Once you’re making ready to pass the BSCI Examination and make your CCNP certification, one among the most significant difficulties is Studying BGP. BGP is totally distinct from any protocol you learned to get paid your CCNA certification, and among the list of dissimilarities is https://en.search.wordpress.com/?src=organic&q=먹튀검증 always that BGP employs route characteristics to favor a single route above another when multiple paths to or from a vacation spot exist.
Recognize I claimed “to or from”. In previously absolutely free BGP tutorials, I talked about the BGP attributes “weight” and 먹튀사이트 “neighborhood choice”. These attributes are used to favor just one route into a vacation spot in excess of Yet another; by way of example, if BGP AS one hundred has two paths to a desired destination in AS 200, both of these attributes is often set in AS 100 to favor one path over A further. But Imagine if AS 100 would like to inform the routers in AS 200 regarding which route it really should use to reach a given spot in AS 100?
That’s in which the BGP attribute “Multi-Exit Discriminator”, or MED, comes in. The MED benefit is usually set in AS 100 to tell AS 200 which path it need to use to reach a presented community in AS a hundred.
As with lots of BGP attributes, the MED may be set which has a route-map. What you must look at is that there is no “established med” benefit in route maps. To change the MED of a route, you'll want to alter the metric of that path. Enable’s say that there are two entry paths for AS 200 to utilize to succeed in destinations in AS 100. You wish AS two hundred to use the 100.1.1.0/24 route over the 100.2.2.0/24 route. Very first, detect the two paths with two individual ACLs.
R1(config)#entry-record 22 permit 100.one.1.0 0.0.0.255
R1(config)#entry-list 23 permit one hundred.2.2.0 0.0.0.255
Up coming, produce a route-map that assigns a reduced metric to the more-attractive path.
R1(config)#route-map PREFER_PATH permit 10
R1(config-route-map)#match ip tackle 22
R1(config-route-map)#set metric 100
R1(config-route-map)#route-map PREFER_PATH allow twenty
R1(config-route-map)#match ip handle 23
R1(config-route-map)#set metric 250
Lastly, implement the route-map towards the neighbor or neighbors.
R1(config-route-map)#router bgp one hundred
R1(config-router)#neighbor 22.2.two.two route-map PREFER_PATH out
The main element factors to remember is usually that whilst quite a few BGP attributes prefer the next benefit, the MED is basically an exterior metric – and also a decrease metric is chosen, just as Together with the protocols you’ve currently researched to earn your CCNA certification.