newbie MAC->IP question

[János Löbb <janos.lobb () yale edu>]

Hi,

Looking the Ethernet traffic I see the routers and switches with their ethernet/MAC address.  However they do not show 
up in the IP traffic.  When I look the Ethernet frame, I again see the MAC address, but I do not see its IP address.Can 
Wireshark - or any other program on a Mac - translate a MAC address into an IP ?

I looked at man arp, but I do not see it there either and arp -a do not show the router.

The switches MAC address are in this form:  Cisco_ab:cd:ef  and the routers name are like All-HSRP-routers_6a.

Thanks ahead,

János
P.S.  How can I capture only routers and Switch traffic and ignore all the workstations and vice versa  ?
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