I have two questions:
What are the repercussions of configuring loopback interfaces on routers running in full production with various routing protocol i.e. EIGRP & OSPF.
If there are, is there a way that we may avoid those issues and still be able to configure virutal interfaces on Cisco devices without impacting business.
Looking forward to your prompt respones.
A well configured OSPF network, would have a router-id under the OSPF process to avoid this kind of issues.
Creating the loopback interface won't make any impact on the ongoing traffic..... It won't make any difference until you advertise in any of routing protocol.... Even advertising this, will provide way for other routers to reach this thro. that loopback ip.... Nothing much to do on the ongoing traffic until you make any wrong configuration.