Any time you’re preparing to move the BSCI Test and earn your CCNP certification, one of the largest issues is Studying BGP. BGP is completely various from any protocol you acquired to generate your CCNA certification, and one of several variances is usually that BGP takes advantage of path characteristics to favor a person path over A further when several paths to or from a vacation spot exist.
Discover I reported “to or from”. In before cost-free BGP tutorials, I mentioned the BGP attributes “fat” and “local choice”. These attributes are used to favor just one path to some vacation spot over Yet another; for instance, if BGP AS 100 has two paths to a place in AS two hundred, these two attributes is usually established in AS a hundred to favor a person route in excess of An additional. But what if AS a hundred would like to tell the routers in AS two hundred regarding which route it need to use to succeed in a provided vacation spot in AS a hundred?
That’s exactly where the BGP attribute “Multi-Exit Discriminator”, or MED, is available in. The MED value is often set in AS one hundred to tell AS https://en.search.wordpress.com/?src=organic&q=먹튀검증 two hundred which route it ought to use to succeed in a presented community in AS one hundred.
Just like a lot of BGP attributes, the MED might be established using a 토토검증 route-map. What you might want to watch is that there's no “established med” price in route maps. To alter the MED of the path, you must alter the metric of that path. Enable’s say that there are two entry paths for AS two hundred to use to achieve Places in AS 100. You need AS two hundred to make use of the a hundred.one.one.0/24 route more than the 100.two.2.0/24 path. First, recognize The 2 paths with two separate ACLs.
R1(config)#access-list 22 allow 100.1.one.0 0.0.0.255
R1(config)#accessibility-listing 23 permit a hundred.2.2.0 0.0.0.255
Subsequent, generate a route-map that assigns a decrease metric to the more-fascinating path.
R1(config)#route-map PREFER_PATH permit 10
R1(config-route-map)#match ip tackle 22
R1(config-route-map)#set metric one hundred
R1(config-route-map)#route-map PREFER_PATH permit 20
R1(config-route-map)#match ip tackle 23
R1(config-route-map)#set metric 250
Finally, use the route-map for 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 main element details to remember is the fact though a lot of BGP attributes like an increased price, the MED is largely an exterior metric – in addition to a reduce metric is favored, just as Together with the protocols you’ve by now studied to gain your CCNA certification.