On the test I use the Cisco Catalyst 6509-E with WS-SUP720-3BXL control module installed.
There is a second similar control module WS-SUP720-3BXL.
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Configuring DHCP relay on Cisco
On the test, I’ll take the Cisco Catalyst 6509-E switch and configure it to forward DHCP packets to the DHCP server.
The switch is configured as L3 with assigned IP addresses in each VLAN.
Connect to the switch through the console or telnet and go to the configuration mode:
enable configure t
Let’s assume the DHCP server address is 192.168.11.1 and we want to configure the transfer of DHCP broadcast packets to it on VLAN 100, for this we execute the commands:
interface Vlan100 ip helper-address 192.168.11.1 exit
Exit the configuration mode and save the configuration:
exit write
Done.
How to view ARP and MAC addresses on Cisco
Here is an example of searching ARP records for mac address:
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