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
8-4
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 8 Troubleshooting Ports
Overview of the FC-MAC Driver and the Port Manager
Note
We recommend that you do not disable and then enable a T or TE port. This would affect all the VSANs
crossing the EISL instead of just the VSAN experiencing the isolation problem.
Limitations and Restrictions
•
You must administratively enable a port with the
no shut
command. When the interface is enabled,
the administrative state of the port is up. If you administratively disable an interface with the
shut
command, the administrative state of the port is down, and the physical link layer state change is
ignored.
•
For a port to be in an up operational state where it can transmit or receive traffic, the interface must
be administratively up, the interface link layer state must be up, and the interface initialization must
be complete.
•
The interface cannot transmit or receive data when a port’s operational state is down.
•
The interface is operating in TE mode when a port’s operational state is trunking.
Overview of the FC-MAC Driver and the Port Manager
This section describes the internal details of port related components in Cisco SAN-OS. Use this section
to understand the underlying functions that may be causing port related problems.
The FC-MAC driver resides in the module component of the Cisco MDS 9000 Family SAN-OS software.
It performs the following functions:
•
Initialization of FC-MAC ASIC.
•
Speed negotiation.
•
Link/loop port initialization and credit recovery.
•
Statistics collection.
Nonparticipating
FL ports cannot participate in loop operations. It
may happen if more than one FL port exists in the
same loop, in which case all but one FL port in that
loop automatically enters nonparticipating mode.
Only FL
ports and RL
ports
PortChannel administratively
down
The interfaces belonging to the PortChannel are
down.
Only
PortChannel
interfaces
Suspended due to
incompatible speed
The interfaces belonging to the PortChannel have
incompatible speeds.
Suspended due to
incompatible mode
The interfaces belonging to the PortChannel have
incompatible modes.
Suspended due to
incompatible remote switch
WWN
An improper connection is detected. All interfaces
in a PortChannel must be connected to the same
pair of switches.
Table 8-1
Reason Codes for Nonoperational States (continued)
Reason Code
Description
Applicable
Mode
