I know that these do basically the same thing, except you can do more than to vlan's with a router on a stick. Is there any difference in productivity or anything between the two?
I'm not sure why you would ever want to use a secondary ip vs ROAS if you're goal is to route between subnets. How do you plan on assigning IP to your hosts when using seocndary IP? You can't really use DHCP since all the hosts are on one VLAN, yet needs different subnet assignments.
I've never worked with it, but a secondary address implementation seems like a nightmare to troubleshoot
I know that these do basically the same thing, except you can do more than to vlan's with a router on a stick. Is there any difference in productivity or anything between the two?
Not sure what you mean by "do the same thing". The ROAS is primarily for VLANs (different subnets) and would need the dot1q encapsulation to work.
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I've seen secondary IP's used for various reasons on a production network, the main use we have for them now is on the Cisco 10k's. The IP's are set up in several bundle groups as secondary IP's and the bundle group is assigned to the cable interfaces. So you may have 40 secondary subnet's that the cable modem's can use depending on how dhcp gives them out.
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I've never worked with it, but a secondary address implementation seems like a nightmare to troubleshoot
Life is a matter of choice not chance. The path to your destiny will be paved by the decisions that you make every day.