Cisco Nexus 5000 Series - Buffer-To-Buffer Credits

Applicable ModesDescriptionReason Code (long version)
The assigned domain ID is not
valid.
Isolation due to domain ID
assignment failure
The E port at the other end of the
link is isolated.
Isolation due to the other side of
the link E port isolated
The port is isolated due to fabric
reconfiguration.
Isolation due to invalid fabric
reconfiguration
The fcdomain feature is disabled.Isolation due to domain manager
disabled
The zone merge operation failed.Isolation due to zone merge failure
The VSANs at both ends of an ISL
are different.
Isolation due to VSAN mismatch
Only SAN port channel interfacesThe interfaces belonging to the
SAN port channel are down.
port channel administratively down
The interfaces belonging to the
SAN port channel have
incompatible speeds.
Suspended due to incompatible
speed
The interfaces belonging to the
SAN port channel have
incompatible modes.
Suspended due to incompatible
mode
An improper connection is
detected. All interfaces in a SAN
port channel must be connected to
the same pair of switches.
Suspended due to incompatible
remote switch WWN
Only virtual Fibre Channel
interfaces
The Ethernet interface bound to a
virtual Fibre Channel interface is
not operational.
Bound physical interface down
Only virtual Fibre Channel
interfaces
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
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.
Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide, Release 5.2(1)N1(1)
OL-27583-01 15
Configuring Fibre Channel Interfaces
Information About Fibre Channel Interfaces