BGP: Difference between revisions
→MED vs Local Preference
Line 370:
neighbor 4.4.4.4 peer-group IBGP_PEERS
= MED vs Local Preference vs Weight =
;Multi-Exit Discriminator
Line 384:
*Routers within the local AS are told what path to use to exit that AS.
*The local preference value is passed only among iBGP peers, and this value never leaves the local AS.
*Weight is configured for Outgoing direction:
[R1]-------[R2]
|
|--------[R3]
If you want R1 to prefer R3, Configure more weight on R1
Configured on Per-Neighbor basis.
* Local Preference is configured in Incoming direction.
Configure Local Pref R3 so that R1 will prefer routes learned via R3.
Local Pref stays inside AS only(use MED if you want to affect AS also).
Configured for the whole BGP process on the router.
;Weight:
Cisco Proprietary
;Example
<--AS3--> <--AS100-->
|------[R2]--------[R4]
[R1] |
|------[R3]--------[R5]
Weight R1 to R2 or R3:
|------>
Local Preference R2 to R1 or R3 to R1:
<------|
MED R4 to R2 or R5 to R3:
|--------->
<br />
| |||