Stop hand-writing configs. Learn how to use AI tools like ChatGPT and GitHub Copilot to generate accurate Cisco IOS, Junos, and MikroTik configurations in seconds.
$ claude "Create VLAN 10 for guest WiFi on Cisco IOS" [+] Generating config for Cisco IOS... [+] vlan 10 [+] name GUEST_WIFI [+] interface GigabitEthernet0/1 [+] switchport mode access [+] switchport access vlan 10 [+] spanning-tree portfast [+] Done. Config ready to paste. ✓
To generate accurate network configurations with AI, include the device vendor, model, specific port assignments, IP addresses, and the exact behavior you want in a single structured prompt. Specific input produces CLI-ready output; vague prompts produce generic templates you still have to rewrite. Always review AI output line by line for syntax that matches your exact platform version, and test in a lab — GNS3, EVE-NG, or Packet Tracer — before touching production. This guide shows the difference between prompts that work and prompts that waste time.
AI generates configs based on what you tell it. Vague input → vague output. Specific input → config you can actually use.
Bad prompt:
Make a VLAN config
Good prompt:
Generate a Cisco IOS configuration for a Catalyst 2960 switch. Create VLAN 10 named CORP and VLAN 20 named GUEST. Assign Gi0/1 through Gi0/8 to VLAN 10 as access ports. Assign Gi0/9 through Gi0/16 to VLAN 20 as access ports. Configure Gi0/24 as a trunk port allowing VLANs 10 and 20.
The more context you give — device vendor, model, what ports, what behavior — the more accurate the output.
Prompt:
Generate Cisco IOS config for a 2960 switch. VLANs: 10 (CORP), 20 (GUEST), 99 (MGMT). Gi0/1-8 access VLAN 10, Gi0/9-16 access VLAN 20. Gi0/24 trunk, allow 10, 20, 99. Management IP 192.168.99.10/24 on VLAN 99.
AI output (cleaned up):
vlan 10
name CORP
vlan 20
name GUEST
vlan 99
name MGMT
interface range GigabitEthernet0/1 - 8
switchport mode access
switchport access vlan 10
spanning-tree portfast
interface range GigabitEthernet0/9 - 16
switchport mode access
switchport access vlan 20
spanning-tree portfast
interface GigabitEthernet0/24
switchport mode trunk
switchport trunk allowed vlan 10,20,99
interface Vlan99
ip address 192.168.99.10 255.255.255.0
no shutdown
ip default-gateway 192.168.99.1That’s a complete, deployable config generated in about 10 seconds.
Prompt:
Cisco IOS router. Configure OSPF area 0. Interfaces: Gi0/0 = 10.0.0.1/30 (connected to ISP router), Gi0/1 = 192.168.1.1/24 (LAN). Advertise LAN network only. Set Gi0/0 as passive if possible but still form neighbor.
AI output:
router ospf 1
router-id 10.0.0.1
passive-interface GigabitEthernet0/1
network 10.0.0.0 0.0.0.3 area 0
network 192.168.1.0 0.0.0.255 area 0
interface GigabitEthernet0/0
ip address 10.0.0.1 255.255.255.252
ip ospf 1 area 0
interface GigabitEthernet0/1
ip address 192.168.1.1 255.255.255.0
ip ospf 1 area 0Note: AI correctly flagged in its response that making Gi0/0 fully passive would prevent neighbor formation — it applied passive only to the LAN side. That’s the kind of nuance good prompting surfaces.
Prompt:
Cisco IOS extended ACL. Guest VLAN 192.168.20.0/24 should access the internet but NOT reach the corporate LAN 192.168.10.0/24 or management network 192.168.99.0/24. Apply inbound on VLAN 20 SVI.
AI output:
ip access-list extended GUEST_RESTRICT
deny ip 192.168.20.0 0.0.0.255 192.168.10.0 0.0.0.255
deny ip 192.168.20.0 0.0.0.255 192.168.99.0 0.0.0.255
permit ip 192.168.20.0 0.0.0.255 any
interface Vlan20
ip access-group GUEST_RESTRICT inClean. No fuss.
Never paste AI output directly into production. That’s the one rule. Here’s the validation workflow:
1. Read it line by line. Does each line make sense? AI occasionally hallucinates a command that doesn’t exist or mismatches a syntax version. If something looks off, ask the AI to explain that specific line.
2. Check the vendor/version. Ask AI: “Is this syntax valid for IOS 15.2?” or specify the version in your prompt upfront. Syntax differences between IOS 12.x and 15.x, or between IOS and IOS-XE, will cause issues.
3. Test in a lab first. GNS3, EVE-NG, or even Packet Tracer. Paste the config into a virtual device and verify it behaves as expected before touching anything real.
4. Use show commands to verify.
After applying:
show vlan brief
show interfaces trunk
show ip ospf neighbor
show ip access-lists| Tool | Strengths |
|---|---|
| ChatGPT (GPT-4o) | Broad vendor support, good at explaining output |
| GitHub Copilot | Great for Python/Netmiko automation scripts |
| Claude | Strong at structured configs, good at catching edge cases |
| Gemini | Solid for multi-step config walkthroughs |
All of them work. The difference is in how you prompt, not which tool you use.
Copy these and fill in your details:
VLAN setup:
Generate [vendor] config for [device model]. Create VLANs [list with names]. Assign ports [range] to [VLAN]. Configure [port] as trunk allowing [VLANs]. Management IP [IP/mask] on VLAN [ID].
Routing:
Configure [OSPF/BGP/EIGRP] on [vendor] router. Interfaces: [list with IPs]. Advertise [networks]. [Any specific requirements].
ACL/Firewall rule:
Create an ACL on [vendor] device. Allow [source] to reach [destination] on [ports]. Deny [source] from reaching [destination]. Apply [inbound/outbound] on [interface].
Troubleshooting a config:
Here is my current config: [paste config]. I’m seeing [problem]. What is wrong and how do I fix it?
AI won’t replace your knowledge — it will multiply it. The admin who knows what they want but can get it configured in 10 seconds instead of 30 minutes is the one who ships faster and goes home on time.
Which AI model works best for generating network configurations? Claude Sonnet and GPT-4o both produce high-quality configs. The model matters less than the prompt — a specific, well-structured prompt on any capable model will outperform a vague prompt on the best model. Specify the vendor, device model, exact IOS or firmware version, interface names, and requirements.
How do I write a good prompt for network config generation? Include: vendor and device model, exact interface identifiers (Gi0/1, not “port 1”), IP addresses and subnet masks, VLAN IDs and names, the specific feature to configure (OSPF, ACL, trunk), and any constraints (which traffic to allow or deny, which interfaces face the WAN). The examples in this guide show the difference in output quality.
Can I paste AI-generated configs directly into production? No. Read the output line by line, verify syntax against your platform’s command reference, confirm that interface names match your actual device, and test in a lab first. AI occasionally generates commands that don’t exist on a specific IOS version or confuses IOS and IOS-XE syntax.
Does AI know the difference between Cisco IOS and IOS-XE? Generally yes, but specify which one in your prompt. State “Cisco IOS 15.2” or “Cisco IOS-XE 17.x” explicitly. Syntax differences between the two — especially for QoS, ACLs, and EIGRP — are common enough that the distinction matters for getting usable output.
Can AI generate Junos, pfSense, or MikroTik configs — not just Cisco? Yes. Claude and GPT-4o have solid coverage of Junos, pfSense, FortiGate, and MikroTik RouterOS. Apply the same rule: specify the platform and version in your prompt. “pfSense 2.7 — generate a firewall rule” will get you accurate results; “pfSense firewall rule” is too vague.
Q: Can AI generate Cisco IOS or NX-OS configuration?
A: Yes. Describe what you need in plain English — device type, interface names, VLANs, and the business requirement — and Claude or ChatGPT will output syntactically correct IOS config ready to paste. Always review the output before applying to production.
Q: How do I prompt an AI model to write accurate network configs?
A: Be specific: include the device platform (IOS, NX-OS, JunOS), interface names, IP addressing, and the goal. Example: "Generate a Cisco IOS config for Gi0/1, access VLAN 20, with port-security allowing 2 MACs." The more context you provide, the more accurate the output.
Q: What AI model is best for generating network configurations?
A: Claude (Anthropic) performs well on network configuration tasks due to strong technical reasoning and precise instruction following. ChatGPT-4o is also capable. For IOS and NX-OS specifics, Claude tends to produce fewer hallucinated commands on complex multi-step configs.