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The total number of uplink Ethernet ports and uplink Ethernet port channel members that can be configured
on each fabric interconnect is limited to 31. This limitation includes uplink Ethernet ports and uplink
Ethernet port channel members configured on the expansion module.
Note
Effect of Port Mode Changes on Data Traffic
Port mode changes can cause an interruption to the data traffic for the Cisco UCS domain. The length of the
interruption and the traffic that is affected depend upon the configuration of the Cisco UCS domain and the
module on which you made the port mode changes.
To minimize the traffic disruption during system changes, form a Fibre Channel uplink port-channel across
the fixed and expansion modules.
Tip
Impact of Port Mode Changes on an Expansion Module
After you make port mode changes on an expansion module, the module reboots. All traffic through ports on
the expansion module is interrupted for approximately one minute while the module reboots.
Impact of Port Mode Changes on the Fixed Module in a Cluster Configuration
A cluster configuration has two fabric interconnects. After you make port changes to the fixed module, the
fabric interconnect reboots. The impact on the data traffic depends upon whether or not you have configured
the server vNICs to failover to the other fabric interconnect when one fails.
If you change the port modes on the expansion module of one fabric interconnect and then wait for that to
reboot before changing the port modes on the second fabric interconnect, the following occurs:
• With server vNIC failover, traffic fails over to the other fabric interconnect and no interruption occurs.
• Without server vNIC failover, all data traffic through the fabric interconnect on which you changed the
port modes is interrupted for approximately eight minutes while the fabric interconnect reboots.
However, if you change the port modes on the fixed modules of both fabric interconnects simultaneously, all
data traffic through the fabric interconnects are interrupted for approximately eight minutes while the fabric
interconnects reboot.
Impact of Port Mode Changes on the Fixed Module in a Standalone Configuration
A standalone configuration has only one fabric interconnect. After you make port changes to the fixed module,
the fabric interconnect reboots. All data traffic through the fabric interconnect is interrupted for approximately
eight minutes while the fabric interconnect reboots.
Cisco UCS Manager GUI Configuration Guide, Release 2.0
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Unified Ports on the 6200 Series Fabric Interconnect