BGP next-hop self benefits
math at sizone.org
Fri Dec 1 15:30:56 CST 2017
On an IX, without next-hop-self peer A leaking peer B's routes they receive to
C will have C send direct to B on the IX (assuming flat layer 3 addressing,
and not multiple little /30s or /96s everywhere or something - do any
exchanges do that?)
This may seem more efficient than sending C's traffic to A to get to B (pumping up
the IX's usage graphs) but B may not have peering agreements with C.
Setting next-hop-self avoids this. An 'advantage' in some views. Not related to
n-h-s in an igp specifically, but an interesting (mis)use case.
On Fri, Dec 01, 2017 at 03:06:34PM +0000, craig washington said:
>Question, what are the true benefits to using the next-hop self feature, doesn't matter what vendor.
>Most information I see is just to make sure you have reach-ability for external routes via IBGP, but what if all your IBGP knows the eBGP links?
>Is there a added benefit to using next hop self in this situation?
>Any feedback is much appreciated, either for the question specifically or whatever else you got ????, L3VPN's or underlying technology that has to have that.
Ken Chase - math at sizone.org Guelph Canada
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