Info required about Secondary IP

Hi Seniors,
I need some info about secondary ip....like....in which circumstances is it being used.
I am not looking for the config method...but some theory behind the evolution of sec.ip

Hi Rajesh,
Secondary IP addresses can be used in a variety of situations. The following are the most common applications:
•There may not be enough host addresses for a particular network segment. For example, your subnetting allows up to 254 hosts per logical subnet, but on one physical subnet you need 300 host addresses. Using secondary IP addresses on the routers or access servers allows you to have two logical subnets using one physical subnet.
•Many older networks were built using Level 2 bridges. The judicious use of secondary addresses can aid in the transition to a subnetted, router-based network. Routers on an older, bridged segment can be easily made aware that many subnets are on that segment.
•Two subnets of a single network might otherwise be separated by another network. This situation is not permitted when subnets are in use. In these instances, the first network is extended, or layered on top of the second network using secondary addresses
Check this link for more details
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipras_r/1rfipadr.htm#wp1017863
HTH, if yes please rate the post.
Ankur

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    Secondary IP addresses can be used in a variety of situations. The following are the most common applications:
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