Wednesday, September 15, 2010

VLSM and Route Summarization

VLSM
VLSM occurs when an internetwork uses more than one mask in different subnets of a single Class A, B, or C network.  VLSM allows engineers to reduce the number of wasted IP addresses in each subnet, allowing more subnets and avoiding having to obtain another registered IP network number from regional IP address assignment authorities.

Command : ip summary address ( summary address )
                 : no autosummary

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