CCNP Large Scale BGP: MED, Weight, AS path prepending: GNS3 CCNP Lab 1.6: Answers Part 6

GNS3 Portable Project File: https://bit.ly/2JjtYh6 This is one of multiple Cisco CCNP GNS3 Labs. Are you ready to pass your CCNP exam? For lots more content, visit http://www.davidbombal.com - learn about GNS3, CCNA, Packet Tracer, Python, Ansible and much, much more. 300-101 ROUTE Exam information: https://bit.ly/2GkcFXQ 300-115 SWITCH Exam information: https://bit.ly/2KrSWIe 300-135 TSHOOT Exam information: https://bit.ly/2IlHpgY Training: http://www.davidbombal.com BGP Weight: The weight attribute is a Cisco-defined attribute. This attribute uses weight to select a best path. The weight is assigned locally to the router. The value only makes sense to the specific router. The value is not propagated or carried through any of the route updates. A weight can be a number from 0 to 65,535. Paths that the router originates have a weight of 32,768 by default, and other paths have a weight of 0. Routes with a higher weight value have preference when multiple routes to the same destination exist. MED: The metric attribute also has the name MULTI_EXIT_DISCRIMINATOR, MED (BGP4), or INTER_AS (BGP3). The attribute is a hint to external neighbors about the path preference into an AS. The attribute provides a dynamic way to influence another AS in the way to reach a certain route when there are multiple entry points into that AS. A lower metric value is preferred more. Unlike local preference, metric is exchanged between ASs. A metric is carried into an AS but does not leave the AS. When an update enters the AS with a certain metric, that metric is used to make decisions inside the AS. When the same update passes on to a third AS, that metric returns to 0. The diagram in this section shows the set of metric. The metric default value is 0. Unless a router receives other directions, the router compares metrics for paths from neighbors in the same AS. In order for the router to compare metrics from neighbors that come from different ASs, you need to issue the special conf