Any time you’re getting ready to go the BSCI Examination and gain your CCNP certification, among the greatest issues is learning BGP. BGP is completely distinct from any protocol you learned to earn your CCNA certification, and one of many differences is the fact BGP takes advantage of path attributes to favor just one path about An additional when multiple paths to or from the vacation spot exist.
See I explained “to or from”. In before absolutely free BGP tutorials, I talked about the BGP attributes “pounds” and “nearby choice”. These attributes are accustomed to favor a person path into a vacation spot in excess of another; by way of example, if BGP AS one hundred has two paths to some vacation spot in AS 200, both of these characteristics may be established in AS 100 to favor just one route around another. But Imagine if AS one hundred desires to inform the routers in AS two hundred concerning which path it should really use to reach a offered place in AS a hundred?
That’s where by the BGP attribute “Multi-Exit Discriminator”, or MED, comes in. The MED value is often established in AS 100 to inform AS two hundred which route it need to use to achieve a given community in AS a hundred.
As with a lot of BGP characteristics, the MED is usually set using a route-map. What you must view is that there's no “set med” value in route maps. To alter the MED of a route, you'll want to alter the metric of that path. Let’s say there are two entry paths for AS 200 to implement to achieve destinations in AS a hundred. You need AS 200 to use the 100.one.1.0/24 path more than the a hundred.two.two.0/24 route. To start with, determine the two paths with two separate ACLs.
R1(config)#accessibility-listing 22 permit one hundred.one.one.0 0.0.0.255
R1(config)#obtain-listing 23 allow a hundred.2.2.0 0.0.0.255
Up coming, compose a route-map that assigns a reduce metric to https://en.search.wordpress.com/?src=organic&q=먹튀검증 the greater-appealing path.
R1(config)#route-map PREFER_PATH allow ten
R1(config-route-map)#match ip address 22
R1(config-route-map)#set metric one hundred
R1(config-route-map)#route-map PREFER_PATH allow 20
R1(config-route-map)#match ip address 23
R1(config-route-map)#set metric 250
Ultimately, use the route-map into 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 real key points to keep in mind is always that while several BGP characteristics desire a greater price, the MED is essentially an exterior metric – and also a reduced metric is most well-liked, just as With all the protocols 먹튀검증업체 you’ve by now analyzed to gain your CCNA certification.