Users Guide

Servers use CNA ports to connect over FCoE to an Ethernet port in ENode mode on the NPIV proxy gateway.
FCoE transit with FIP snooping is automatically enabled and configured on the S5000 gateway to prevent
unauthorized access and data transmission to the SAN network (see FCoE Transit). Server CNAs use FIP to
discover an S5000 FCoE switch operating as an FCoE forwarder (FCF).
The NPIV proxy gateway aggregates multiple locally connected server CNA ports into one or more upstream
N port links, conserving the number of ports required on an upstream FC core switch while providing an
FCoE-to-FC bridging functionality. The upstream N ports on an S5000 can connect to the same or multiple
fabrics.
Using an FCoE map applied to downstream (server-facing) Ethernet ports and upstream (fabric-facing) FC
ports, you can configure the association between a SAN fabric and the FCoE VLAN that connects servers over
the NPIV proxy gateway to FC switches in the fabric. An FCoE map virtualizes the upstream SAN fabric as an
FCF to downstream CNA ports on FCoE-enabled servers as follows:
• As soon as an FC N port comes online (the no shutdown command), the NPG starts sending FIP
multicast advertisements, which contain the fabric name derived from the 64-bit worldwide name
(WWN) of the principal SAN switch. (The principal switch in a fabric is the FC switch with the lowest
domain ID.)
• When you apply the FCoE map to a server-facing Ethernet port in ENode mode, ACLs are automatically
configured to allow only FCoE traffic from servers that perform a successful FLOGI on the FC switch. All
other traffic on the VLAN is denied.
You can specify one or more upstream N ports in an FCoE map. The FCoE map also contains the VLAN ID of
the dedicated VLAN used to transmit FCoE traffic between the SAN fabric and servers.
NPIV Proxy Gateway: Protocol Services
An S5000 NPG provides the following protocol services.
• Fibre Channel service to create N ports and log in to an upstream FC switch.
• FCoE service to perform:
• Virtualization of FC N ports on an NPG so that they appear as FCoE FCFs to downstream servers.
• NPIV service to perform the association and aggregation of FCoE servers to upstream F ports on
core switches (through N ports on the NPG). Conversion of server FLOGIs and FDISCs, which are
received over S5000 ENode ports, are converted into FDISCs addressed to the upstream F ports on
core switches.
NPIV Proxy Gateway Functionality
An NPG provides the following functionality in a storage area network.
• FIP snooping bridge that provides security for FCoE traffic using ACLs (refer to FCoE Transit chapter).
• FCoE gateway that provides FCoE-to-FC bridging. N-port virtualization using FCoE maps exposes
upstream F ports as FCF ports to downstream server-facing ENode ports on the NPG (refer FCoE Maps).
NPIV Proxy Gateway 703