300-320 · Question #1
What is the maximum number of routers that each OSPF area (including the backbone) should contain?
The correct answer is C. 50. Cisco OSPF design best practices recommend limiting each OSPF area to a maximum of 50 routers to maintain scalability and reduce LSA flooding overhead.
Question
What is the maximum number of routers that each OSPF area (including the backbone) should contain?
Options
- A30
- B10
- C50
- D100
How the community answered
(20 responses)- B5% (1)
- C90% (18)
- D5% (1)
Why each option
Cisco OSPF design best practices recommend limiting each OSPF area to a maximum of 50 routers to maintain scalability and reduce LSA flooding overhead.
30 routers is below the recommended ceiling and is too conservative - it is not the recognized design guideline maximum.
10 routers per area is far too restrictive and does not reflect any Cisco OSPF design recommendation.
Cisco's OSPF design guidelines recommend no more than 50 routers per OSPF area, including the backbone (Area 0). Exceeding this limit causes excessive LSA flooding, increased SPF calculation load, and slower convergence as the link-state database grows too large for efficient processing.
100 routers per area exceeds the recommended limit and would cause scalability issues such as excessive SPF recalculations and large LSDBs.
Concept tested: OSPF area design scalability router limit
Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html
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