Trunk Modes
By default, trunk mode is enabled on all Fibre Channel interfaces (Mode: E, F, FL, Fx, ST, and SD) on non-NPV switches. On NPV switches, by default, trunk mode is disabled. You can configure trunk mode as on (enabled), off (disabled), or auto (automatic). The trunk mode configuration at the two ends of an ISL, between two switches, determines the trunking state of the link and the port modes at both ends. The preferred configuration on the Cisco MDS 9000 family switches is one side of the trunk set to auto and the other side set to on. In Table 9-11, we summarize the trunk mode status between switches. When connected to a third-party switch, the trunk mode configuration on E ports has no effect. The ISL is always in a trunking disabled ...
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