====== Shutdown Cisco Interface ======
Jan 2024
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===== Introduction =====
While working with certain products, usually remotely, it is quite handy to unplug a Network Cable to test resilience (ensure that a backup route or device is used).
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However, when remote this is almost impossible, so to simulate this we can just take down the relevant interface on the Cisco to simulate a cable disconnect.
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==== Shutdown Interface ====
Before shutting down any interfaces, lets look a the status of the interfaces from the console. We can do this at the top level buy using this command:
sh interfaces status
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You will get an output similar to below:
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Port Name Status Vlan Duplex Speed Type
Gi0/1 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/2 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/3 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/4 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/5 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/6 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/7 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/8 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/9 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/10 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/11 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/12 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/13 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/14 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/15 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/16 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/17 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/18 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/19 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/20 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/21 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/22 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/23 ENCtoMuxPri connected 100 a-full a-1000 10/100/1000BaseTX
Gi0/24 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Interface 23 is connected, the rest are not.
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To shutdown an interface, we first have to select it as we would normally do for any other operation.
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en (enter password)
conf t
int gigabitEthernet 0/1 (nic 1) - (or you could shutdown a range with int gigabitEthernet 0/1-12 for example)
sh
end
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Now if you repeat the following command:
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sh interfaces status
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You will see that the first interface is shown as //**disabled**//.
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Port Name Status Vlan Duplex Speed Type
Gi0/1 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/2 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/3 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/4 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/5 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/6 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/7 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/8 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/9 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/10 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/11 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/12 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/13 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/14 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/15 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/16 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/17 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/18 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/19 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/20 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/21 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/22 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/23 ENCtoMuxPri connected 100 a-full a-1000 10/100/1000BaseTX
Gi0/24 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
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==== Bring Up Interface ====
To bring the interface back up, use the following:
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en (enter password)
conf t
int gigabitEthernet 0/1 (nic 1) - (or you could bring up a range with int gigabitEthernet 0/1-12 for example)
no sh
end
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==== Bring Up/Down more Interfaces ====
When we select the interface to Shutdown/Bring up we used in this above example:
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int gigabitEthernet 0/1
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This shuts down a single interface (The first interface on the box). We could however shutdown the first 10 interfaces by using:
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en (enter password)
conf t
int range gigabitEthernet 0/1-10
no sh
end
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Now we can see the first 10 interfaces are down:
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Port Name Status Vlan Duplex Speed Type
Gi0/1 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/2 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/3 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/4 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/5 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/6 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/7 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/8 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/9 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/10 MNGT disabled 100 auto auto 10/100/1000BaseTX
Gi0/11 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/12 MNGT notconnect 100 auto auto 10/100/1000BaseTX
Gi0/13 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/14 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/15 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/16 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/17 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/18 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/19 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/20 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/21 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/22 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
Gi0/23 ENCtoMuxPri connected 100 a-full a-1000 10/100/1000BaseTX
Gi0/24 ENCtoMuxPri notconnect 100 auto auto 10/100/1000BaseTX
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