Cisco UCS 5100 Manual

Set up FCoE Connectivity for a Cisco UCS Blade
Document ID: 110434
Contents
Introduction
Prerequisites
Requirements
Components Used
Network Diagram
Conventions
Background Information
Main Task
Task
1. Verify that Cisco UCS Fabric Interconnect Supports FCoE Feature
2. Identify Fiber Channel components and Connectivity in Cisco UCS
3. Create VSAN to Support FCoE for FC Uplink
4.1 Assign VSAN to FC Uplink Port in Fabric Interconnect
4.2 Assign VSAN to FC Uplink Port in Fabric Interconnect (Alternate Method)
5. Create vHBA within Server Profiles
Verify
Troubleshoot
Related Information
Introduction
Cisco Unified Computing System (UCS) is a unified computing solution that fuses access layer networking
and servers. This high−performance, next−generation server system provides the data center with a high
degree of workload agility and scalability.
The hardware and software components in the UCS support the unified fabric of Cisco, which allows multiple
types of data center traffic over a single physical Ethernet network. This Data Center Ethernet (DCE)
technology reduces the amount of cabling, management, and cost with the combination of the host bus
adapters (HBAs) and network interface cards (NICs) into a single adapter called the Converged Network
Adapter (CNA). This adapter can carry LAN and SAN traffic on the same cable.
Cisco UCS uses Fibre Channel over Ethernet (FCoE) protocol to carry Fibre Channel (FC) traffic inside
Ethernet frame. Cisco UCS also adheres to multiple 802.1 standards to provide the DCE underlying the FCoE
needs to effectively transport those frames. The fabric interconnect separates the LAN and SAN traffic from
the Ethernet frames and forwards them to the appropriate network ports. This gives the flexibility to deploy
this technology without the need of implementing the unified fabric solution across the entire data center
network.
Cisco UCS blade installed with Cisco UCS CNA M71KR  E Emulex Converged Network Adapter or Cisco
UCS CNA M71KR  Q QLogic Converged Network Adapter can handle both FC and IP simultaneously. The
converged network adapter presents an Ethernet interface and an Fibre Channel interface to the operating
system. The OS is completely unaware of the encapsulation taking place in the Ethernet segment. The only
requirement is for the OS to have the appropriate drivers to recognize the CNA hardware.
At the fabric interconnect, the server−facing Ethernet port receives the Ethernet and Fibre Channel traffic. The
fabric interconnect (which uses Ethertype to differentiate the frames) separates the two traffic types. Ethernet

frames and Fibre Channel frames are switched to their respective uplink interfaces.
This document illustrates all the necessary steps to properly configure FCoE connectivity for a Cisco UCS
blade using either of the CNA's.
Prerequisites
Requirements
Cisco recommends that you:
Have a working knowledge of Cisco UCS Server Blade software and hardware.• Be familiar with the UCS Manager GUI.• Have a UCS system that runs version 1.0(1e) or later• Understand the impact and implications of the different commands described in this document• Be familiar with the UCS components and topology. Refer to the diagram for a typical solution.•
Ensure that you meet these requirements before you attempt this configuration:
Components Used
The information in this document is based on these software and hardware versions:
Cisco UCS System• Adaptor Cards required to support FCoE: the Cisco UCS CNA M71KR  E Emulex Converged
Network Adapter or the Cisco UCS CNA M71KR  Q QLogic Converged Network Adapter
•
The information in this document was created from the devices in a specific lab environment. All of the
devices used in this document started with a default configuration. If your network is live, make sure that you
understand the potential impact of any command.
Network Diagram
This is a typical topology used with the Cisco UCS:
This is the network diagram used in this test plan:

Conventions
Refer to the Cisco Technical Tips Conventions for more information on document conventions.
Background Information
The Cisco UCS follows the FCoE protocol as defined by the ANSI T11 Standards Committee. The FC traffic
encapsulated inside this Ethernet requires the same lossless network characteristics that are found in a fabric
network. Instead of the buffer−to−buffer (B2B) credit system used in native fabric topologies, the FCoE relies
on a new set of Ethernet standards that were develop to enhance the Ethernet protocol to ensure lossless
transport of the FCoE traffic.
The Ethernet links on the system support these Ethernet enhancements to ensure lossless transport for the
FCoE traffic:
Priority Flow Control (PFC) IEEE 802.1Qbb is an extension of the PAUSE (802.3x) mechanism. PFC
creates eight virtual links in each physical link and allows any of these links to be paused individually
without affecting the flow of traffic in the other links.
•
Enhanced Transmission Selection (ETS) IEEE 802.1Qaz is a scheduling mechanism in hardware that•

allows a two−level Deficit Weighted Round Robin (DWRR) with strict priority support. This allows
control not only of bandwidth, but also of latency.
Data Center Bridge eXchange (DCBX) is a discovery and capability exchange protocol to verify that
both ends are configured properly to support the DCE traffic. It can provide basic configuration if one
of the two sides is not configured properly.
•
The fabric interconnect operates in N−Port Virtualization (NPV) mode and not as a FC switch in the fabric.
This means that it does not require a FC domain ID to keep the number of domain IDs in the SAN fabric the
same. The fabric interconnect joins the fabric through a normal FLOGI. The FLOGIs that comes from the
server blade adapters is translated by the NPV process into FDISC into the fabric.
Main Task
Task
Before you begin, make sure that your upstream MDS switches are NPIV enabled, and assign the selected
interface to the Cisco UCS with the appropriate VSAN number.
The Cisco UCS must be up and operational by now and have basic connectivity established.
1. Verify that Cisco UCS Fabric Interconnect Supports FCoE Feature
The Fabric Interconnect must be set in order to operate in FCoE mode. Connect to the Fabric Interconnect and
connect to nxos mode in order to verify this:
! Log into UCS Manager CLI mode
! Connect to "nxos" mode
cali−spring−A# connect nxos
Cisco UCS 6100 Series Fabric Interconnect
TAC support: http://www.cisco.com/tac
Copyright ©) 2009, Cisco Systems, Inc. All rights reserved.
The copyrights to certain works contained herein are owned by
other third parties and are used and distributed under license.
Some parts of this software may be covered under the GNU Public
License or the GNU Lesser General Public License. A copy of
each such license is available at
http://www.gnu.org/licenses/gpl.html and
http://www.gnu.org/licenses/lgpl.html
! Make sure FCoE is supported on the switch,
by issuing "show fcoe"
cali−spring−A# show fcoe
FCoE/FC feature is desired.

Type exit to disconnect from nxos
Display of inventory will also show install of FC Modules into the switches
! exit from "nxos" mode to switch mode,
and making sure you are seeing the FC module
cae−sj−ca−B# show fabric−interconnect inventory expand
Switch A:
Switch Card:
Slot Description Num Ports State PID Serial (SN)
−−−−− −−−−−−−−−−−−−−−−−−−− −−−−−−−−−− −−−−−−−−−− −−−−−−−−−−−−−−− −−−−−−−−−−−
1 20x10GE/Supervisor 20 Online N10−S6100 JAF1242ASGK
2 8x1/2/4G FC Module 8 Online N10−E0080 JAB123800NM
2. Identify Fiber Channel components and Connectivity in Cisco UCS
Before you configure the fabric interconnect to support VSAN, you need to make sure that your FC uplink
expansion works and is visible from the fabric interconnect. Complete these steps:
Log into UCS Manager GUI mode.1. In the Navigation pane, choose Equipment.2. Choose Fabric Interconnect > Fabric Interconnect #.3. Choose Uplink FC Ports.4.

3. Create VSAN to Support FCoE for FC Uplink
The FC port defaults to VSAN 1 in Cisco UCS, but, if the upstream Fibre Channel switch is connected to a
different VSAN #, the proper VSAN configuration is required on the FC ports of the Fabric Interconnect.
Complete these steps:
In the Navigation pane, choose SAN.1. Choose SAN Cloud.2. Choose the FC Uplinks for the fabric in question (A or B).3. Right−click VSANs in the FC Uplinks of the Fabric # where you want to create the VSAN for
Uplink.
4.
In the Create VSAN wizard, enter a name for this new VSAN. In this example, it is called vsan−100.5. Now enter the VSAN ID. Remember that this has to match to an existent VSAN ID in the fabric to
which the UCS connects. In this example, VSAN 100 is used for fabric A and VSAN 200 for fabric
B.
6.
Now enter the FCoE VLAN that maps to the VSAN configured in this fabric. Remember that this
VLAN has to match to an existent VLAN in the LAN network. Click OK.
7.

Click the VSAN name you created in order to display your results.
Now, repeat the same process for the uplink of Fabric B, except with VSAN 200 and VLAN 200 for
Fabric B, you get this result:
8.

4.1 Assign VSAN to FC Uplink Port in Fabric Interconnect
Now assign the VSAN you just created to the FC Uplink port in your Fabric Interconnect that has a direct link
to your SAN network. Complete these steps:
In the Navigation pane, choose the Equipment tab.1. Choose Fabric Interconnect A > Expansion Module #.2. Choose Uplink FC Ports and choose the FC Port 1 that has a connection to the upstream SAN
switch.
3.
In the Work pane to the right in VSAN, choose the VSAN you just created from the drop−down
menu.
4.
Click Save Changes.
Repeat the same process to assign this VSAN to all the designated FC Up link ports that remain on
this same Fabric Interconnect.
5.

In order to configure the second fabric, repeat steps 2 through 5. Cisco recommends that you use a
different VSAN and a different FCoE VLAN to keep your fabrics separated. In this example, VSAN
ID 200 and FCoE VLAN 200 were used.
6.

4.2 Assign VSAN to FC Uplink Port in Fabric Interconnect (Alternate
Method)
Choose the FC port linked to your SAN network and assign this port to the VSAN created in the previous
step.
These FC Uplinks must already be provisioned with respective VSAN IDs on the SAN network side (MDS
switch).
In the Navigation pane, choose the SAN tab.1. Expand SAN Cloud and then expand FC Uplinks − Fabric A.2. Expand Uplink FC Ports. In this test case, choose FC Port 2/1 that has connection to the upstream
SAN switch.
3.
Either right−click the desired FC port, or, in the Work pane to the right, click the port as shown.4.
In the Properties pop−up window for FC Port 1, choose the VSAN to which this FC port will pinned
from the drop−down menu.
5.
Click OK.6.