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Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
OL-29284-01, Release 6.x
Chapter 5 Configuring Trunking
Information About Trunking
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).
Ta b l e 5-1 Supported Trunking Protocols
Trunk Link Default
TE-TE port link Cisco EPP (PTP)
TF-TN port link
1
1. These features are not currently supported.
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 link
1
FC-LS Rev 1.62 EVFP
Ta b l e 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
ports
On Auto or on Trunking TF-TNP link
Auto On Trunking TF-TNP link
Off Auto, on, or off No trunking F-NP link