Once you’re preparing to pass the BSCI exam and earn your CCNP certification, considered one of the biggest difficulties is Discovering BGP. BGP is completely diverse from any protocol you acquired to make your CCNA certification, and one of the variances is BGP makes use of route characteristics to favor just one route about A different when a number of paths to or from the spot exist.
Detect I claimed “to or from”. In earlier free BGP tutorials, I discussed the BGP attributes “body weight” and “neighborhood desire”. These characteristics are utilized to favor http://www.bbc.co.uk/search?q=토토사이트 just one route into a desired destination more than A further; as an example, if BGP AS a hundred has two paths to your vacation spot in AS two 사설토토 hundred, these two characteristics might be established in AS 100 to favor 1 route about Yet another. But Let's say AS one hundred needs to tell the routers in AS 200 as to which route it really should use to reach a given place in AS 100?
That’s the place the BGP attribute “Multi-Exit Discriminator”, or MED, is available in. The MED price may be set in AS a hundred to tell AS two hundred which path it really should use to reach a offered community in AS one hundred.
As with several BGP attributes, the MED can be established that has a route-map. What you might want to observe is that there is no “set med” value in route maps. To alter the MED of the route, you need to alter the metric of that route. Permit’s say there are two entry paths for AS two hundred to implement to reach Places in AS a hundred. You would like AS 200 to use the 100.1.one.0/24 path more than the 100.two.2.0/24 path. Initially, determine The 2 paths with two separate ACLs.
R1(config)#accessibility-list 22 allow 100.1.1.0 0.0.0.255
R1(config)#accessibility-checklist 23 allow a hundred.2.two.0 0.0.0.255
Upcoming, create a route-map that assigns a decrease metric to the greater-fascinating path.
R1(config)#route-map PREFER_PATH allow 10
R1(config-route-map)#match ip deal with 22
R1(config-route-map)#established metric one hundred
R1(config-route-map)#route-map PREFER_PATH permit 20
R1(config-route-map)#match ip handle 23
R1(config-route-map)#established metric 250
Last but not least, implement the route-map to your 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 important thing factors to bear in mind is the fact when lots of BGP attributes want a better value, the MED is largely an exterior metric – plus a lessen metric is favored, just as While using the protocols you’ve presently analyzed to generate your CCNA certification.