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This chapter includes the following sections:
Configuring the 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.
Number of Links Wired for the Chassis | 1-Link Chassis Discovery Policy | 2-Link Chassis Discovery Policy | 4-Link Chassis Discovery Policy |
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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. |
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
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.
Command or Action | Purpose | |||
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Step 1 | UCS-A# scope org / | Enters the root organization mode.
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Step 2 | UCS-A /org # scope rackserver-disc-policy | Enters organization rack server discovery policy mode. |
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Step 3 | UCS-A /org/rackserver-disc-policy # set action {immediate | user-acknowledged} | Specifies the way the system reacts when you add a new rack server. |
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Step 4 | UCS-A /org/rackserver-disc-policy # set descr description | (Optional) Provides a description for the rack server discovery policy.
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Step 5 | UCS-A /org/rackserver-disc-policy # set scrub-policy scrub-pol-name | Specifies the scrub policy that should run on a newly discovered rack server. |
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Step 6 | UCS-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
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.
Command or Action | Purpose | |
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Step 1 | UCS-A# scope eth-uplink | Enters Ethernet uplink mode. |
Step 2 | UCS-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 3 | UCS-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 #