Wired Intelligent Edge

Hello, 

I've been searching for a while and I cannot find this information. I'm looking for that hard limits for the rate of ARP the switch can handle. PPS per port and/or total limit to the CPU.  It's a JL659A, though I'm not sure if it matters. I have been running into the data sheets with the table size, I'm guessing it can have 32k different tables with 49,152 clients?  I'm not really worried about the whole table size.  

What got me here is that I inherited a network and it's pretty flat physically.  My one router is a 2x stack of  FF 5940.  I've got 10 buildings and the WAN links aren't routed to the building as well as my VSAN is connected to this.  What I'm seeing are various errors on it and in my wireless console (mist) of ARP ignored.  the 5940 is telling me I'm over my 200pps limit (hard) on certain ports as CPUCAR errors for CPU flood protection.  Almost all of my wireless clients are Apple Devices, we use Airplay Screen mirroring in every classroom and I'm sure they airdrop a lot.  i bring that up because I don't know why they're doing so many ARP requests at times as most of their resources are online. 

While I should be with the per port limit, I'm also worried about the CPU limit.  I'm not sure if I wrote my plan is to change to routing at the building, so any rate limits would be per concentration switch's uplink to the building router which are 6300m series. 

Asfar I know there is no ARP limit per interface. However, within CX switches, CoPP is used to protect the control-plane.

There are a few different classes for ARP. If needed I can be changed. To show the default values

6300# show copp-policy default
class                 drop priority rate pps burst pkts hardware rate pps
--------------------- ---- -------- -------- ---------- -----------------
acl-logging                0        25       25         25
arp-broadcast              2        1250     1250       1250
arp-protect                2        2075     2075       2075
arp-unicast                3        825      825        825

Use the command 'show copp-policy statistics' to view the statistics and see if the limits are reached.

Wonderful,  thank you very much!  This is good to know in case we do get issues in the controle-plane but I think we won't, it's just too much for our flex fabric switch.  Though we are going to replace it in the coming years, I'd rather route over WAN links anyway. 

6300# show copp-policy defaultclass                 drop priority rate pps burst pkts hardware rate pps--------------------- ---- -------- -------- ---------- -----------------acl-logging                0        25       25         25arp-broadcast              2        1250     1250       1250arp-protect                2        2075     2075       2075arp-unicast                3        825      825        825