Convert FastEthernet/Serial to Ethernet in gns3vault-archive configs

[Copilot]

Router configs used legacy FastEthernet and Serial interfaces incompatible with Cisco IOL containerlab deployments. All 1910 config files (both startup-configs and final-configs) required Ethernet interfaces to match the topology files' addressing scheme with proper +1 offset mapping.

Changes

Interface Type Conversion

• FastEthernet0/0 → Ethernet0/0, FastEthernet1/0 → Ethernet0/1, FastEthernet2/0 → Ethernet0/2
• Serial0/0 → Ethernet0/0, Serial1/0 → Ethernet0/1, Serial2/0 → Ethernet0/2, Serial2/1 → Ethernet0/3
• Preserved special interfaces: Loopback, Tunnel, Vlan, Port-channel, GigabitEthernet

Offset Mapping

Topology files enumerate interfaces starting at Ethernet0/1. Containerlab maps these to router physical ports with -1 offset:

• Topology Ethernet0/1 → Config Ethernet0/0 (physical port 0)
• Topology Ethernet0/2 → Config Ethernet0/1 (physical port 1)

Example

- interface FastEthernet0/0
+ interface Ethernet0/0
   ip address 192.168.12.1 255.255.255.0
- interface Serial2/0
+ interface Ethernet0/2
   ip address 192.168.34.3 255.255.255.0

Scope

• 967 config files in startup-configs directories
• 943 config files in final-configs directories
• Total: 1910 config files modified across all gns3vault-archive lab categories (BGP, OSPF, MPLS, EIGRP, RIP, Multicast, Switching, Security, etc.)

Original prompt

Check if all gns3vault-archive containerlab topologies are correct.

interface numbers should start with ethernet0/1.

router configs should start with ethernet0/1.

there is a +1 offset between Containerlab topology file and router config. That's how it Works

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[renemolenaar82]

Recheck this because files might have been updated.

[Copilot]

Recheck this because files might have been updated.

Rechecked all gns3vault-archive configs. Found and fixed 943 additional config files in final-configs directories that still had FastEthernet/Serial interfaces. All 1910 router configs now use Ethernet interfaces with proper +1 offset mapping (topology Ethernet0/1 → config Ethernet0/0). Commit: b7eea2e