Re:Memory / router required for full BGP table, Dual ISPs
Hello, My first thought is why do you need full BGP routing tables from both ISPs? Typically a default route is sufficient. If you need full routing tables, you would need to look at a much beefier router as you would be looking at somewhere over a million RIB entries between the two ISPs.
If you just take default routes with 10Mb connections, you only need minimal specs for that. The 2800 or an ISR1921 or similar should be sufficient. If you are doing any NAT, firewalling, or QoS on that router, I would bump that up to the ISR2900 series.
Memory / router required for full BGP table, Dual ISPs
If you want to ensure your packets take the most efficient path, then you must get a full BGP route table from each ISP. If you don't need to ensure the best path for every packet, or you can do BGP load sharing with the two ISPs. You could also combine this with communities from each ISP for some better efficiency. In my experience, most times a default route with BGP load sharing is perfecty acceptable, but your particular needs may vary.
Re: Memory / router required for full BGP table, Dual ISPs
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For dual 10 Mbps links, a 1941 or 2901 would be about the minimum, excluding considerations for processing dual full Internet BGP tables.
You might be fine just using defaults to both providers. If you want optimal performance, if platform supports PfR use that. It seems to have much less impact to the device and outbound routing is even "better" than having Internet route tables.
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