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300-320 · Question #708

300-320 Question #708: Real Exam Question with Answer & Explanation

The correct answer is C: Higher weight. BGP Weight is a Cisco-proprietary attribute that is strictly local to the router on which it is configured. It is never advertised to any BGP neighbor (neither iBGP nor eBGP peers), making it immune to external influence. A higher weight value is preferred. Because neighbors cann

Question

What to configure in BGP so that other BGP neighbours cannot influence the path of a route.

Options

  • ALower MED
  • BHigher Local pref
  • CHigher weight
  • DLower router ID

Explanation

BGP Weight is a Cisco-proprietary attribute that is strictly local to the router on which it is configured. It is never advertised to any BGP neighbor (neither iBGP nor eBGP peers), making it immune to external influence. A higher weight value is preferred. Because neighbors cannot send or influence the Weight attribute, configuring a higher weight for a specific path guarantees that the local router always prefers that path regardless of what neighbors advertise. Option A (lower MED) can be advertised to eBGP peers and is therefore subject to neighbor influence. Option B (higher Local Preference) is shared among all iBGP peers within the same AS, so other routers in the AS can influence it. Option D (lower Router ID) affects tie-breaking in path selection but not primary path preference, and neighbors can still influence the outcome via other attributes.

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