I have alot of Arp's in my network. Currently I have a Catalyst 3500 XL connected to another 3500 XL via two fiber ports. Is there a way I can cut down on the amount of arp broadcasting? If not is there a way I can keep the broadcasts in the local switch? I have toyed with the idea of adding subnets or vlan's, but adding a router would be impratical at this time.
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alot of arps 1
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If you don't segment the network then the broadcasts will flow as they are now. Also, even if you do implement VLANs the broadcasts will still flow between switches if you extend the VLANs between them. Another option besides segmentation is static arp mappings, but I don't think you'll like that very much.
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tjbradford
Technical User
I have come across this in the past and it turned out that it was due to the local network not having a default gateway, the users could browse then lan and access the internet via a proxy so it was never noticed , however there was a default gateway configured but it never existed, this generated alot of arp requests.
that said i think 254 hosts per subnet is good pratice, if your brave you can up it to 512 addresses per subnet but where possible keep it to 254 or less
that said i think 254 hosts per subnet is good pratice, if your brave you can up it to 512 addresses per subnet but where possible keep it to 254 or less
VinceWhirlwind
Technical User
You could look at greatly increasing the ARP timrout period on your switches.
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