22.05.2017 Views

nx.os.and.cisco.nexus.switching.2nd.edition.1587143046

Nexus Switching 2nd Edition

Nexus Switching 2nd Edition

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Figure 8-3. FcoE Frame Format<br />

FCoE st<strong>and</strong>ards also define several new port types:<br />

• Virtual N_Port (VN_Port): An N_Port that operates over an Ethernet link. N_Ports,<br />

also referred to as Node Ports, are the ports on h<strong>os</strong>ts or storage arrays used to connect<br />

to the FC fabric.<br />

• Virtual F_Port (VF_Port): An F_port that operates over an Ethernet link. F_Ports<br />

are switch or director ports that connect to a node.<br />

• Virtual E_Port (VE_Port): An E_Port that operates over an Ethernet link. E_Ports or<br />

Expansion ports are used to connect Fibre Channel switches together; when two<br />

E_Ports are connected the link, it is an interswitch link (ISL).<br />

To facilitate using FCoE an additional control plane protocol was needed <strong>and</strong> thus FCoE<br />

Initialization Protocol (FIP) was developed. FIP helps the FCoE perform VLAN discovery,<br />

assists the device in login (FLOGI) to the fabric, <strong>and</strong> finds key resources such as Fibre<br />

Channel Forwarders (FCFs). FIP is its own Ethertype (0x8914), which makes it easier to<br />

identify on a network <strong>and</strong> helps FIP Snooping devices identify FCoE traffic. Figure 8-4<br />

depicts where FIP starts <strong>and</strong> ends <strong>and</strong> where FCoE takes over.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!