Which attribute in BGP represents a route's origin information?

Which attribute in BGP represents a route's origin information?

• A. Next hop
• B. AS path
• C. Origin
• D. Multi-exit discriminator

Answer: (C)

The attribute that represents a route's origin information in BGP (Border Gateway Protocol) is the origin attribute. This attribute indicates the source of the route and helps in determining the route's legitimacy and preference within the BGP decision process. When a router receives a BGP route, the origin attribute can take one of three values: IGP (Interior Gateway Protocol), EGP (Exterior Gateway Protocol), or incomplete. Each of these values signifies where the routing information originated. An IGP origin indicates that the route was learned from an interior routing protocol, an EGP origin signifies the route was sourced from an exterior protocol, and an incomplete origin suggests that the route was obtained by other means, such as redistribution from another routing protocol or manual entry. Understanding the origin attribute is crucial for BGP route selection and helps ensure that routers make informed decisions based on the reliability of the route source, which ultimately affects network stability and efficiency. As for the other potential answers, while the next hop attribute indicates the next router to which the packet should be sent, and the AS path attribute provides a list of ASes that the route has traversed, these do not specifically detail the origin of the route itself. The Multi-exit Discriminator (MED) is

The attribute that represents a route's origin information in BGP (Border Gateway Protocol) is the origin attribute. This attribute indicates the source of the route and helps in determining the route's legitimacy and preference within the BGP decision process.

When a router receives a BGP route, the origin attribute can take one of three values: IGP (Interior Gateway Protocol), EGP (Exterior Gateway Protocol), or incomplete. Each of these values signifies where the routing information originated. An IGP origin indicates that the route was learned from an interior routing protocol, an EGP origin signifies the route was sourced from an exterior protocol, and an incomplete origin suggests that the route was obtained by other means, such as redistribution from another routing protocol or manual entry.

Understanding the origin attribute is crucial for BGP route selection and helps ensure that routers make informed decisions based on the reliability of the route source, which ultimately affects network stability and efficiency.

As for the other potential answers, while the next hop attribute indicates the next router to which the packet should be sent, and the AS path attribute provides a list of ASes that the route has traversed, these do not specifically detail the origin of the route itself. The Multi-exit Discriminator (MED) is