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Up/up interface state

As explained in Acing the CCNA Exam: Volume 1 Fundamentals and Protocols

An up/up interface state indicates that a network interface is administratively enabled and its underlying protocol is operational.

An up/up interface state means an interface is administratively enabled and its underlying protocol is operational. Cisco displays these conditions in the Status and Protocol columns of show ip interface brief. For an SVI, up/up is required before it can function for Layer 3 switching. section 12.4.2

Troubleshoot an SVI that is not up/up by checking these requirements:

Verify SVI state

Use show ip interface brief | include Vlan. Output such as “Vlan10 ... up up” confirms that the SVI is up/up; output showing “up down” indicates that the interface is enabled but its protocol is not operational.

How Acing the CCNA Exam: Volume 1 Fundamentals and Protocols covers it

How deep it goes
Explains status and protocol meanings, then provides four SVI requirements and a troubleshooting checklist.
Examples
Uses Cisco show output for three up/up SVIs and configuration failures that produce up/down states.
What it assumes
Assumes familiarity with VLANs, SVIs, and Cisco interface-status output.
What you can do after
Diagnose SVI state with show ip interface brief and check VLAN, port, trunk, and shutdown conditions.
How it connects
Connects interface state with SVIs, VLANs, multilayer switching, access ports, and trunk ports.
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