Whenever you’re getting ready to go the BSCI Test and receive your CCNP certification, amongst the most important issues is learning BGP. BGP is completely various from any protocol you acquired to generate your CCNA certification, and one of several variations is BGP works by using route characteristics to favor one route above another when multiple paths to or from a location exist.
Discover I mentioned “to or from”. In earlier no cost BGP tutorials, I reviewed the BGP characteristics “excess weight” and “community preference”. These attributes are utilized to favor one particular path to the place over A further; for example, if BGP AS a hundred has two paths to a place in AS 200, both of these characteristics may be set in AS a hundred to favor one particular path about An additional. But Let's say AS one hundred desires to tell the routers in AS 200 concerning which path it ought to use to achieve a supplied place in AS one hundred?
That’s where the BGP attribute “Multi-Exit Discriminator”, or MED, is available in. The MED value may be established in AS 100 to tell AS 200 which route it ought to use to achieve a provided network in AS a hundred.
Just like quite http://www.bbc.co.uk/search?q=먹튀검증 a few BGP characteristics, the MED is usually established using a route-map. What you have to check out is that there is no “set med” value in route maps. To change the MED of the route, you'll want to alter the metric of that path. Allow’s say that there are two entry paths for AS two hundred to implement to succeed in destinations in AS a hundred. You'd like AS 200 to utilize the one hundred.1.1.0/24 path about the one hundred.two.two.0/24 path. Very first, establish the 토토검증 two paths with two independent ACLs.
R1(config)#access-list 22 permit a hundred.1.one.0 0.0.0.255
R1(config)#entry-listing 23 allow a hundred.two.two.0 0.0.0.255
Subsequent, create a route-map that assigns a lower 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 allow 20
R1(config-route-map)#match ip deal with 23
R1(config-route-map)#established metric 250
Finally, utilize the route-map towards the neighbor or neighbors.
R1(config-route-map)#router bgp one hundred
R1(config-router)#neighbor 22.two.2.two route-map PREFER_PATH out
The main element factors to bear in mind is the fact that even though numerous BGP characteristics favor an increased worth, the MED is basically an external metric – plus a reduce metric is chosen, just as While using the protocols you’ve presently examined to gain your CCNA certification.
