Brocade Fabric OS Administrator's Guide Supporting Fabric OS v6.3.0 (53-1001336-02, November 2009)

300 Fabric OS Administrator’s Guide

53-1001336-02

Domain ID offset modes

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 17 and Table 18 a for the internal representation of domain ID offset values in IM2 and IM3

respectively.

For instructions to convert decimal numbers to hexadecimal, refer to Appendix E, “Hexadecimal”.

When changing from IM3 with a 239 Domain ID configuration to IM2, you must first reconfigure the

domain ID offset to a value supported in IM2 or IM3 or the operation fails.

Following are the configurable domain ID offset modes:

• Domain ID default mode (McDATA Legacy domain ID mode) — In this mode, a default offset of

0x60 (96) is used. The default mode is used when you enable IM2 or IM3 without specifying a

Domain ID offset.

In IM 2: You only need to enter a decimal number in the 1-31 range when configuring a Domain

ID in default mode.

TABLE 52 Internal representations of ID domain offsets in IM2.

Domain Offset Domain ID PID Area affected

0x00 0x01 01XXYY

0x20 0x21 21XXYY

0x40 0x41 41XXYY

0x60 0x01 61XXYY

0x80 0x81 81XXYY

0xA0 0xA1 A1XXYY

0xC0 0xC1 C1XXYY

TABLE 53 Internal representations of ID domain offsets in IM3.