You are likely going to have a lot of problems with IPv6 depending on how big of an ARP table your router can support. We are currently evaluating our next gen platform for routing on campus, and with many of us having very large subnet spaces to enable wireless mobility, you are going to see a lot of issues with tables sizes with IPv6. For that reason, we aren’t going to touch IPv6 with a ten foot pole on wireless anytime soon (we currently run IPv6 selectively across campus). We are currently experiencing significant drops (ARP and DHCP) on an older 6509 platform that routes main campus wireless. We have exceeded the 32k recommended ARP table size, and it is showing. We are migrating our largest VLAN to a different router with more head room (64k) until we figure out where we go next with the architecture.
So, I think you are likely going to be needing to upgrade your hardware if you have large SVIs for wireless. There is some debate about this depending on what vendor we talk to, but the next gen Broadcom chipset is ‘supposed’ to support over 700k ARP table size. Ryan Turner Manager of Network Operations ITS Communication Technologies The University of North Carolina at Chapel Hill [email protected]<mailto:[email protected]> +1 919 445 0113 Office +1 919 274 7926 Mobile From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[email protected]] On Behalf Of Dave Soltis Sent: Friday, September 9, 2016 2:00 PM To: [email protected] Subject: [WIRELESS-LAN] IPv6 issues Good afternoon, Has anybody had any experience with turning on IPv6 for a mid-large size University. We turned up IPv6 during the summer and had no issues, but the first day of classes where we saw 30,000 concurrent devices we had issues with the upstream routers routing table exceeded(128k) and very high CPU. We have 5 Wism Blades in a 6513VSS HA Configuration. Maybe we need to distribute ? or upgrade hardware ? Any insights/suggestions would be much appreciated. Thanks -- Dave Soltis Wireless Network Analyst Information Services and Technology University of Alberta Ph.7804923144 ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/<https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fwww.educause.edu%2fgroups%2f&data=01%7c01%7crhturner%40email.unc.edu%7c51e29f36d6c94f86f29c08d3d8db42d3%7c58b3d54f16c942d3af081fcabd095666%7c1&sdata=P%2bPusNYbB23wAjf2g2JrmQqbUG8BdfsFVdO7DseKxIg%3d>. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
