About Trunk Mode; Configuring Trunk Mode - HP Cisco MDS 9216 - Fabric Switch Configuration Manual

Chapter 24 Configuring Trunking
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
We recommend that both ends of a trunking ISL belong to the same port VSAN. On certain platforms or
Note
fabric switches where the port VSANs are different, one end returns an error, and the other is not
connected.
Tip To avoid inconsistent configurations, shut all E ports before enabling or disabling the trunking protocol.
This section explains how to configure trunking and contains the following topics:
•
•
•
•

About Trunk Mode

By default, trunk mode is enabled in all Fibre Channel interfaces. However, trunk mode configuration
takes effect only in E-port mode. You can configure trunk mode as on (enabled), off (disabled), or auto
(automatic). The default trunk mode is on. 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
Table 24-1
Your Trunk Mode Configuration
Switch 1
On
Off
Auto
Tip The preferred configuration on the Cisco MDS 9000 Family switches is one side of the trunk set to auto
and the other set to on.
Note When connected to a third-party switch, the trunk mode configuration has no effect—the ISL is always
in a trunking disabled state.

Configuring Trunk Mode

To configure trunk mode using Fabric Manager, follow these steps:
OL-16184-01, Cisco MDS SAN-OS Release 3.x
About Trunk Mode, page 24-3
Configuring Trunk Mode, page 24-3
About Trunk-Allowed VSAN Lists, page 24-4
Configuring an Allowed-Active List of VSANs, page 24-6
24-1).
Trunk Mode Status Between Switches
Switch 2
Auto or on
Auto, on, or off
Auto
Resulting State and Port Mode
Trunking State
Trunking (EISL)
No trunking (ISL)
No trunking (ISL)
Cisco MDS 9000 Family CLI Configuration Guide
Trunking Protocol
Port Mode
TE port
E port
E port
24-3