Your BSCI test and CCNP affirmation achievement rely upon acing BGP, and a major piece of that is knowing how and when to utilize the numerous BGP qualities. What's more, for those of you with an eye on the CCIE, trust me - you must know BGP traits like the back of your hand. One such BGP characteristic is the Multi-Leave Discriminator, or Medications.
The Drug characteristic is sent from a switch or switches in one AS to another AS to show what way the remote AS should use to send information to the nearby AS.
That sounds a bit of befuddling on paper, so we should stroll through a model. R1 is in AS 1, and R2, R3, and R4 are in AS 234. R4 is publicizing a loopback into BGP, and R1 has two conceivable next-jumps to get to that loopback - R2 (18.104.22.168) and R3 (22.214.171.124). We should see which of the two ways R1 is utilizing.
R1#show ip bgp 126.96.36.199
BGP steering table passage for 188.8.131.52/32, form 8
Ways: (2 accessible, best #2, table Default-IP-Directing Table)
Publicized to non peer-bunch peers:
184.108.40.206 from 220.127.116.11 (18.104.22.168)
Birthplace IGP, localpref 100, legitimate, outer
22.214.171.124 from 126.96.36.199 (188.8.131.52)
Birthplace IGP, localpref 100, legitimate, outer, best
R1 is utilizing 184.108.40.206 as the following jump to enter AS 234. In the event that all qualities are left at their default, we could have 100 courses being promoted from AS 234 to AS 1 and the following bounce would continue as before.
We can arrange R2 and R3 to send diverse Drug esteems to R1, and the switch sending the most reduced Medications would be the favored next-jump. (The Medications is a measurement, and the most minimal measurement is constantly liked.) We'll design the Drug characteristic on both R2 and R3, sending a Prescription of 200 from R2 and 100 from R3.
R2(config)#route-map SET_MED_200 license 10
R2(config-course map)#set metric 200
R2(config-course map)#router bgp 234
R2(config-router)#neighbor 220.127.116.11 course map SET_MED_200 out
R3(config)#route-map SET_MED_100 license 10
R3(config-course map)#set metric 100
R3(config-course map)#router bgp 234
R3(config-router)#neighbor 18.104.22.168 course map SET_MED_100 out
In the wake of clearing the BGP table on R1, R1 will at present observe both next-jump addresses will in any case believe both to be legitimate, yet the way through R3 will be chosen because of its lower metric.
Simply remember that the Drug is really a measurement, and lower measurements are increasingly alluring in way determination. That will put you one bit nearer to passing the BSCI and procuring your CCNP Accreditation!
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