Port Channel Fabric Interface Connection
To provide load balancing between the host interfaces and the parent switch, you can configure the Fabric
Extender to use a port channel fabric interface connection. This connection bundles 10-Gigabit Ethernet fabric
interfaces into a single logical channel as shown in the following figure.
Figure 2: Port Channel Fabric Interface Connection
When you configure the Fabric Extender to use a port channel fabric interface connection to its parent switch,
the switch load balances the traffic from the hosts that are connected to the host interface ports by using the
following load-balancing criteria to select the link:
• For a Layer 2 frame, the switch uses the source and destination MAC addresses.
• For a Layer 3 frame, the switch uses the source and destination MAC addresses and the source and
destination IP addresses.
A fabric interface that fails in the port channel does not trigger a change to the host interfaces. Traffic is
automatically redistributed across the remaining links in the port channel fabric interface. If all links in
the fabric port channel go down, all host interfaces on the FEX are set to the down state.
Note
Port Numbering Convention
The following port numbering convention is used for the Fabric Extender:
interface ethernet chassis/slot/port
where
•
chassis is configured by the administrator. A Fabric Extender must be directly connected to its parent
Cisco Nexus Series device via a port channel fabric interface. You configure a chassis ID on a port
channel on the switch to identify the Fabric Extender that is discovered through those interfaces.
Cisco Nexus 2000 Series NX-OS Fabric Extender Software Configuration Guide
OL-25816-02 9
Overview
Port Channel Fabric Interface Connection
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