Friday, August 21, 2020

Cat9k for WAN edge?

My shop runs EIGRP on our WAN circuits, so we're locked in with Cisco and we're okay with that. We've had pretty good luck with VARs, TAC, feature set, etc.
For our WAN edge, we're currently using ASR1001-X routers. However, they only have 2x10gb and a handful of 1gb interfaces which is a bit limiting. We run the 2x10gb into our redundant leaf switches but that means we can't land any 10gb links directly into the router.
Our requirements are fairly basic. Need to be able to do a couple of VRFs for tenants (yeah, we're starting to hit that point in our maturity), need to be able to do BGP and EIGRP with BFD, need to do some fairly simple QoS shaping, and need a handful of 1/10gb interfaces (25gb+ is a bonus).

We tried deploying a Nexus 9K for this purpose, but we kept running into problems (did you know an ACL on a routed interface on a Nexus 9K can't block multicast? we didn't!), so that's out. Next best options we've come up with are the Cat9Ks, specifically the C9500-16X or the C9500-24Y4C. We have a couple of Cat9500s deployed as a stack handling layer 2 only, stitching firewalls to routers, and have had good luck with them. Anybody have any other experience with the Cat9500s? Anything in particular we should be watching out with?

Our VAR is scheduling a meeting with a Cisco engineer to go over this in more detail, but I figured I'd try to source some input from strangers on the internet as well.



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