My question is, would I be better off, peering each of my data center routers with one provider and the other two data center routers instead of each data center router peering with all three providers over a shared Layer-2 VLAN? Below are the details of connectivity.
I am about to deploy new equipment for our internet edge(s). We have acquired a couple companies in the past 2 years and some of the equipment is inadequate at best.
We have three different data centers, each with one different provider directly connected. We have dark fiber between the data centers and have a number of spanned VLANs, including 1 for each provider. Today, each location peers with all three providers, the local provider and the other two on a shared VLAN. Each provider interface is on a /29. I am considering peering Router A in datacenter A with provider A and with routers B and C, then Router B, peers with provider B and with routers A and C, likewise for Router C.
A secondary question that was brought to mind by reading through the comments on other BGP posts is am I better off running iBGP between the routers and using one ASN for everything, or keeping the three separate ASNs and peering between them. Today, each DC is the remnant of a former independent org and advertises its own prefixes on its own AS, prepending that AS on any non-local peer to lower the preference for that route.
I know how to do each of these, I'm just looking for some insight from experience on which is better and why.
Thank you for your opinions.
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