HP Switch ARP – HP 1920 ARP Limit

arpswitch

I am not a network engineer, I have very limited knowledge.

background:

We currently have a HP1920-48g switch + others around our building. Originally these were "daisy chainned", the new I.T Director changed this into what he describes as a "spider" like configuration (totally not a tech term im thinking).

Issue:

We have just installed a new telephone IP system, which works with a little computer software called "navigate" recently people coming in later to the building trying to access this would result in a long wait untill there settings loaded etc.

Now we have traced this to a issue with the switch reaching 256 limit in the ARP table.

Question:

Can we increase this limit, ither purchase a new switch (rather not but understand if we must).

Or can we set up something to increase the limit somehow? Unfortunatly I have very little network knowledge. We played around with turning of the Gratuitous ARP but not really sure that we should do this.

Best Answer

Are you sure this has anything to do with ARP? The 1920 is a layer2 switch and doesn't need to do any ARP.

I'd suspect it has more to do with the subnet size especially the DHCP scope. Once IP address allocation is exhausted - which for the most common /24 subnet size is 256 (or rather 254), you need to enlarge the network. If you've just got this single subnet it's not too hard to do.

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