I just started a new job. We have few switches which have multiple subnets. I have to redesign and install new switches to replace old switches. Looking into switch configuration files, I can see which ports are assign to which Vlan, but since it's layer2, don't know which ip subnetting is assign to which Vlan for the different group devices. It's very hard to trace cables to devices. What I would like to know how to display arp table in SuSE linux, so that I can see ip-mac mapping, and then by switch port mac address, can find out which ports are assign to which subnet. I know in windows one can ping ip number and then display arp table by using arp -a command to see ip-mac mapping, means rarp. I am new to linux and would like to know if there is any command that would display all arp entries, and also how to get those entries into arp table. Basically I know mac-addresses and would like to know ip-addresses.
Your help will be appreciated.