Answer for:

Cisco Switches/Stacks and Finding connected devices IP's

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You will only see arp entries if the switch has a layer 3 interface for that vlan. Vlan1 has an ip that is why you see arp entires. For the other vlans you will only see layer2 , mac addresses

Ping the broadcast address of the local LAN and then check the arp cache. this will show you IP.

For example:

3560# ping

3560# show arp