I read about VLSM and understood its importance is conserving IP space in an enterprise.
What i am wondering is if an enterprise is assigned a class A private IP range(practically more than enough IP addresses that the enterprise can imagine to use), will it still be useful to use VLSM?
What i understand is using VLSM here will only increase the routing table size and cause added complexity in interpreting IP addresses.
Please give guidance on this.
To add another point to the above post:
VLSM permits you to further enhance the hierarchical structure to the "IP address assignment by location" scheme.
or example, you could assign a /25 or /26 to a given building in a campus, summarize all the buildings into a /23or /24, further summarize all campuses in that region into a /20, further summarize all regions in that country into a /16, then go to the corporate Global level with everything summarized into a /8 for IS/IT resources, external vendor nets, etc.
By summarizing in that fashion, the routing tables can be kept small(er) and you gain some efficiency out of the hierarchy for both routing tables and filters/firewalls.
Using VLSM and CIDR blocks you can "rightsize" each of those hierarchical levels ... something you really couldn't do well with traditional classfull boundaries.