STEP 13 — Configure ONE LAN interface on HO-R1

We will ONLY do this:

• Bring up the LAN-facing interface
• Give it ONE IP address
• Nothing else

❌ No VLANs yet
❌ No routing
❌ No DHCP

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🔹 What we are configuring (very clear)

• Device: HO-R1
• Interface: GigabitEthernet0/0
• Purpose: Head Office LAN gateway (temporary, single network)

This is just to:

• Learn interface config
• Learn no shutdown
• Learn IP assignment

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🔹 IP details (simple)

We’ll use one LAN for now:

• Network: 10.10.10.0 /24
• Gateway (HO-R1): 10.10.10.1

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🔹 Exact commands (type slowly)

1️⃣ Click HO-R1
2️⃣ Go to CLI
3️⃣ Type exactly:

enable
configure terminal
interface gigabitEthernet0/0
ip address 10.10.10.1 255.255.255.0
no shutdown
end

You should see:

%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up

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🔹 Save (always do this)

write memory

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🔹 Quick verification (LOOK only)

show ip interface brief

You should see:

• GigabitEthernet0/0 → up / up
• IP: 10.10.10.1

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🧠 What you just learned (important)

• Routers do nothing until interfaces are enabled
• no shutdown is mandatory
• The router interface = default gateway

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🚫 STOP HERE

Do NOT:

• Configure switches
• Configure PCs
• Configure VLANs
• Touch R2 or R0