Any time you’re planning to go the BSCI Test and earn your CCNP certification, one among the biggest troubles is Understanding BGP. BGP is totally various from any protocol you figured out to generate your CCNA certification, and among the distinctions is that BGP uses route characteristics to favor one particular route about Yet another when numerous paths to or from a spot exist.
Recognize I mentioned “to or from”. In previously cost-free BGP tutorials, I 안전놀이터 talked about the BGP characteristics “bodyweight” and “nearby choice”. These attributes are accustomed to favor just one path to your destination in excess of An additional; as an example, if BGP AS a hundred has two paths to a place in AS two hundred, both of these attributes may be established in AS a hundred to favor a person path over An additional. But Let's say AS one hundred needs to inform the routers in AS two hundred concerning which route it really should use to reach a provided destination in AS one hundred?
That’s exactly where the BGP attribute “Multi-Exit Discriminator”, or MED, is available in. The MED worth might be set in AS one hundred to tell AS 200 which route it ought to use to reach a supplied community in AS one hundred.
As with numerous BGP characteristics, the MED can be established with a route-map. What you must check out is that there's no “set med” price in route maps. To alter the MED of a path, you have to alter the metric of that route. Enable’s say there are two entry paths for AS two hundred to implement to achieve Places in AS 100. You'd like AS 200 to utilize the one hundred.1.1.0/24 path about the 100.2.2.0/24 route. First, identify The 2 paths with two separate ACLs.
R1(config)#access-list 22 allow 100.1.1.0 0.0.0.255
R1(config)#access-list 23 permit 100.two.two.0 0.0.0.255
Next, write a http://edition.cnn.com/search/?text=토토사이트 route-map that assigns a decreased metric to the greater-fascinating route.
R1(config)#route-map PREFER_PATH permit 10
R1(config-route-map)#match ip address 22
R1(config-route-map)#established metric a hundred
R1(config-route-map)#route-map PREFER_PATH permit 20
R1(config-route-map)#match ip tackle 23
R1(config-route-map)#set metric 250
Lastly, utilize the route-map to your neighbor or neighbors.
R1(config-route-map)#router bgp a hundred
R1(config-router)#neighbor 22.two.two.two route-map PREFER_PATH out
The crucial element factors to remember is always that while several BGP attributes like a better value, the MED is largely an exterior metric – plus a lower metric is desired, equally as While using the protocols you’ve currently examined to gain your CCNA certification.