In BGP, MED is mainly used to affect BGP route selection between ASs. The smaller the MED attribute value, the better the BGP route. By default, the BGP MED of all Huawei equipment is ____.

Question

Options

• A0
• B1
• C2
• D3

• A
  71% (44)
• B
  18% (11)
• C
  5% (3)
• D
  6% (4)

Explanation

On Huawei devices, the default BGP MED value is 0, meaning routes advertised without an explicit MED configured carry a value of zero, which is the lowest possible and therefore the most preferred when MED comparison is performed. Options B, C, and D are incorrect because Huawei does not default to any non-zero MED value; those values would only appear if an administrator explicitly configured them via a routing policy. The key point is that MED is a non-transitive optional attribute, and when not set, Huawei equipment originates routes with MED 0 by default.

Memory tip: Since lower MED is better in BGP, the default of 0 makes intuitive sense as the "best possible starting point" -- Huawei devices advertise their routes as maximally preferred unless you manually raise the MED to deprioritize them.

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