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Layer 2 arp

Is it possible to see the ip addresses of PCs that are connected to a switch that is doing layer 2.e.g a catalyst 2950 switch as you can see when you do "show ip arp or show arp " on a layer 3 switch or router ?

  • Other Network Infrastructure Subjects
1 REPLY
Cisco Employee

Re: Layer 2 arp

Hi,

Unfortunately no. Since the default gateway for the connected hosts will be on another switch or router, the 2950 will only maintain a mac-address-table of connected hosts.

If the management IP is in the same VLAN as the clients, if you know the range of IPs, you can ping them from the switch to generate an ARP, and then cross reference the ARP entries with the mac-address-table, but this is extremely cumbersome, if even possible.

Your best bet is to get the IP to MAC pairings from the default gateway, and check that against the MAC table on the 2950.

HTH,

Bobby

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