page 339
Domain ID offset modes
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Domain ID offset modes 14 FIGURE 50 Typical direct E_Port configuration Domain ID offset modes The domain ID offset in interopmode 3 (IM3) allows an M-EOS switch to operate in a fabric that contains domain IDs other than 1-31. In interopmode 2 (IM2) the domain ID offset can only be in the 1-31 range. In IM3, the domain ID offset only changes the range of domain IDs used, the restriction of 31 switches in a fabric remains. You can select a domain ID offset, for example 0x00, 0x20, 0x40, 0x60, 0x80, 0xa0, or 0xc0, to allow Fabric OS switches in IM2 or IM3 to work in all of the domain ID ranges currently supported by Fabric OS. By default, Fabric OS switches operate in the legacy domain ID mode offset 96 (0x60). When you change the domain ID offset, the Fabric OS switches must be offline and in the default domain ID mode or in a domain ID offset mode with the same domain ID offset. This can be an interopmode or an offset mode range. When switches attempt to join with a non-matching domain ID offset, they will segment. A Fabric OS switch that is online and is joined to another fabric that contains a switch with an out-of-range domain ID will also segment. Using the interopMode --enable -mcdata/openmcdata command, configured domain ID offset values do not change when you switch between IM2 and IM3, but the configured values behave differently. In an IM2 fabric in legacy offset mode, the device offset is 0x60 but the domain controller offset is 0x20. For all other domain ID offset values, the device offset is the same as the domain controller offset. In IM3 the device offset is always the same as the domain controller offset. The offset is used to define the minimum and maximum of the domain ID range. Refer to Table 54 and Table 55 on page 300 for the internal representation of domain ID offset values in IM2 and IM3 respectively. Fabric OS Administrator's Guide 299 53-1001763-02
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