I am about to turn up a new eyeball network. ASN and IPs all sorted. Primary and secondary upstream selected. Local IXP with the usual suspects. More at a larger IXP less than 10 ms away.
Looking at routers it struck me: do I actually need full tables for this network?
Taking a default is simple. Simple is good. And I don't have to worry about routing table growth. Plus it doesn't hurt that this expands my options for edge routers and possibly lowers my price points.
The obvious cons are risk of asymmetric routing, no ASN information in flows and uRPF probably won't be as useful. The asymmetric routing issue is lessened by the fact that the IXP routes will take a good chunk of traffic and that the primary upstream would be the default choice for outgoing traffic most of the time anyway.
There are no BGP customers. For the sake of the argument, assume there won't ever be either.
What am I missing? I'm trying to let go of my preconceived notions and challenge my assumptions.
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