After you’re making ready to go the BSCI exam and get paid your CCNP certification, among the largest troubles is learning BGP. BGP is totally distinctive from any protocol you uncovered to earn your CCNA certification, and one of many dissimilarities is the fact BGP employs route characteristics to favor just one path around A different when numerous paths to or from a location exist.
Observe I reported “to or from”. In before free BGP tutorials, I reviewed the BGP characteristics “body weight” and “nearby preference”. These attributes are accustomed to favor a single path to your destination more than A further; for example, if BGP AS one hundred has two paths to the destination in AS 200, both of these attributes may be set in AS 100 to favor just one path over another. But Imagine if AS a hundred needs to tell the routers http://www.bbc.co.uk/search?q=토토사이트 in AS 200 regarding which path it must use to reach a supplied place in AS 100?
That’s wherever the BGP attribute “Multi-Exit Discriminator”, or MED, comes in. The MED value might be set in AS one hundred to inform AS 200 which route it need to use to achieve a offered network in AS 100.
Just like quite a few BGP attributes, the MED is often set having a route-map. What you have to watch is that there's no “established med” price in route maps. To alter the MED of the route, you'll want to alter the metric of that path. Let’s say that there are two entry paths for AS two hundred to use to succeed in destinations in AS one hundred. You'd like AS 200 to use the a hundred.1.1.0/24 route above the one hundred.2.two.0/24 path. To start with, recognize The 2 스포츠토토사이트 paths with two independent ACLs.
R1(config)#access-listing 22 allow one hundred.one.1.0 0.0.0.255
R1(config)#obtain-list 23 permit 100.2.2.0 0.0.0.255
Upcoming, produce a route-map that assigns a lessen metric to the greater-fascinating route.
R1(config)#route-map PREFER_PATH allow 10
R1(config-route-map)#match ip handle 22
R1(config-route-map)#set 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
Ultimately, implement the route-map towards the neighbor or neighbors.
R1(config-route-map)#router bgp one hundred
R1(config-router)#neighbor 22.two.two.two route-map PREFER_PATH out
The crucial element factors to keep in mind is the fact though quite a few BGP attributes prefer an increased worth, the MED is largely an external metric – plus a decreased metric is favored, just as While using the protocols you’ve currently examined to receive your CCNA certification.