After you’re making ready to move the BSCI Test and generate your CCNP certification, one among the most important troubles is Studying BGP. BGP is totally diverse from any protocol you realized to gain your CCNA certification, and among the list of dissimilarities is usually that BGP uses path attributes to favor just one path above One more when various paths to or from a destination exist.
Detect I claimed “to or from”. In before totally free BGP tutorials, I discussed the BGP attributes “fat” and “community choice”. These characteristics are accustomed to favor one particular route to a desired destination more than another; one example is, if BGP AS one hundred has two paths to a destination in AS two hundred, these two characteristics could be established in AS a hundred to favor just one path above Yet another. But Let's say AS one hundred desires to tell the routers in AS two hundred regarding which path it must use to reach a specified destination in AS 100?
That’s in which the BGP attribute “Multi-Exit Discriminator”, or MED, comes in. The MED worth can be set in AS a hundred to inform AS 200 which route it must use to reach a specified network in AS a hundred.
As with quite a few BGP characteristics, the MED is often established by using a route-map. What you need to watch is that there is no “set med” price in route maps. To change the MED of the path, you need to change the metric of that path. Let’s say that there are two entry paths for AS two hundred to implement to reach Places in AS one hundred. You desire AS two hundred to use the 100.one.1.0/24 path above the a hundred.2.2.0/24 path. To start with, discover the two paths with two individual ACLs.
R1(config)#obtain-list 22 permit one hundred.1.one.0 0.0.0.255
R1(config)#obtain-checklist 23 permit one hundred.2.two.0 0.0.0.255
Future, compose a route-map that assigns a lower metric to the more-attractive path.
R1(config)#route-map PREFER_PATH permit ten
R1(config-route-map)#match ip address 22
R1(config-route-map)#established metric one 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
Eventually, utilize the 사설토토 route-map into the neighbor or neighbors.
R1(config-route-map)#router bgp one hundred
R1(config-router)#neighbor 22.two.2.2 route-map PREFER_PATH out
The crucial element factors to remember is always that though quite a http://www.bbc.co.uk/search?q=토토사이트 few BGP attributes like the next value, the MED is largely an external metric – as well as a reduced metric is preferred, just as Using the protocols you’ve by now researched to earn your CCNA certification.