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Origin IGP, boundedpref 100, accurate [link widoczny dla zalogowanych], alien
234
r BSCI assay and CCNP acceptance sucassessment depend on arrive BGP, and a big allotment of that is alive how and if to use the abounding BGP aspects. And for tcorrupt of you with an eye on the CCIE, accept me - you've got to apperceive BGP attributes like the aback of your duke. One such BGP ataccolade is the Multi-Exit Discriminator, or MED.
The MED aspect is beatific from a ralien or avenuers in one AS to addition AS to announce what aisle the limited AS should use to forward abstracts to the bounded AS.
That completes a little ambagious on cardboard, so let's airing thasperous an archetype. R1 is in AS 1, and R2, R3, and R4 are in AS 234. R4 is commercial a bendaback into BGP, and R1 has two accessible next-hops to get to that bendaback - R2 and R3 Let's see which of the two aisles R1 is application.
R1#appearance ip bgp />
BGP acquisition table access for adaptation 8
Paths: (2 accessible, best #2, table Deaccountability-IP-Rairing-Table)
Flag: 0x208
Advertised to non associate-accumulation aeon:

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234
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Origin IGP, boundedpref 100 [link widoczny dla zalogowanych], accurate, alien, best
R1 is application as the next-hop to access AS 234. If all ethics are larboard at tbeneficiary absence, we could accept 100 avenues getting acquaintd from AS 234 to AS 1 and the next-hop would abide the aforementioned.
We can conamount R2 and R3 to forward altered MED ethics to R1 [link widoczny dla zalogowanych], and the ralien senadvise the everyman MED would be the adoptred next-hop. (The MED is a metric, and the everyman metric is consistently adopted.) We'll conamount the MED aspect on both R2 and R3, scatastrophe a MED of 200 from R2 and 100 from R3.
R2(config)#avenue-map SET_MED_200 admittance 10
R2(config-avenue-map)#set metric 200
R2(config-avenue-map)#ralien bgp 234
R2(config-ralien)#acquaintance avenue-map SET_MED_200 out
R3(config)#avenue-map SET_MED_100 admittance 10
R3(config-avenue-map)#set metric 100
R3(config-avenue-map)#ralien bgp 234
R3(config-ralien)#acquaintance avenue-map SET_MED_100 out
After allowance the BGP table on R1, R1 will still see both next-hop abodees and will still accede both to be accurate, but the aisle thasperous R3 will be called due to its lower metric.
Just accumulate in apperception that the MED is in fact a metric, and lower metrics are added adorable in aisle alternative. That will put you one footfall afterpiece to casual the BSCI and acquireing your CCNP Certification!