Uplink Interface Connectivity
Configure Uplink Interface Connectivity
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Best Practice User Guide for the Catalyst 3850 and Catalyst 3650 Switch Series
Configure an Uplink Interface as an EtherChannel and as a Trunk
Step 1 Choose one of the following configurations based on your network topology:
• “Configure an Uplink Interface to Connect to a Distribution VSS or VPC Switch”
• “Configure an Uplink Interface to Connect to a Distribution Router (or Standalone Distribution
Switch)”
Configure an Uplink Interface to Connect to a Distribution VSS or VPC Switch
1. Ensure that the distribution Virtual Switch System (VSS) or Virtual Port Channel (VPC) switch
connections are configured the same way and that the EtherChannel is configured in LACP active
mode.
2. For additional resilience, ensure that the uplink interfaces are located on different switches in the
switch stack.
Figure 6, shows the switch stack that has a single EtherChannel connection to a distribution VSS or VPC
switch pair.
The VSS and VPC systems have an explicit configuration between the Cisco distribution switch pair.
That allows them to act as a single logical switch when connected to the EtherChannel. The
EtherChannel is configured as a trunk with VLANs 10, 11, 12, and 100, with the native VLAN set to 999.
Note Use this switch-stack uplink interface configuration only when connecting the switch stack to a VSS or
VPC distribution switch pair, and not when the distribution switch pair is configured as two standalone
switches.
interface GigabitEthernet 1/1/1
auto qos trust dscp
service-policy input AutoQos-4.0-Trust-Dscp-input-Policy
service-policy output 2P6Q3T
exit
interface GigabitEthernet 1/1/2
auto qos trust dscp
service-policy input AutoQos-4.0-Trust-Dscp-input-Policy
service-policy output 2P6Q3T
exit
interface GigabitEthernet 2/1/1
auto qos trust dscp
service-policy input AutoQos-4.0-Trust-Dscp-input-Policy
service-policy output 2P6Q3T
exit
interface GigabitEthernet 2/1/2
auto qos trust dscp
service-policy input AutoQos-4.0-Trust-Dscp-input-Policy
service-policy output 2P6Q3T
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