I need advice urgently.
I have 3 routers.When I configure primary and secondary ip addresses on a single physical interface,
I do not want to use sub-interfaces because I will have to buy an additional switch.
Q1) Is it true that at any point in time, only one of the ip address is in use?
In other words, if primary address is in used, then the secondary ip address cannot be used?
Scenario: I have 3 routers, 1 router is configured with primary and secondary ip address on a single FE interface. The other 2 routers are configured normally with 1 ip address per FE interface.
Router2 is connected to router1 via router1's primary ip address.
Router3 is connected to route1 via router1's secondary ip address.
Problem1: I discover that I can ping from router1 to router2 and vice versa.
But I can only ping from router3 to router1's ip address, but not from router1 to router3.
Q2)Is it because it is secondary ip address that router1 cannot ping to router3?
Q3) I also discover that my ospf routes are distributed only through the primary address of router1 but not the secondary address of router1.
Pls advice how I can resolve all my above problems