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Cisco Interfaces In Use
Jan 2024
Introduction
A really useful task to perform when looking at remote systems is to see what interfaces on a Cisco Switch are in use (as in connected). Lets look at how to see what interfaces we are using: sh interfaces status This has to be performed from the top level, same part of the Cisco menu you would do sh vlan br for instance.
sh interfaces status Port Name Status Vlan Duplex Speed Type Gi0/1 connected 2 a-full a-1000 10/100/1000BaseTX Gi0/2 notconnect 2 auto auto 10/100/1000BaseTX Gi0/3 notconnect 2 auto auto 10/100/1000BaseTX Gi0/4 notconnect 2 auto auto 10/100/1000BaseTX Gi0/5 connected 2 a-full a-1000 10/100/1000BaseTX Gi0/6 connected 2 a-full a-1000 10/100/1000BaseTX Gi0/7 connected 2 a-full a-1000 10/100/1000BaseTX Gi0/8 connected 2 a-full a-1000 10/100/1000BaseTX Gi0/9 notconnect 2 auto auto 10/100/1000BaseTX Gi0/10 notconnect 2 auto auto 10/100/1000BaseTX Gi0/11 notconnect 2 auto auto 10/100/1000BaseTX Gi0/12 notconnect 2 auto auto 10/100/1000BaseTX Gi0/13 notconnect 2 auto auto 10/100/1000BaseTX Gi0/14 notconnect 2 auto auto 10/100/1000BaseTX Gi0/15 notconnect 2 auto auto 10/100/1000BaseTX Gi0/16 notconnect 2 auto auto 10/100/1000BaseTX Gi0/17 notconnect 2 auto auto 10/100/1000BaseTX Gi0/18 notconnect 2 auto auto 10/100/1000BaseTX Gi0/19 notconnect 2 auto auto 10/100/1000BaseTX Gi0/20 notconnect 2 auto auto 10/100/1000BaseTX Gi0/21 notconnect 2 auto auto 10/100/1000BaseTX Gi0/22 notconnect 2 auto auto 10/100/1000BaseTX Gi0/23 notconnect 2 auto auto 10/100/1000BaseTX Gi0/24 notconnect 2 auto auto 10/100/1000BaseTX Gi0/25 notconnect 2 auto auto 10/100/1000BaseTX Gi0/26 notconnect 2 auto auto 10/100/1000BaseTX Gi0/27 notconnect 2 auto auto 10/100/1000BaseTX Gi0/28 notconnect 2 auto auto 10/100/1000BaseTX Gi0/29 notconnect 2 auto auto 10/100/1000BaseTX Gi0/30 notconnect 2 auto auto 10/100/1000BaseTX Gi0/31 notconnect 2 auto auto 10/100/1000BaseTX Gi0/32 notconnect 2 auto auto 10/100/1000BaseTX Gi0/33 connected 3 a-full a-1000 10/100/1000BaseTX Gi0/34 connected 3 a-full a-1000 10/100/1000BaseTX Gi0/35 notconnect 3 auto auto 10/100/1000BaseTX Gi0/36 notconnect 3 auto auto 10/100/1000BaseTX Gi0/37 notconnect 3 auto auto 10/100/1000BaseTX Gi0/38 notconnect 3 auto auto 10/100/1000BaseTX Gi0/39 notconnect 3 auto auto 10/100/1000BaseTX Gi0/40 notconnect 3 auto auto 10/100/1000BaseTX Gi0/41 notconnect 3 auto auto 10/100/1000BaseTX Gi0/42 notconnect 3 auto auto 10/100/1000BaseTX Gi0/43 notconnect 3 auto auto 10/100/1000BaseTX Gi0/44 notconnect 3 auto auto 10/100/1000BaseTX Gi0/45 connected 1 a-full a-1000 10/100/1000BaseTX Gi0/46 connected 1 a-full a-1000 10/100/1000BaseTX Gi0/47 notconnect 1 auto auto Not Present Gi0/48 notconnect 1 auto auto Not Present
In the above example above we can see that there are 9 interfaces in use, and we can see the following information:
Port Name Status Vlan Duplex Speed Type
Gi0/1 connected 2 a-full a-1000 10/100/1000BaseTX
Port - This is the interface number on the switch
Name - This only shows if any names have been assigned, generally they are not.
Status - Connected.
VLAN - What VLAN the interfaces is currently in.
DUPLEX - a-full (automatic-full)
SPEED - a-1000 (auto 1000)
TYPE - 10/100/1000BaseTX (this interface supports 10Mb/s / 100Mbs and 1GBs)