Cisco Systems DSC9148D8G48PK9 Trunk Modes, Trunk Link Default, Your Trunk Mode Configuration

Chapter 5 Configuring Trunking

Information About Trunking

Table 5-1	Supported Trunking Protocols
Trunk Link		Default
TE-TE port link		Cisco EPP (PTP)
TF-TN port link1		FC-LS Rev 1.62 EVFP
TF-TNP port link		Cisco EPP (PTP)
E or F PortChannel		Cisco EPP (PCP)
TF Port Channel		Cisco EPP (PTP and PCP)
Third-party TF-TNP port link1		FC-LS Rev 1.62 EVFP

1. These features are not currently supported.

By default, the trunking protocol is enabled on E ports and disabled on F ports. If the trunking protocol is disabled on a switch, no port on that switch can apply new trunk configurations. Existing trunk configurations are not affected. The TE port continues to function in trunk mode, but only supports traffic in VSANs that it negotiated with previously (when the trunking protocol was enabled). Also, other switches that are directly connected to this switch are similarly affected on the connected interfaces. In some cases, you may need to merge traffic from different port VSANs across a non-trunking ISL. If so, disable the trunking protocol.

Note We recommend that both ends of a trunking link belong to the same port VSAN. On certain switches or fabric switches where the port VSANs are different, one end returns an error and the other end is not connected.

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, determine the trunking state of the link and the port modes at both ends (see Table 5-2).

Table 5-2	Trunk Mode Status Between Switches
Your Trunk Mode Configuration			Resulting State and Port Mode
Port Type	Switch 1	Switch 2	Trunking State	Port Mode
E ports	On	Auto or on	Trunking (EISL)	TE port
	Off	Auto, on, or off	No trunking (ISL)	E port
	Auto	Auto	No trunking (ISL)	E port
Port Type	Core Switch	NPV Switch	Trunking State	Link Mode
F and NP	On	Auto or on	Trunking	TF-TNP link
ports
	Auto	On	Trunking	TF-TNP link
	Off	Auto, on, or off	No trunking	F-NP link

	Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
5-4	OL-29284-01, Release 6.x