I need configuration help when we configure DHCP on cisco 3650 switch . We have configured DHCP pools for various VLANs on our core switch 3650, and we have two internet links connected to router which is connected to core switch.
We mentioned DNS ip details provided by ISP under DHCP pool statements on core switch which is working fine for ISP 1. But we have taken second ISP link for redundancy , when we give DNS ip addresses provided by ISP 2 under DHCP config on core switch, it is not working when failover occurs.
Internet is not working. How can we configure the device in such way that , if there is failure on ISP 1 link, DHCP settings should take DNS parameters of ISP 2.