Which of the following descriptions of the Preferred-Value attribute in BGP are correct? (Multiple choice)

Question

Options

• AThis attribute will be passed to iBGP peers.
• BThis attribute is unique to Huawei devices.
• CThe smaller the value of the attribute, the better the route.
• DThis attribute only affects the routing preference of this device.

• A
  18% (5)
• B
  71% (20)
• C
  11% (3)

Explanation

Preferred-Value is a Huawei-proprietary BGP attribute (not defined in any RFC), which is why B is correct - it does not exist on Cisco, Juniper, or other vendors' equipment. It is also a locally significant attribute, meaning it is never advertised to any peer (iBGP or eBGP), so D is correct - its influence on route selection is limited strictly to the router where it is configured.

A is wrong because Preferred-Value is never passed to any peers, including iBGP neighbors; it is discarded at the local router. C is wrong because BGP selects the route with the higher Preferred-Value as preferred - it behaves like Cisco's Weight attribute, where bigger is better.

Memory tip: Think of Preferred-Value as Huawei's version of Cisco's Weight - both are vendor-specific, locally significant, and higher-wins attributes that never leave the router they're set on.

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