Cisco Nexus 5000 Series Switch CLI Software Configuration Guide, NX-OS 4.0(1a)N1 (OL-16597-01, January 2009)

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32-7
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 32 Configuring Fibre Channel Interfaces
Information About Fibre Channel Interfaces
Buffer-to-Buffer Credits
Buffer-to-buffer credits (BB_credits) are a flow-control mechanism to ensure that Fibre Channel
interfaces do not drop frames. BB_credits are negotiated on a per-hop basis.
In Cisco Nexus 5000 Series switches, the BB_credit mechanism is used on Fibre Channel interfaces but
not on virtual Fibre Channel interfaces. Virtual Fibre Channel interfaces provide flow control based on
capabilities of the underlying physical Ethernet interface.
Isolation due to ELP failure The port negotiation failed. Only E ports
and TE ports
Isolation due to ESC failure The port negotiation failed.
Isolation due to domain
overlap
The Fibre Channel domains (fcdomain) overlap.
Isolation due to domain ID
assignment failure
The assigned domain ID is not valid.
Isolation due to the other side
of the link E port isolated
The E port at the other end of the link is isolated.
Isolation due to invalid fabric
reconfiguration
The port is isolated due to fabric reconfiguration.
Isolation due to domain
manager disabled
The fcdomain feature is disabled.
Isolation due to zone merge
failure
The zone merge operation failed.
Isolation due to VSAN
mismatch
The VSANs at both ends of an ISL are different.
port channel administratively
down
The interfaces belonging to the SAN port channel are
down.
Only SAN
port channel
interfaces
Suspended due to incompatible
speed
The interfaces belonging to the SAN port channel have
incompatible speeds.
Suspended due to incompatible
mode
The interfaces belonging to the SAN port channel have
incompatible modes.
Suspended due to incompatible
remote switch WWN
An improper connection is detected. All interfaces in a
SAN port channel must be connected to the same pair
of switches.
Bound physical interface down The Ethernet interface bound to a virtual Fibre Channel
interface is not operational.
Only virtual
Fibre
Channel
interfaces
STP not forwarding in FCoE
mapped VLAN
The Ethernet interface bound to a virtual Fibre Channel
interface is not in an STP forwarding state for the
VLAN associated with the virtual Fibre Channel
interface
Only virtual
Fibre
Channel
interfaces
Table 32-4 Reason Codes for Nonoperational States (continued)
Reason Code (long version) Description
Applicable
Modes