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How to discover the chassis using Cisco UCS Manager ?

Once you have done the Cabling and Fabric Interconnect’s cluster configuration, the next step would be to configuring the polices and configure ports to perform the chassis discovery.  In this article,we will see that how we can configure the equipment policies and discovery the chassis. Once the chassis is discovered , you can see the chassis components like server modules , IO adapters in the UCS manager’s  Equipments tab.

Configuring the Equipment policy:

1. Here the assumption is that we have only two connections from each IOM to FI’s.

Chassis to FI Connectivity
Chassis to FI Connectivity


2. Login to UCS manager .

3. Select Equipment – >  Policies   – > Global policies .

Equipment Policy
Equipment Policy


In Chassis/FEX discover policy tab,

“Action:” dropdown should be set to the amount of links that are connected between an individual IOM and Fabric Interconnect pair. For instance, in the drawing displayed earlier each IOM had two connections to its associated Fabric Interconnect. Thus, a “2 link” policy should be created. This policy is essentially just specifying how many connections need to be present for a chassis to be discovered.  There is no harm if you use default link value (1) , but setting the actual “No of Links” will help you identify the bad links between FEX/IOM to FI.

In Power Policy tab,

For environments with redundant power sources/PDUs, “Grid” should be specified for a power policy. If one  source fails (which causes a loss of power to one or two power supplies), the surviving power supplies on the other power circuit continue to provide power to the chassis. Both grids in a power redundant system should have the same number of power supplies. Slots 1 and 2 are assigned to grid 1 and slots 3 and 4 are assigned to grid 2.



Configuring Ports:

1. Navigate to the “Equipment” tab  – > Fabric Interconnects – > Fabric Interconnect A/B . Then expand any Fixed or Expansion modules as necessary.  Configure the appropriate un-configured ports as “Server” . The best practice is to configure the ports from middle or last of the FI. The ports which you are configuring be will act as FCoE and remaining ports also will be configured as FCoE .

Configure the port from Right to Left
Configure the port from Right to Left


Note: You have to do the cabling accordingly from IOM to FI. For an example ,if you have connected to the port number 11 and 12 ports from FI-A  to IOM – A  & 11 and 12 ports from FI-B to IOM – B , you need to configure only those ports.


Configure the FI ports
Configure the FI ports


2. Right click the port and configure as “server port” for each port that you have connected with IOM (Chassis.)

Right port and configure as server port
Right port and configure as server port


3. After configuring the server ports on Fabric interconnect A , you can see the link status like below. (Green link on the FI).

Configured the server ports on FI-A
Configured the server ports on FI-A


4. Same way you need to configure the ports on fabric interconnect -B .

Configure the ports on FI-B
Configure the ports on FI-B


Once you have configured the ports , chassis will be discovered and it will be listed under the equipment tab.  In the above screenshot, you can see that chassis 1 has been discovered.

Acknowledging a Chassis:  

You need to acknowledge the chassis, if you increase or decrease the number of links that connect the chassis to the fabric interconnect. Acknowledging the chassis will ensures that Fabric interconnect  is aware of the change in the number of links and that traffics flows along all available links.After you enable or disable a port on a fabric interconnect, wait for at least 1 minute before you reacknowledge the chassis. If you re-acknowledge the chassis too soon, the pinning of server traffic from the chassis may not be updated with the changes to the port that you enabled or disabled.


Step 1 In the Navigation pane, click the Equipment tab.
Step 2 On the Equipment tab, expand Equipment > Chassis.
Step 3 Choose the chassis that you want to acknowledge.
Step 4 In the Work pane, click the General tab.
Step 5 In the Actions area, click Acknowledge Chassis.
Step 6 If Cisco UCS Manager displays a confirmation dialog box, click Yes.Cisco UCS Manager disconnects the chassis and then rebuilds the connections between the chassis and the fabric interconnect or fabric interconnects in the system.

Refer: Cisco Product Guide for more information.


Hope this article is informative to you.


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