Whenever you’re planning to go the BSCI Test and make your CCNP certification, certainly one of the biggest troubles is Studying BGP. BGP is totally unique from any protocol you acquired to make your CCNA certification, and one of the variations is the fact BGP works by using route attributes to favor just one path around Yet another when multiple paths to or from a desired destination exist.
Observe I said “to or from”. In previously cost-free BGP tutorials, I mentioned the BGP characteristics “fat” and “local choice”. These attributes are used to favor a person route to the vacation spot about another; as an example, if BGP AS a hundred has two paths into a destination in AS two hundred, these two characteristics may be established in AS one hundred to favor 1 path above another. But Imagine if AS one hundred needs to tell the routers in AS 200 as to which route it should really use to succeed in http://edition.cnn.com/search/?text=먹튀검증 a offered location in AS one hundred?
That’s where the BGP attribute “Multi-Exit Discriminator”, or MED, is available in. The MED benefit can be set in AS one hundred to tell AS two hundred which route it should use to succeed in a supplied network in AS a hundred.
Just like several BGP characteristics, the MED might be set which has a route-map. What you need to check out is that there is no 먹튀검증 “set med” worth in route maps. To change the MED of a route, you should alter the metric of that path. Allow’s say there are two entry paths for AS 200 to make use of to reach Locations in AS a hundred. You want AS two hundred to utilize the one hundred.1.one.0/24 route about the one hundred.2.two.0/24 path. Very first, identify The 2 paths with two independent ACLs.
R1(config)#entry-list 22 permit 100.one.1.0 0.0.0.255
R1(config)#access-record 23 permit one hundred.two.2.0 0.0.0.255
Future, generate a route-map that assigns a decrease metric to the greater-attractive route.
R1(config)#route-map PREFER_PATH allow ten
R1(config-route-map)#match ip address 22
R1(config-route-map)#set metric a hundred
R1(config-route-map)#route-map PREFER_PATH allow twenty
R1(config-route-map)#match ip tackle 23
R1(config-route-map)#established metric 250
At last, utilize the route-map into the neighbor or neighbors.
R1(config-route-map)#router bgp 100
R1(config-router)#neighbor 22.2.2.two route-map PREFER_PATH out
The true secret points to keep in mind is that while many BGP characteristics like a greater price, the MED is largely an external metric – in addition to a decrease metric is most popular, just as With all the protocols you’ve previously analyzed to generate your CCNA certification.