After you’re getting ready to go the BSCI exam and generate your CCNP certification, among the most important difficulties is Finding 사설사이트 out BGP. BGP is completely different from any protocol you uncovered to generate your CCNA certification, and among the list of differences is that BGP makes use of path characteristics to favor 1 route above another when several paths to or from the spot exist.
Recognize I said “to or from”. In previously totally free BGP tutorials, I discussed the BGP attributes “pounds” and “area desire”. These attributes are utilized to favor one route to a place about A different; by way of example, if BGP AS one hundred has two paths to the spot in AS two hundred, these two characteristics is often established in AS one hundred to favor a single route above An additional. But Let's say AS one hundred wishes to tell the routers in AS two hundred regarding which path it must use to succeed in a supplied spot in AS 100?
That’s wherever the BGP attribute “Multi-Exit Discriminator”, or MED, comes in. The MED worth is often set in AS one hundred to tell AS two hundred which path it really should use to succeed in a specified community in AS a http://www.bbc.co.uk/search?q=토토사이트 hundred.
Just like a lot of BGP attributes, the MED is often established having a route-map. What you have to watch is that there is no “established med” benefit in route maps. To change the MED of a path, you should change the metric of that route. Let’s say that there are two entry paths for AS two hundred to make use of to achieve Locations in AS 100. You want AS two hundred to make use of the a hundred.one.one.0/24 path around the 100.two.2.0/24 route. First, identify the two paths with two independent ACLs.
R1(config)#obtain-record 22 permit a hundred.one.1.0 0.0.0.255
R1(config)#accessibility-list 23 permit 100.two.two.0 0.0.0.255
Future, create a route-map that assigns a decreased metric to the more-desirable path.
R1(config)#route-map PREFER_PATH allow ten
R1(config-route-map)#match ip tackle 22
R1(config-route-map)#set metric 100
R1(config-route-map)#route-map PREFER_PATH allow 20
R1(config-route-map)#match ip handle 23
R1(config-route-map)#established metric 250
Lastly, utilize the route-map on the neighbor or neighbors.
R1(config-route-map)#router bgp 100
R1(config-router)#neighbor 22.two.two.two route-map PREFER_PATH out
The crucial element factors to keep in mind is always that whilst quite a few BGP attributes choose an increased price, the MED is largely an exterior metric – in addition to a lessen metric is preferred, equally as Together with the protocols you’ve now analyzed to generate your CCNA certification.