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350-501 · Question #457

Which feature describes the weight parameter for BGP path selection?

The correct answer is A. Its value is local to the router. The BGP weight parameter is a Cisco-proprietary attribute that is entirely local to the router where it is configured and is never propagated to or understood by other BGP peers. It serves as the first criterion in the BGP path selection process to influence outbound traffic.

Networking

Question

Which feature describes the weight parameter for BGP path selection?

Options

  • AIts value is local to the router
  • BIts value is set either locally or globally.
  • CIts default value is 0.
  • DIts value is global to the router.

How the community answered

(44 responses)
  • A
    89% (39)
  • B
    7% (3)
  • C
    2% (1)
  • D
    2% (1)

Why each option

The BGP weight parameter is a Cisco-proprietary attribute that is entirely local to the router where it is configured and is never propagated to or understood by other BGP peers. It serves as the first criterion in the BGP path selection process to influence outbound traffic.

AIts value is local to the routerCorrect

The BGP `weight` attribute is a Cisco-specific parameter used in the BGP path selection process. Its defining characteristic is that its value is local to the router on which it is configured; it is not advertised to other BGP peers and thus only affects path selection on that specific router. This makes it an effective tool for influencing outbound traffic locally.

BIts value is set either locally or globally.

While `weight` can be set globally as a default on a router or locally for specific neighbors/routes, the key point is its non-propagating nature. The term "globally" here could be misinterpreted as being propagated across the network, which is incorrect.

CIts default value is 0.

The default weight value is 32768 for routes that the router originates, and 0 for routes learned from other BGP peers. Therefore, stating its default value is always 0 is inaccurate.

DIts value is global to the router.

The `weight` value is not "global to the router" in the sense of applying universally without specific configuration to every path or being a globally understood attribute. Its significance is purely local, not global in the network context.

Concept tested: BGP weight attribute characteristics

Source: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html

Topics

#BGP#Path Selection#Weight Attribute

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