Hi,
we are in process of building new site, where we have 2 different ISPs, that we have BGP peering with. One of them (ISP1) setup Local Preference for our BGP neighbors, which effectively force the traffic to our prefixes that arrives to their AS use their exit point to our site. If we want to engineer inbound traffic with AS prepending, it has no effect (again, only for this ISP ASN), as LP parameter is more important.
Now, that applies only for this ISP1 AS, but as it's major local Internet and mobile provider (Tier 2 ISP), there is a good chance, that majority of our clients will be connected only to their network. If we want to go around this ISP1 and use the second one, we can influence our outbound traffic, but returning traffic from clients connected to ISP1 only will always ISP1 exit point to us, resulting in asymetric routing.
I talked about that with ISP and they made very clear, that they will NOT route our traffic to some upstream and if want to use different provider, we should stop advertising the prefixes to them.
While that is an option, it's not a good one, in case of failover manual intervention is required etc..
Is this normal? I would expect they will be "neutral" and let us engineer or own traffic as we see fit.
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