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Mastering Cisco routing starts with mastering the CLI. This comprehensive guide covers essential IOS commands for configuring, troubleshooting, and optimizing routing in real-world networks.
You Should Know:
1. Fundamental Routing Commands
- Static Routing:
Router(config) ip route [bash] [bash] [bash]
- Default Routing:
Router(config) ip route 0.0.0.0 0.0.0.0 [bash]
2. Dynamic Routing Protocols
- RIP (Routing Information Protocol):
Router(config) router rip Router(config-router) version 2 Router(config-router) network [bash]
- EIGRP (Enhanced Interior Gateway Routing Protocol):
Router(config) router eigrp [bash] Router(config-router) network [bash] [bash]
- OSPF (Open Shortest Path First):
Router(config) router ospf [bash] Router(config-router) network [bash] [bash] area [bash]
3. Route Redistribution & Summarization
- Redistributing RIP into OSPF:
Router(config) router ospf 1 Router(config-router) redistribute rip subnets
- Summarizing EIGRP Routes:
Router(config) interface serial 0/0 Router(config-if) ip summary-address eigrp [bash] [bash] [bash]
4. Troubleshooting & Verification
- View Routing Table:
Router show ip route
- Debug RIP Updates:
Router debug ip rip
- Check OSPF Neighbors:
Router show ip ospf neighbor
5. Hands-on Lab Commands (Packet Tracer / GNS3)
- Save Configuration:
Router copy running-config startup-config
- Reset Router:
Router reload
What Undercode Say:
Mastering Cisco IOS commands is essential for network engineers. Practice these commands in labs (GNS3/Packet Tracer) to solidify your understanding. Automation (Python/Ansible) is the future, but CLI proficiency remains critical.
Prediction:
As networks evolve, CLI expertise will merge with automation tools, making hybrid skills (CLI + scripting) indispensable for network engineers.
Expected Output:
Router show ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 Gateway of last resort is 192.168.1.1 to network 0.0.0.0
Relevant URLs:
IT/Security Reporter URL:
Reported By: Shamseer Siddiqui – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
