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Routing Protocols Cheat Sheet
RIP, OSPF, EIGRP, BGP, and first-hop redundancy protocols
| Protocol | Type | Metric | Convergence | Scalability | Use Case |
|---|---|---|---|---|---|
| RIP | Distance Vector | Hop count (max 15) | Slow | Small networks | Legacy, lab environments |
| RIPng | Distance Vector | Hop count | Slow | Small | IPv6 small networks |
| EIGRP | Advanced Distance Vector | Composite (bandwidth, delay) | Fast | Large | Cisco enterprise |
| OSPF | Link State | Cost (bandwidth) | Fast | Very large | Enterprise, ISP |
| IS-IS | Link State | Cost | Fast | Very large | ISP backbones |
| BGP | Path Vector | AS path, policies | Slow | Internet-scale | Internet routing, ISPs |
| iBGP | Path Vector | AS path | Slow | Large | Within autonomous system |
| eBGP | Path Vector | AS path, policies | Slow | Internet | Between autonomous systems |
| Static Routing | Manual | Admin distance | Immediate | Very small | Stub networks, defaults |
| HSRP | FHRP | Priority | Fast | Gateway only | Default gateway redundancy |
| VRRP | FHRP | Priority | Fast | Gateway only | Default gateway redundancy |
| GLBP | FHRP | Priority, weight | Fast | Gateway only | Load-balancing gateway |
📊 Protocol Types
- • Distance Vector: RIP, EIGRP (shares routes)
- • Link State: OSPF, IS-IS (shares topology)
- • Path Vector: BGP (shares AS paths)
🎯 Exam Focus
Know: OSPF uses cost (bandwidth), RIP uses hop count (max 15), BGP is the "glue of the Internet."