Cisco Systems, Inc.
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Uplink Interface Connectivity
This workflow describes how to configure the Ethernet interfaces that connect a switch or switch stack
to distribution switches or routers. These interfaces are uplink interfaces. They are different from access
interfaces that connect to non-networking end devices such as IP phones, personal computers, wireless
access points, printers, and IP cameras.
The switch interface configuration recommendations are based on a switch stack deployed in the campus
or branch of the access layer.
When stacking two or more physical switches into one logical switch, we recommend that the uplink
interfaces are configured across the physical members to ensure that an active uplink interface always
available for switch-stack members.
Prerequisites for Uplink Interface Connectivity
Ensure that the best-practice configurations are set, as described in the Global System Configuration
workflow.
Restrictions for Uplink Interface Connectivity
• A maximum of only eight physical links can be active in a single EtherChannel group.
• All the ports in an EtherChannel must be assigned to the same VLAN, or must be configured as trunk
ports.
• All the interfaces in an EtherChannel must be of the same type, for example, Gigabit Ethernet
interfaces cannot be mixed with 10-Gbps interfaces.
Identify Configuration Values
We recommend that you identify certain switch configuration values in advance so that you can proceed
with this workflow without interruption. We recommend that you take a print out of Table 5, and, as you
follow the configuration sequence, replace the values in column B with your values in column C.
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