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Cabling Considerations for Fabric Port Channels
When you configure the links between the Cisco UCS 2200 Series IOM and a Cisco UCS 6200 series fabric
interconnect in fabric port channel mode, the available VIF namespace on the adapter varies depending on
where the IOM uplinks are connected to the fabric interconnect ports.
Inside the 6248 fabric interconnect there are six sets of eight contiguous ports, with each set of ports managed
by a single chip. When uplinks are connected such that all of the uplinks from an IOM are connected to a set
of ports managed by asingle chip,Cisco UCS Managermaximizes the numberof VIFsused inservice profiles
deployed on the blades in the chassis. If uplink connections from an IOM are distributed across ports managed
by separate chips, the VIF count is decreased.
Figure 1: Port Groups for Fabric Port Channels
Adding or removing links from a fabric port channel is disruptive and may affect the available amount of
VIF namespace.
Caution
For high availability cluster mode applications, symmetric cabling configurations are strongly recommended.
If the cabling is asymmetric, the maximum number of VIFs available is the smaller of the two cabling
configurations.
For more information on the maximum number of VIFs for your Cisco UCS environment, see the configuration
limits document for your for your hardware and software configuration.
Configuring a Fabric Port Channel
Procedure
Step 1
To include all links from the IOM to the fabric interconnect in a fabric port channel during chassis discovery,
set the link grouping preference in the chassis discovery policy to port channel.
Configuring the Chassis Discovery Policy, on page 242
Step 2
To include links from individual chassis in a fabric port channel during chassis discovery, set the link grouping
preference in the chassis connectivity policy to port channel.
Configuring a Chassis Connectivity Policy, on page 243
Step 3
After chassis discovery, enable or disable additional fabric port channel member ports.
Enabling or Disabling a Fabric Port Channel Member Port, on page 110
Cisco UCS Manager GUI Configuration Guide, Release 2.0
OL-25712-04 109
Fabric Port Channels