Cisco UCS Manager CLI Configuration Guide, Release 1.4
Configuring System-Related Policies
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Configuring System-Related Policies

This chapter includes the following sections:

Configuring the Chassis Discovery Policy

Chassis Discovery Policy

The chassis discovery policy determines how the system reacts when you add a new chassis. Cisco UCS Manager uses the settings in the chassis discovery policy to determine the minimum threshold for the number of links between the chassis and the fabric interconnect. However, the configuration in the chassis discovery policy does not prevent you from connecting multiple chassis to the fabric interconnects in a Cisco UCS instance and wiring those chassis with a different number of links.

If you have a Cisco UCS instance that has some chassis wired with 1 link, some with 2 links, and some with 4 links, we recommend that you configure the chassis discovery policy for the minimum number links in the instance so that Cisco UCS Manager can discover all chassis. After the initial discovery, you must reacknowledge the chassis that are wired for a greater number of links and Cisco UCS Manager configures the chassis to use all available links.

Cisco UCS Manager cannot discover any chassis that is wired for fewer links than are configured in the chassis discovery policy. For example, if the chassis discovery policy is configured for 4 links, Cisco UCS Manager cannot discover any chassis that is wired for 1 link or 2 links. Reacknowledgement of the chassis does not resolve this issue.

The following table provides an overview of how the chassis discovery policy works in a multi-chassis Cisco UCS instance:



Table 1 Chassis Discovery Policy and Chassis Links
Number of Links Wired for the Chassis 1-Link Chassis Discovery Policy 2-Link Chassis Discovery Policy 4-Link Chassis Discovery Policy

1 link between IOM and fabric interconnects

Chassis is discovered by Cisco UCS Manager and added to the Cisco UCS instance as a chassis wired with 1 link.

Chassis cannot be discovered by Cisco UCS Manager and is not added to the Cisco UCS instance.

Chassis cannot be discovered by Cisco UCS Manager and is not added to the Cisco UCS instance.

2 links between IOM and fabric interconnects

Chassis is discovered by Cisco UCS Manager and added to the Cisco UCS instance as a chassis wired with 1 link.

After initial discovery, reacknowledge the chassis and Cisco UCS Manager recognizes and uses the additional links.

Chassis is discovered by Cisco UCS Manager and added to the Cisco UCS instance as a chassis wired with 2 link.

Chassis cannot be discovered by Cisco UCS Manager and is not added to the Cisco UCS instance.

4 links between IOM and fabric interconnects

Chassis is discovered by Cisco UCS Manager and added to the Cisco UCS instance as a chassis wired with 1 link.

After initial discovery, reacknowledge the chassis and Cisco UCS Manager recognizes and uses the additional links.

Chassis is discovered by Cisco UCS Manager and added to the Cisco UCS instance as a chassis wired with 2 links.

After initial discovery, reacknowledge the chassis and Cisco UCS Manager recognizes and uses the additional links.

Chassis is discovered by Cisco UCS Manager and added to the Cisco UCS instance as a chassis wired with 4 link.

Configuring the Chassis Discovery Policy

Procedure
     Command or ActionPurpose
    Step 1UCS-A# scope org /  

    Enters the root organization mode.

    Note   

    The chassis discovery policy can be accessed only from the root organization.

     
    Step 2UCS-A /org # scope chassis-disc-policy  

    Enters organization chassis discovery policy mode.

     
    Step 3UCS-A /org/chassis-disc-policy # set action {1-link | 2-link | 4-link}  

    Specifies the number of links to the fabric interconnect that the chassis must have before it can be discovered.

     
    Step 4UCS-A /org/chassis-disc-policy # set descr description   (Optional)

    Provides a description for the chassis discovery policy.

    Note   

    If your description includes spaces, special characters, or punctuation, you must begin and end your description with quotation marks. The quotation marks will not appear in the description field of any show command output.

     
    Step 5UCS-A /org/chassis-disc-policy # set qualifier qualifier   (Optional)

    Uses the specified server pool policy qualifications to associate this policy with a server pool.

     
    Step 6UCS-A /org/chassis-disc-policy # commit-buffer  

    Commits the transaction to the system configuration.

     

    The following example scopes to the default chassis discovery policy, sets it to discover chassis with four links to a fabric interconnect, provides a description for the policy, specifies the server pool policy qualifications that will be used to qualify the chassis, and commits the transaction: 

    UCS-A# scope org /
UCS-A /org # scope chassis-disc-policy
UCS-A /org/chassis-disc-policy* # set action 4-link
UCS-A /org/chassis-disc-policy* # set descr "This is an example chassis discovery policy."
UCS-A /org/chassis-disc-policy* # set qualifier ExampleQual
UCS-A /org/chassis-disc-policy* # commit-buffer
UCS-A /org/chassis-disc-policy #

    Configuring the Rack Server Discovery Policy

    Rack Server Discovery Policy

    The rack server discovery policy determines how the system reacts when you add a new rack-mount server. Cisco UCS Manager uses the settings in the rack server discovery policy to determine whether any data on the hard disks are scrubbed and whether server discovery occurs immediately or needs to wait for explicit user acknowledgement.

    Cisco UCS Manager cannot discover any rack-mount server that has not been correctly cabled and connected to the fabric interconnects. For information about how to integrate a supported Cisco UCS rack-mount server with Cisco UCS Manager, see the hardware installation guide for that server.

    Configuring the Rack Server Discovery Policy

    Procedure
       Command or ActionPurpose
      Step 1UCS-A# scope org /  

      Enters the root organization mode.

      Note   

      The rack server discovery policy can be accessed only from the root organization.

       
      Step 2UCS-A /org # scope rackserver-disc-policy  

      Enters organization rack server discovery policy mode.

       
      Step 3UCS-A /org/rackserver-disc-policy # set action {immediate | user-acknowledged}  

      Specifies the way the system reacts when you add a new rack server.

       
      Step 4UCS-A /org/rackserver-disc-policy # set descr description   (Optional)

      Provides a description for the rack server discovery policy.

      Note   

      If your description includes spaces, special characters, or punctuation, you must begin and end your description with quotation marks. The quotation marks will not appear in the description field of any show command output.

       
      Step 5UCS-A /org/rackserver-disc-policy # set scrub-policy scrub-pol-name  

      Specifies the scrub policy that should run on a newly discovered rack server.

       
      Step 6UCS-A /org/rackserver-disc-policy # commit-buffer  

      Commits the transaction to the system configuration.

       

      The following example scopes to the default rack server discovery policy, sets it to immediately discover new rack servers, provides a description for the policy, specifies a scrub policy called scrubpol1, and commits the transaction: 

      UCS-A# scope org /
UCS-A /org # scope rackserver-disc-policy
UCS-A /org/rackserver-disc-policy* # set action immediate
UCS-A /org/rackserver-disc-policy* # set descr "This is an example rackserver discovery policy."
UCS-A /org/rackserver-disc-policy* # set scrub-policy scrubpol1
UCS-A /org/rackserver-disc-policy* # commit-buffer
UCS-A /org/rackserver-disc-policy #

      Configuring the Aging Time for the MAC Address Table

      Aging Time for the MAC Address Table

      To efficiently switch packets between ports, the fabric interconnect maintains a MAC address table. It dynamically builds the MAC address table by using the MAC source address from the packets received and the associated port on which the packets were learned. The fabric interconnect uses an aging mechanism, defined by a configurable aging timer, to determine how long an entry remains in the MAC address table. If an address remains inactive for a specified number of seconds, it is removed from the MAC address table.

      You can configure the amount of time (age) that a MAC address entry (MAC address and associated port) remains in the MAC address table.

      Configuring the Aging Time for the MAC Address Table

      Procedure
         Command or ActionPurpose
        Step 1UCS-A# scope eth-uplink  

        Enters Ethernet uplink mode.

         
        Step 2UCS-A /eth-uplink # set mac-aging {dd hh mm ss | mode-default | never} 

        Specifies the aging time for the MAC address table. Use the mode-default keyword to set the aging time to a default value dependent on the configured Ethernet switching mode. Use the never keyword to never remove MAC addresses from the table regardless of how long they have been idle.

         
        Step 3UCS-A /eth-uplink # commit-buffer  

        Commits the transaction to the system configuration.

         

        The following example sets the aging time for the MAC address table to one day and 12 hours and commits the transaction:

        UCS-A# scope eth-uplink
UCS-A /eth-uplink # set mac-aging 01 12 00 00
UCS-A /eth-uplink* # commit-buffer
UCS-A /eth-uplink #