Whenever you’re making ready to pass the BSCI Examination and get paid your CCNP certification, certainly one of the most significant troubles is Studying BGP. BGP is totally diverse from any protocol you acquired to generate your CCNA certification, and among the discrepancies is the fact that BGP utilizes route characteristics to favor a person path in excess of A further when multiple paths to or from the vacation spot exist.
Observe I stated “to or from”. In earlier cost-free BGP tutorials, I talked about the BGP attributes “fat” and “regional desire”. These attributes are used to favor a person path to a vacation spot above another; for example, if BGP AS a hundred has two paths to your desired destination in AS two hundred, these two characteristics may be set in AS a hundred to favor a person route about A further. But what if AS one hundred needs to tell the routers in AS two hundred concerning which route it need to use to achieve a provided place in AS one hundred?
That’s the http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/먹튀검증 place the BGP attribute “Multi-Exit Discriminator”, or MED, is available in. The MED worth might be established in AS one hundred to inform AS 200 which route it ought to use to reach a presented community in AS 100.
As with several BGP attributes, the MED could be established that has 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 route, you must change the metric 토토검증 of that route. Allow’s say that there are two entry paths for AS two hundred to utilize to succeed in Places in AS a hundred. You wish AS 200 to use the 100.one.one.0/24 path around the 100.two.2.0/24 path. 1st, detect The 2 paths with two different ACLs.
R1(config)#access-checklist 22 allow 100.1.one.0 0.0.0.255
R1(config)#obtain-record 23 allow one hundred.two.two.0 0.0.0.255
Subsequent, write a route-map that assigns a decrease metric to the greater-fascinating path.
R1(config)#route-map PREFER_PATH allow 10
R1(config-route-map)#match ip tackle 22
R1(config-route-map)#established metric 100
R1(config-route-map)#route-map PREFER_PATH permit twenty
R1(config-route-map)#match ip tackle 23
R1(config-route-map)#set metric 250
Finally, utilize the route-map for the neighbor or neighbors.
R1(config-route-map)#router bgp a hundred
R1(config-router)#neighbor 22.two.two.2 route-map PREFER_PATH out
The true secret details to remember is the fact even though numerous BGP characteristics favor a greater worth, the MED is basically an exterior metric – and also a lessen metric is preferred, equally as Together with the protocols you’ve already studied to generate your CCNA certification.