A network solution is being designed for a company that connects to multiple Internet service providers. Which Cisco proprietary BGP path attribute will influence outbound traffic flow?

Question

Options

• ALocal Preference
• BMED
• CWeight
• DAS Path
• ECommunity

• A
  6% (1)
• B
  6% (1)
• C
  88% (14)

Explanation

Weight is a Cisco proprietary BGP attribute (not defined in any RFC) that exists only on the local router and is never advertised to BGP peers. It is used to influence outbound traffic selection: the route with the highest Weight is preferred. Because it is local and Cisco-specific, it is the ideal tool when a multi-homed router needs to steer outbound traffic toward a preferred ISP without affecting any other router in the network. Local Preference (A) is a standard BGP attribute used within an AS to influence outbound paths, but it is not Cisco proprietary. MED (B) influences inbound traffic from neighbors. AS Path (D) and Community (E) are both standard BGP attributes defined in RFCs.

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