Any time you’re preparing to move the BSCI exam and generate your CCNP certification, one among the greatest issues is Discovering BGP. BGP is completely unique from any protocol you figured out to get paid your CCNA certification, and on the list of discrepancies is the fact that BGP employs route attributes to favor one path about One more when a number of paths to or from a destination exist.
Observe I said “to or from”. In previously no cost BGP tutorials, I discussed the BGP characteristics “excess weight” and “neighborhood preference”. These attributes are utilized to favor a person path to your desired destination over One more; by way of example, if BGP AS a hundred has two paths to some place in AS two hundred, these two attributes might be set in http://edition.cnn.com/search/?text=먹튀검증 AS one hundred to favor just one path around One more. But what if AS a hundred desires to tell the routers in AS two hundred as to which path it should really use to succeed in a presented spot in AS one hundred?
That’s wherever the BGP attribute “Multi-Exit Discriminator”, or MED, comes in. The MED price 안전놀이터 might be established in AS 100 to tell AS 200 which route it should really use to reach a provided community in AS one hundred.
As with numerous BGP characteristics, the MED could be established having a route-map. What you should observe is that there's no “set med” value in route maps. To alter the MED of a route, you should alter the metric of that route. Permit’s say that there are two entry paths for AS 200 to implement to succeed in Places in AS a hundred. You wish AS 200 to utilize the a hundred.one.1.0/24 route around the 220.127.116.11/24 route. First, determine the two paths with two independent ACLs.
R1(config)#access-checklist 22 allow one hundred.one.1.0 0.0.0.255
R1(config)#obtain-checklist 23 allow 100.two.2.0 0.0.0.255
Subsequent, generate a route-map that assigns a decreased metric to the more-appealing path.
R1(config)#route-map PREFER_PATH allow 10
R1(config-route-map)#match ip deal with 22
R1(config-route-map)#established metric a hundred
R1(config-route-map)#route-map PREFER_PATH allow 20
R1(config-route-map)#match ip address 23
R1(config-route-map)#established metric 250
Lastly, utilize the route-map on the neighbor or neighbors.
R1(config-route-map)#router bgp a hundred
R1(config-router)#neighbor 22.two.two.two route-map PREFER_PATH out
The real key factors to keep in mind is the fact that whilst quite a few BGP characteristics choose the next worth, the MED is basically an external metric – and also a lower metric is favored, equally as Together with the protocols you’ve now analyzed to get paid your CCNA certification.