Any time you’re getting ready to move the BSCI Test and get paid your CCNP certification, one of the largest worries is Mastering BGP. BGP is totally unique from any protocol you uncovered to gain your CCNA certification, and one of many differences is that BGP utilizes route characteristics to favor just one path in excess of another when many paths to or from a place exist.
Observe I claimed “to or from”. In before absolutely free BGP tutorials, I discussed the https://www.washingtonpost.com/newssearch/?query=토토사이트 BGP attributes “excess weight” and “neighborhood desire”. These attributes are accustomed to favor a person path to a spot above A further; by way of example, if BGP AS a hundred has two paths to your place in AS 200, both of these characteristics is usually established in AS a hundred to favor 1 path more than An additional. But Imagine if AS one hundred desires to inform the routers in AS two hundred as to which route it should use to reach a provided location in AS one hundred?
That’s where the BGP attribute “Multi-Exit Discriminator”, or MED, is available in. The MED worth could be set in AS 100 to inform AS two hundred which route it should really use to succeed in a specified network in AS 100.
As with lots of BGP attributes, the MED could be set with a route-map. What you must check out is that there's no “set med” benefit in route maps. To alter the MED of a path, you need to alter the metric of that route. Allow’s say that there are two entry paths for AS two hundred to work with to succeed in Locations in AS one hundred. You desire AS 200 to make use of the one hundred.one.one.0/24 route more than the 100.two.two.0/24 path. To start with, establish the two paths with two separate ACLs.
R1(config)#access-list 22 permit 100.one.one.0 0.0.0.255
R1(config)#access-checklist 23 allow 100.2.2.0 0.0.0.255
Following, create a route-map that assigns a decrease 스포츠토토사이트 metric to the more-appealing route.
R1(config)#route-map PREFER_PATH allow ten
R1(config-route-map)#match ip tackle 22
R1(config-route-map)#established metric 100
R1(config-route-map)#route-map PREFER_PATH allow twenty
R1(config-route-map)#match ip deal with 23
R1(config-route-map)#established metric 250
Ultimately, implement the route-map into 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 real key factors to remember is when quite a few BGP characteristics prefer the next price, the MED is essentially an external metric – and also a lessen metric is preferred, just as Together with the protocols you’ve already examined to generate your CCNA certification.