what is the use of no auto-summary command.?

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Jun 25th, 2009

what is the use of no auto-summary command.? why do we use in RIP version 2..

I have this problem too.
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yagnesh_tel Thu, 06/25/2009 - 05:59

By default routing protocol like RIP and EIGRP summarize subnets into major classful network at classful boundary. In other word, these protocols perform an auto-summarization each time they crosses a border between two different major networks. To disable this behavior and advertise subnets, 'no auto-summary' command is used. Let's say router has two subnets and of Class B network and one subnet of Class A. When auto-summary is enabled, router will advertise only summarized major classful network for class B addresses into its Class A interface but you can change this default behavior and advertise both subnets using this 'no auto-summary'.


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