Chassis Discovery Policy
The chassis discovery policy determines how the system reacts when you add a new Cisco UCS S3260 chassis or an existing standalone Cisco UCS S3260 chassis to a Cisco UCS system. Cisco UCS S3260 System Architectural Overview describes the connectivity for a Cisco UCS S3260 system managed by Cisco UCS Manager. Cisco UCS Manager uses the settings in the chassis discovery policy to determine whether to group links from the system I/O controllers (SIOCs) to the fabric interconnects in fabric port channels.
To add a previously standalone Cisco UCS S3260 chassis to a Cisco UCS system, you must first configure it to factory default. You can then connect both SIOCs on the chassis to both fabric interconnects. After you connect the SIOCs on the chassis to the fabric interconnects, and mark the ports as server ports, chassis discovery begins.
Cisco UCS Manager automatically discovers the Cisco UCS S3260 server nodes after the Cisco UCS S3260 chassis is discovered.
Server discovery fails if the SIOC corresponding to the server is not present.
When you connect a Cisco UCS S3260 chassis through a FEX to a Cisco UCS 6200 Series fabric interconnect or directly to a Cisco UCS 6300 Series fabric interconnect, Cisco UCS Manager ignores the Port Channel preference and the SIOCs operate in the non-port channel mode.
When you connect a Cisco UCS S3260 chassis directly to a Cisco UCS 6200 Series fabric interconnect, you can use link grouping to determine whether all of the links from the SIOC to the fabric interconnect are grouped into a fabric port channel during chassis discovery. If the link grouping preference is set to Port Channel, all of the links from the SIOC to the fabric interconnect are grouped in a fabric port channel. If set to None, links from the SIOC are pinned to the fabric interconnect.
Set the link grouping preference to Port Channel if the Cisco UCS S3260 chassis is connected to a Cisco UCS 6200 Series fabric interconnect through a 4x10G breakout cable. If this is not done, chassis discovery will not complete.
Set the link grouping preference to None if the Cisco UCS S3260 chassis is connected to a fabric interconnect through a single 10G cable.
After changing the Link Group Preference value in the Cisco UCS Manager GUI, Decommission and then Recommission the Cisco UCS S3260 chassis for the change to take effect.
In the Cisco UCS domain, if there are other chassis operating in Port Channel mode, do the following:
Discover the chassis in the Cisco UCS system with the Link Group Preference set to Port Channel
Change the link aggregation preference for the Cisco UCS S3260 chassis through Chassis Connectivity Policy
Decommission the chassis
Recommission the chassis
Configuring the Chassis/FEX Discovery Policy
In the Navigation pane, click Equipment.
Click the Equipment node.
In the Work pane, click the Policies tab.
Click the Global Policies subtab.
In the Chassis/FEX Discovery Policy area, specify the action and the link grouping preference.
Click Save Changes.
What to do next
To customize fabric port channel connectivity for a specific chassis, configure the chassis connectivity policy.