H12-821_V1.0 · Question #577
Which of the following BGP route attributes can the Route-Policy tool modify? (Multiple choice)
The correct answer is A. MED B. AS_Path C. Community D. Preferred-Value E. Origin. All five options are correct because the Route-Policy tool (common in Huawei/Datacom contexts) is a comprehensive route policy mechanism that can read and modify any of these BGP path attributes when applying inbound or outbound policies. MED (Multi-Exit Discriminator) can be…
Question
Options
- AMED
- BAS_Path
- CCommunity
- DPreferred-Value
- EOrigin
How the community answered
(29 responses)- A100% (29)
Explanation
All five options are correct because the Route-Policy tool (common in Huawei/Datacom contexts) is a comprehensive route policy mechanism that can read and modify any of these BGP path attributes when applying inbound or outbound policies. MED (Multi-Exit Discriminator) can be set to influence how external peers enter your AS. AS_Path can be prepended to manipulate path length and traffic engineering. Community values can be added, deleted, or replaced to tag routes for downstream filtering. Preferred-Value (a Huawei-proprietary local attribute) can be set to influence local route selection priority. Origin can be changed among IGP, EGP, and Incomplete to affect best-path selection.
Since every listed option is a valid answer, there are no distractors - the question is testing whether you know the full scope of Route-Policy's capabilities, and a common mistake is assuming it cannot touch Origin or Preferred-Value.
Memory tip: Think of Route-Policy as a "full control panel" - if it's a standard or vendor-extended BGP attribute, Route-Policy can touch it. Use the acronym MACAO (MED, AS_Path, Community, Attribute Preferred-Value, Origin) to recall all five modifiable attributes on exam day.
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