> that's said below. 'do not accept the affected routes' > You want: "Because sending traffic off on a false path causes > pain/suffering/unhappy-packets" > added to the reqs doc?
No, I want to know what it is you intend to accomplish, not how you intend to accomplish it. >> Then you want to know what the policy is in this diagram: > > perhaps 'policy' is overloaded here... I don't care what the bgp > policy is inside someone else's network. they can choose to > accept/deny/up|down-pref announcements to their hearts content. I do > care that, as I said below/before, someone can't invent paths in the > routing table. Policy exists outside an AS, as well. When you set no_export on a route, that's a policy. When you sign a contract saying, "I will peer with you, but I will not allow you to transit my traffic," that's a policy. If you'd like to suggest a different word for contract terms that say things like, "I will peer, but not transit," then lets find the better term. Let's go back to here: A---------B | | +---C-----+ > I want to (for the 2 example paths above, applied to the diagram you > created) be certain that in case 1: > B is not injecting routes with origin-C and as-path that includes > fictional-ASN-D The requirement here is that you don't want fictional AS' in the AS Path. > case 2: > B is not injecting a path with origin-C and as-path that includes the > fictional ASNs D, E, F > > I didn't speculate on the policy of B nor C here, just that the path I > see isn't signed by asn's D E nor F, so they shouldn't be used in this > network. The second point you make is that you don't care if C transits or not in this situation. If you're B, you don't care if C is supposed to transit or not, so long as C doesn't put a fake AS in the AS Path. So the only real requirement you have is that fake AS' not end up in the AS Path. Is that correct? :-) Russ
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