When you’re planning to move the BSCI Examination and receive your CCNP certification, amongst the most important issues is Discovering BGP. BGP is completely different from any protocol you realized to gain your CCNA certification, and on the list of variations is always that BGP works by using path attributes to favor a person route about An additional when several paths to or from a destination exist.
Recognize I said “to or from”. In earlier no cost BGP tutorials, I talked over the BGP attributes “body weight” and “regional preference”. These attributes are used to favor one particular path into a destination more than another; as an example, if BGP AS a hundred has two paths to a destination in AS 200, both of these attributes could be established in AS one hundred to favor a single route above Yet another. But Imagine if AS 안전공원 100 needs to tell the routers in AS two hundred concerning which path it should really use to achieve a supplied location in AS a hundred?
That’s where the BGP attribute “Multi-Exit Discriminator”, or MED, comes in. The MED value can be established in AS a hundred to inform AS two hundred which route it really should use to reach a specified network in AS 100.
As with a lot of BGP characteristics, the MED can be set which has a route-map. What you'll want to enjoy is that there is no “set med” price in route maps. To alter the MED of a route, you need to alter the metric of that path. Allow’s say there http://edition.cnn.com/search/?text=토토사이트 are two entry paths for AS 200 to implement to achieve destinations in AS a hundred. You desire AS two hundred to use the a hundred.one.1.0/24 path in excess of the one hundred.2.2.0/24 path. To start with, discover the two paths with two independent ACLs.
R1(config)#access-checklist 22 permit a hundred.one.one.0 0.0.0.255
R1(config)#accessibility-record 23 allow 100.two.two.0 0.0.0.255
Next, generate a route-map that assigns a decrease metric to the more-appealing path.
R1(config)#route-map PREFER_PATH permit ten
R1(config-route-map)#match ip tackle 22
R1(config-route-map)#set metric 100
R1(config-route-map)#route-map PREFER_PATH permit 20
R1(config-route-map)#match ip handle 23
R1(config-route-map)#established metric 250
Finally, use the route-map on the neighbor or neighbors.
R1(config-route-map)#router bgp a hundred
R1(config-router)#neighbor 22.2.2.2 route-map PREFER_PATH out
The key factors to keep in mind is although quite a few BGP attributes favor a higher price, the MED is essentially an external metric – plus a reduced metric is most well-liked, equally as with the protocols you’ve now studied to receive your CCNA certification.