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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 |
---|---|---|---|
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 Power Policy
The power policy is a global policy that specifies the redundancy for power supplies in all chassis in the Cisco UCS instance. This policy is also known as the PSU policy.
For more information about power supply redundancy, see Cisco UCS 5108 Server Chassis Hardware Installation Guide.
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.