[Cisco] RIP、EIGRP、OSPF 路由協定比較
當初考CCNA Routing Switching(200–125) 時候很在意這三大路由協定的差別
上課時的一個RIP 、EIGRP、OSPF 比較:
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EIGRP VS OSPF
EIGRP
- Hybrid protocol –Distance vector (first time) Link state (updates)
2. Summarization possible on all the routers.
3. Easy to configure (No area configs) & can separate routes wrt to AS numbers
4. Not much processor oriented as the metric from the neighbor is believed and also feasible successor in place
5. No dependency… like underlying area 0
6. Add as many routers u want, with proper planning and summarization.
7. Easy to design and redesign
8. Only 2 route types (Internal & external)
9. Convergence is faster as the hello:dead = 5:15 & also because of the successor & feasible successor.
10. Supports only md5 authentication
11. Hello/Dead shud not match, helps while making changes
12. Stuck in Active scenario (can be addressed with summarization / stub / disabling active-timers)
13. In modern DMVPN designs, EIGRP has managed tomove past 3500 peers
14. Equal cost load-balancing is possible ! (variance)
15. traffic-share balanced: traffic load balancing according to the cost of the available links.
OSPF
1. Purely a Link state protocol.
2. Summarization possible on ABR & ASBR only.
3. A bit complex to design wrt to areas, as all the OSPF routes gets traverse across OSPF domain.
4. Consumes more resources of the device to run SPF every time a change happens in network.
5. Must have to rely on area 0 to communicate interarea.
6. Adding routers in an area may increase the size of LSBD
7. May be easy to desing, but for redesigning and adding areas, virtual link is required.
8. 11 types of routes (LSAs)
9. Conversion time is higher than EIGRP, hello:dead=10:40
10. Supports clear text & md5 authentication
11. Hello/dead timers shud be the same, bit difficult to make the changes
12. No Stuck in active.
13. Equal cost load-balancing is not possible !
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