Could you please tell me why would we use Two IP Addresses for an Interface - Primary and Secondary IP ?
Please explain scenarios, Advantages & Limitations ?
Thanks in Advance,
Prasanna Kumar Desireddy
please see these links
generally more disadvantages than advantages!
As Mark has noted, secondaries can be very handy for network (prefix) migrations.
BTW, by default, Cisco devices, when using IP helpers, will only forward the primary IP.