If you’re preparing to pass the BSCI Examination and receive your CCNP certification, one of the largest issues is learning BGP. BGP is totally distinct from any protocol you learned to earn your CCNA certification, and one of several dissimilarities is usually that BGP utilizes path attributes to favor one route over Yet another when multiple paths to or from the place exist.
Detect I mentioned “to or from”. In previously totally free BGP tutorials, I talked over the BGP attributes “fat” and “regional choice”. These attributes are utilized to favor a single path to a 먹튀사이트 desired destination above Yet another; for example, if BGP AS one hundred has two paths to a location in AS 200, these two characteristics can be established in AS a hundred to favor one route in excess of A different. But Imagine if AS http://edition.cnn.com/search/?text=먹튀검증 a hundred wishes to inform the routers in AS 200 regarding which route it ought to use to reach a presented spot in AS a hundred?
That’s the place the BGP attribute “Multi-Exit Discriminator”, or MED, comes in. The MED benefit is usually set in AS 100 to tell AS two hundred which path it need to use to succeed in a presented community in AS 100.
Just like numerous BGP characteristics, the MED is often established which has a route-map. What you need to look at is that there's no “established med” worth in route maps. To alter the MED of the route, you must alter the metric of that path. Permit’s say there are two entry paths for AS 200 to work with to succeed in destinations in AS a hundred. You need AS two hundred to make use of the a hundred.1.1.0/24 path more than the a hundred.two.2.0/24 path. Very first, determine The 2 paths with two individual ACLs.
R1(config)#obtain-list 22 permit one hundred.one.1.0 0.0.0.255
R1(config)#access-listing 23 permit one hundred.2.2.0 0.0.0.255
Future, create a route-map that assigns a reduced metric to the greater-desirable route.
R1(config)#route-map PREFER_PATH permit ten
R1(config-route-map)#match ip deal with 22
R1(config-route-map)#set metric 100
R1(config-route-map)#route-map PREFER_PATH permit twenty
R1(config-route-map)#match ip address 23
R1(config-route-map)#established metric 250
Finally, use the route-map to the neighbor or neighbors.
R1(config-route-map)#router bgp one hundred
R1(config-router)#neighbor 22.2.two.2 route-map PREFER_PATH out
The true secret factors to bear in mind is the fact although lots of BGP characteristics like an increased benefit, the MED is basically an exterior metric – as well as a decrease metric is desired, just as Using the protocols you’ve presently studied to make your CCNA certification.