Справочник Пользователя для IBM Flex System V7000 Expansion Enclosure 4939H29

Chapter 11. SAN Connections and Configuration 

Draft Document for Review January 29, 2013 12:52 pm

undesirable FCoE or FIP traffic. The CN4093 provides FIP snooping function allows the 
compute node to log in establishing the VN_Port to VF_Port virtual link. 

For more information about FIP, see the FC-BB-5 standard at:

End devices such as the compute nodes (ENodes in the FC-BB-5 standard) use virtual MAC 
addresses for their VN_Ports. The FC-BB-5 standard allows these MAC addresses to be 
assigned by the FCF during login or by the ENode. MAC addresses assigned by FCFs are 
called 

 (FPMAs). MAC addresses assigned by the end 

devices are called 

 (SPMAs). The CNAs and FCFs today 

implement only FPMAs hence this is provided by the IBM Flex System Enterprise Chassis I/O 
module switch such as the IBM Flex System Fabric EN4093 10Gb Scalable Switch. 

As mentioned previously, a Fibre Channel Forwarder is the FC switching element in an FCoE 
network. One of the characteristics of an FC switching element is that it joins the FC fabric as 
a domain. This will give it the CN4093 capability of switching data between the compute node 
using FCoE and an external storage controller attached to external FC SAN fabric. It will also 
provide connectivity to external FCoE but does not support E-port attachment to switches.

In a mixed FC-FCoE fabric, the FCF also often acts as the conversion device between FC and 
FCoE. Each FCF that operates in full-fabric mode or switch mode as an FC switch joins the 
existing FC fabric as a domain. If the CN4093 is not used in this mode and becomes a 
gateway device to an external FC or FCoE SAN then N_Port ID Virtualization (NPIV) would 
be employed. NPIV is discussed in detail in “N_Port ID Virtualization” on page 470 where 
where connections involving NPIV equally apply to FCoE as they do in FC connectivity.

This section is specific to IBM Flex System Fabric CN4093 10Gb Converged Scalable Switch 
I/O module as it has both FC and FCoE capability. There are other I/O module 10Gb Ethernet 
switches which can be used for FCoE, such as IBM Flex System Fabric EN4093 10Gb 
Scalable Switch. To Configure FCoE on IBM Flex System Fabric CN4093 10Gb Converged 
Scalable Switch for connectivity to IBM Flex System V7000 Storage Node, it is necessary to 
understand the different ports and functions within the switch. 

As previously mentioned the CN4093 has FC and FCoE functionality, the physical ports 
comprise of internal and external types. The internal ports connect the IBM Flex System 
Enterprise Chassis node bays as shown in Figure 11-1 on page 434. The IBM Flex System 
V7000 Storage Node uses these internal ports to connect to the IBM Flex System Fabric 
CN4093 10Gb Converged Scalable Switch. The IBM Omni external ports can be attached via 
cable to external LAN/SAN network equipment depending whether they are configured for 
Ethernet or FC mode. 

Table 11-2 on page 448 details the different types of ports in the IBM Flex System Fabric 
CN4093 10Gb Converged Scalable Switch.