We currently run a Cisco 6509 with Sup-720 10G as a combined core and border for our 4,000-user campus (one location, all 10G interconnects between buildings). All L3 gateways terminate on this core; we don't do anything fancy like MPLS or VXLAN. We have the usual mix of Internet traffic and need to support large data set transfers by our researchers. We are IPv6-enabled and have 3x10G connections to the Internet; we take default routes for the Internet and about 100k Internet2 routes. We would like to replace the (single) 6509 with pair of devices and retain the combined core-border functionality. Aggregation will be handled by a set of whitebox switches running Cumulus Linux, dually connected to the core-border.
Options we've considered include a 1) a pair of Nexus 7702 chassis, with enough 40G ports to link to the aggregation switches; and 2) a pair of Nexus 93240YC-FX2s. We are worried that both don't have deep enough packet buffers for our large data transfers to exceed what we can currently do on the 6509.
What do you think of these options? What other options should we consider? We are really interested in a full Cumulus environment, but I think it may be too early at this point (at least handling 100k routes at the border).
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