Cisco CCNP / BSCI Certification:The BGP Attribute "MED"

When you're preparing to pass the BSCI examination and earn your CCNP certification, one in the biggest challenges is learning BGP.BGP is utterly distinct in the protocol you learned to earn your CCNA certification, and the other from the differences is BGP uses path attributes to favor one path in excess of another when multiple paths to or from your destination exist.
Notice I mentioned "to or from".In earlier free BGP tutorials, I discussed the BGP attributes "weight" and "local preference".These attributes are used to favor one route to a destination about another; one example is, if BGP AS 100 has two paths to a destination in AS 200, these two attributes may be occur AS 100 to favor one path about another.But what if AS 100 wants to express to the routers in AS 200 regarding which path it should really use to achieve a given destination in AS 100?
That's in which the BGP attribute "Multi-Exit Discriminator", or MED, arrives in.The MED value may be placed in AS 100 to express to AS 200 which path it should really use to achieve certain network in AS 100.
As with quite a few BGP attributes, the MED might be set with a route-map.Anything you ought to watch is always that there isn't a "set med" value on how maps.To modify the MED of a path, you need to alter the metric of that path.For instance, if you will discover two entry paths as 200 to make use of to reach destinations in AS 100.You desire AS 200 to implement the 100.1.1.0/24 path above the 100.2.2.0/24 path.First, identify the 2 main paths with two separate ACLs.
R1(config)#access-list 22 permit 100.1.1.0 0.0.0.255
R1(config)#access-list 23 permit 100.2.2.0 0.0.0.255
Next, write a route-map that assigns less metric to the more-desirable path.
R1(config)#route-map PREFER_PATH permit 10
R1(config-route-map)#match ip 22
R1(config-route-map)#set metric 100
R1(config-route-map)#route-map PREFER_PATH permit 20
R1(config-route-map)#match ip address 23
R1(config-route-map)#set metric 250
Finally, apply the route-map towards the neighbor or neighbors.
R1(config-route-map)#router bgp 100
R1(config-router)#neighbor 22.2.2.2 route-map PREFER_PATH out
The selling points to bear in mind is always that while many BGP attributes favor a better value, the MED is essentially another metricand a more affordable metric is preferred, just like together with the protocols you've already studied to earn your CCNA certification.

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