Flogi Operation - Cisco Nexus 5000 Series Configuration Manual

Configuring N Port Virtualization
An NP uplink is a connection from an NP port on the edge switch to an F port on the core switch. When an
NP uplink is established, the edge switch sends a fabric login message (FLOGI) to the core switch, and then
(if the FLOGI is successful) it registers itself with the name server on the core switch. Subsequent FLOGIs
from end devices connected to this NP uplink are converted to fabric discovery messages (FDISCs).
Note In the switch CLI configuration commands and output displays, NP uplinks are called External Interfaces.
In Cisco Nexus 5000 Series switches, NP uplink interfaces must be native Fibre Channel interfaces.

FLOGI Operation

When an NP port becomes operational, the switch first logs itself in to the core switch by sending a FLOGI
request (using the port WWN of the NP port).
After completing the FLOGI request, the switch registers itself with the fabric name server on the core switch
(using the symbolic port name of the NP port and the IP address of the edge switch).
The following table identifies port and node names in the edge switch used in NPV mode.
Table 11: Edge Switch FLOGI Parameters
Parameter
pWWN
nWWN
symbolic port name
IP address
symbolic node name
The buffer-to-buffer state change number (BB_SCN) of internal FLOGIs on an NP port is always set to
Note
zero. The BB_SCN is supported by the F port on the edge switch.
We do not recommend using fWWN-based zoning on the edge switch for the following reasons:
• Zoning is not enforced at the edge switch (rather, it is enforced on the core switch).
• Multiple devices attached to an edge switch log in through the same F port on the core, so they cannot
be separated into different zones.
• The same device might log in using different fWWNs on the core switch (depending on the NPV link
it uses) and may need to be zoned using different fWWNs.
OL-xxxxx-xx
Derived From
The fWWN of the NP port on the edge switch.
The VSAN-based sWWN of the edge switch.
The edge switch name and NP port interface string.
Note If no switch name is available, the output
will read "switch." For example, switch: fc
1/5.
The IP address of the edge switch.
The edge switch name.
Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide
Information About NPV
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