After you’re making ready to go the BSCI Examination and get paid your CCNP certification, considered one of the largest problems is Mastering BGP. BGP is completely unique from any protocol you figured out to earn your CCNA certification, and one of several variances is always that BGP takes advantage of route characteristics to favor just one path about A further when a number of paths to or from the destination exist.
See I stated “to or from”. In previously free of charge BGP tutorials, I mentioned the BGP attributes “excess weight” and “nearby desire”. These attributes are used to favor a person route to your desired destination in excess of A different; for example, if BGP AS one hundred has two paths to your spot in AS 200, both of these attributes is usually set in AS 100 to favor 1 path more than A further. But what if AS a hundred wishes to tell the routers in AS 200 regarding which path 안전놀이터 it must use to succeed in a provided place in AS one hundred?
That’s the place the BGP attribute “Multi-Exit Discriminator”, or MED, comes in. The MED benefit may be established in AS a hundred to inform AS two hundred which route it should use to succeed in a provided community in AS one hundred.
Just like http://edition.cnn.com/search/?text=먹튀검증 several BGP attributes, the MED is often set having a route-map. What you'll want to watch is that there is no “set med” price in route maps. To alter the MED of the route, you have to alter the metric of that route. Let’s say there are two entry paths for AS two hundred to use to succeed in Places in AS a hundred. You would like AS 200 to make use of the 100.1.1.0/24 path more than the 100.two.2.0/24 path. First, detect the two paths with two individual ACLs.
R1(config)#obtain-checklist 22 permit a hundred.one.1.0 0.0.0.255
R1(config)#access-list 23 allow 100.2.two.0 0.0.0.255
Upcoming, create a route-map that assigns a reduce metric to the greater-appealing path.
R1(config)#route-map PREFER_PATH permit ten
R1(config-route-map)#match ip handle 22
R1(config-route-map)#established metric a hundred
R1(config-route-map)#route-map PREFER_PATH allow twenty
R1(config-route-map)#match ip deal with 23
R1(config-route-map)#established metric 250
At last, use the route-map towards the neighbor or neighbors.
R1(config-route-map)#router bgp one hundred
R1(config-router)#neighbor 22.two.two.2 route-map PREFER_PATH out
The crucial element details to bear in mind is that whilst numerous BGP attributes favor a better value, the MED is basically an external metric – plus a lessen metric is desired, just as Together with the protocols you’ve by now researched to get paid your CCNA certification.