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JN0-661 · Question #31

You are asked to implement route damping on a BGP router. There are two specific requirements for your implementation: 1. damp all prefixes with a mask length equal to or greater than /24 more…

The correct answer is A. [edit policy-options]. The default half-life is 15 minutes. The default value of suppress is 3000. To aggressively damp prefixes we should increase half-life, to for example 30 minutes, and to decrease the damp we should lower the half-life, to for example 5. B, C: The intervals in the route filter…

Advanced BGP

Question

You are asked to implement route damping on a BGP router. There are two specific requirements for your implementation: 1. damp all prefixes with a mask length equal to or greater than /24 more aggressively than routes with a mask length between /17 and /23; 2. damp prefixes with a mask length between /0 and /16 less than routes with a mask length greater than /16. Which policy configuration meets the requirement?

Options

  • A[edit policy-options]
  • B[edit policy-options]
  • C[edit policy-options]
  • D[edit policy-options]

How the community answered

(36 responses)
  • A
    83% (30)
  • B
    3% (1)
  • C
    6% (2)
  • D
    8% (3)

Explanation

The default half-life is 15 minutes. The default value of suppress is 3000. To aggressively damp prefixes we should increase half-life, to for example 30 minutes, and to decrease the damp we should lower the half-life, to for example 5. B, C: The intervals in the route filter should be /0-/16 and /24-/32, not /0-/23 and /24-/32. D: We should increase half-life, not decrease it to 5. routing-policies-to-damp-bgp-route-flapping.html

Topics

#BGP route damping#prefix length matching#routing policy#half-life tuning

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