DHCP relay agent


It is possible to configure multiple [DHCP relay agent](/dhcp-relay-agent)s on a single interface using the `ip helper-address` command like so:

```
interface GigabitEthernet0/1
 ip address 192.168.13.3 255.255.255.0
 ip helper-address 10.10.10.55
 ip helper-address 20.20.20.55
```

In such a case, DHCPDISCOVER messages are sent to all the helper addresses configured on the interface.  The client will obtain IP addressing information from whichever DHCP server responds first.  It's a similar situation to having two DHCP servers on the same subnet.  It's not ideal, as this can increase DHCP traffic on a network, but it is doable.

Links:

https://www.cisco.com/c/en/us/support/docs/ip/dynamic-address-allocation-resolution/27470-100.html

DHCP multiple IP helper-addresses

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DHCP multiple IP helper-addresses

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