300-320 · Question #457
An CSPF router should have a maximum of how many adjacent neighbors?
The correct answer is B. 60. CSPF (Constrained Shortest Path First) is the path computation algorithm used in MPLS Traffic Engineering, running on top of OSPF or IS-IS. Cisco's design guidelines for scalable OSPF deployments (which underpin CSPF-TE) recommend a maximum of 60 adjacent neighbors per router…
Question
An CSPF router should have a maximum of how many adjacent neighbors?
Options
- A80
- B60
- C100
- D50
How the community answered
(31 responses)- B94% (29)
- C3% (1)
- D3% (1)
Explanation
CSPF (Constrained Shortest Path First) is the path computation algorithm used in MPLS Traffic Engineering, running on top of OSPF or IS-IS. Cisco's design guidelines for scalable OSPF deployments (which underpin CSPF-TE) recommend a maximum of 60 adjacent neighbors per router. Exceeding this limit increases the frequency and computational overhead of SPF recalculations and link-state database synchronization, degrading stability and scalability. This guideline helps ensure stable convergence in large-scale TE networks.
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