Buffer-To-Buffer Credits; Configuring Fibre Channel Interfaces - Cisco N5010P-N2K-BE Software Configuration Manual

Chapter 32

Configuring Fibre Channel Interfaces

S e n d f e e d b a c k t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m
Table 32-4
Reason Code (long version)
Isolation due to ELP failure
Isolation due to ESC failure
Isolation due to domain
overlap
Isolation due to domain ID
assignment failure
Isolation due to the other side
of the link E port isolated
Isolation due to invalid fabric
reconfiguration
Isolation due to domain
manager disabled
Isolation due to zone merge
failure
Isolation due to VSAN
mismatch
port channel administratively
down
Suspended due to incompatible
speed
Suspended due to incompatible
mode
Suspended due to incompatible
remote switch WWN
Bound physical interface down The Ethernet interface bound to a virtual Fibre Channel
STP not forwarding in FCoE
mapped VLAN

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.
OL-16597-01
Reason Codes for Nonoperational States (continued)
Description
The port negotiation failed.
The port negotiation failed.
The Fibre Channel domains (fcdomain) overlap.
The assigned domain ID is not valid.
The E port at the other end of the link is isolated.
The port is isolated due to fabric reconfiguration.
The fcdomain feature is disabled.
The zone merge operation failed.
The VSANs at both ends of an ISL are different.
The interfaces belonging to the SAN port channel are
down.
The interfaces belonging to the SAN port channel have
incompatible speeds.
The interfaces belonging to the SAN port channel have
incompatible modes.
An improper connection is detected. All interfaces in a
SAN port channel must be connected to the same pair
of switches.
interface is not operational.
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
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
Information About Fibre Channel Interfaces
Applicable
Modes
Only E ports
and TE ports
Only SAN
port channel
interfaces
Only virtual
Fibre
Channel
interfaces
Only virtual
Fibre
Channel
interfaces
32-7