When you’re preparing to go the BSCI exam and generate your CCNP certification, one of the most significant challenges is Studying BGP. BGP is completely unique from any protocol you discovered to gain your CCNA certification, and among the list of variations is BGP uses route attributes to favor just one route about A different when several paths to or from the destination exist.
Detect I reported “to or from”. In previously absolutely free BGP tutorials, I talked over the BGP characteristics “fat” and “regional desire”. These characteristics are utilized to favor 1 path into a http://query.nytimes.com/search/sitesearch/?action=click&contentCollection®ion=TopBar&WT.nav=searchWidget&module=SearchSubmit&pgtype=Homepage#/먹튀검증 vacation spot in excess 먹튀사이트 of An additional; one example is, if BGP AS 100 has two paths into a vacation spot in AS 200, these two characteristics can be established in AS 100 to favor one particular path more than An additional. But what if AS 100 desires to inform the routers in AS 200 concerning which path it should really use to succeed in a supplied destination in AS a hundred?
That’s in which the BGP attribute “Multi-Exit Discriminator”, or MED, is available in. The MED benefit could be established in AS 100 to tell AS two hundred which path it must use to achieve a supplied community in AS a hundred.
Just like quite a few BGP characteristics, the MED might be established with a route-map. What you must observe is that there's no “set med” benefit in route maps. To change the MED of a path, you might want to alter the metric of that path. Enable’s say that there are two entry paths for AS 200 to work with to reach destinations in AS one hundred. You need AS 200 to use the a hundred.1.one.0/24 route in excess of the a hundred.2.2.0/24 route. First, determine The 2 paths with two separate ACLs.
R1(config)#accessibility-list 22 allow a hundred.1.one.0 0.0.0.255
R1(config)#obtain-checklist 23 allow 100.2.two.0 0.0.0.255
Up coming, 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 address 22
R1(config-route-map)#established metric 100
R1(config-route-map)#route-map PREFER_PATH allow 20
R1(config-route-map)#match ip deal with 23
R1(config-route-map)#set metric 250
Lastly, implement the route-map to the neighbor or neighbors.
R1(config-route-map)#router bgp a hundred
R1(config-router)#neighbor 22.2.two.2 route-map PREFER_PATH out
The real key factors to keep in mind is always that while quite a few BGP attributes want a higher value, the MED is largely an external metric – along with a decrease metric is preferred, equally as Using the protocols you’ve previously studied to make your CCNA certification.