Npv Traffic Management; Automatic Uplink Selection; Traffic Maps - Cisco Nexus 5000 Series Configuration Manual

Information About NPV
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.
Related Topics
Information About Zones, on page 131

NPV Traffic Management

Automatic Uplink Selection

NPV supports automatic selection of NP uplinks. When a server interface is brought up, the NP uplink interface
with the minimum load is selected from the available NP uplinks in the same VSAN as the server interface.
When a new NP uplink interface becomes operational, the existing load is not redistributed automatically to
include the newly available uplink. Server interfaces that become operational after the NP uplink can select
the new NP uplink.

Traffic Maps

In Release 4.0(1a)N2(1) and later software releases, NPV supports traffic maps. A traffic map allows you to
specify the NP uplinks that a server interface can use to connect to the core switches.
Note When an NPV traffic map is configured for a server interface, the server interface must select only from
the NP uplinks in its traffic map. If none of the specified NP uplinks are operational, the server remains
in a non-operational state.
The NPV traffic map feature provides the following benefits:
• Facilitates traffic engineering by allowing configuration of a fixed set of NP uplinks for a specific server
interface (or range of server interfaces).
• Ensures correct operation of the persistent FC ID feature, because a server interface will always connect
to the same NP uplink (or one of a specified set of NP uplinks) after an interface reinitialization or switch
reboot.
Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide, Release 5.2(1)N1(1)
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Configuring N Port Virtualization
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