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denying egress server traffic on more than one uplink port at a time. End-host mode is the default Ethernet
switching mode and should be used if either of the following are used upstream:
• Layer 2 switching for L2 aggregation
• Virtual Switching System (VSS) aggregation layer
When end-host mode is enabled, if a vNIC is hard pinned to an uplink port and this uplink port goes down,
the system cannot re-pin the vNIC, and the vNIC remains down.
Note
Switch Mode
Switch mode is the traditional Ethernet switching mode. The fabric interconnect runs STP to avoid loops, and
broadcast and multicast packets are handled in the traditional way. Switch mode is not the default Ethernet
switching mode, and should be used only if the fabric interconnect is directly connected to a router, or if either
of the following are used upstream:
• Layer 3 aggregation
• VLAN in a box
For both Ethernet switching modes, even when vNICs are hard pinned to uplink ports, all server-to-server
unicast traffic in the server array is sent only through the fabric interconnect and is never sent through
uplink ports. Server-to-server multicast and broadcast traffic is sent through all uplink ports in the same
VLAN.
Note
Configuring Ethernet Switching Mode
When you change the Ethernet switching mode, Cisco UCS Manager logs you out and restarts the fabric
interconnect. For a cluster configuration, Cisco UCS Manager restarts both fabric interconnects sequentially.
The second fabric interconnect can take several minutes to complete the change in Ethernet switching
mode and become system ready. The configuration is retained.
Important
Procedure
Step 1
In the Navigation pane, click the Equipment tab.
Step 2
On the Equipment tab, expand Equipment > Fabric Interconnects > Fabric_Interconnect_Name.
Step 3
In the Work pane, click the General tab.
Step 4
In the Actions area of the General tab, click one of the following links:
• Set Ethernet Switching Mode
• Set Ethernet End-Host Mode
Cisco UCS Manager GUI Configuration Guide, Release 2.0
OL-25712-04 73
Configuring Ethernet Switching Mode