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Suppose a router R1 is directly connected to the following subnets:

10.1.0.0/24

10.1.1.0/24

10.1.2.0/24

10.1.3.0/24

If it is running RIPv1, it will advertise:

"i have the network 10.0.0.0" (implicitly understood by receiving RIPv1 routers as 10.0.0.0/8 because the protocol is classful)

but suppose we changed the routing protocol to RIPv2 and turned ON auto-summarization. Would it behave in the same way? Would it advertise:

"i have the network 10.0.0.0" (advertised WITHOUT subnet mask, and implicitly understood by other routers as 10.0.0.0/8)

OR would it auto-summarize in a non classful way like:

"i have 10.1.0.0/22" (advertised as network id and subnet mask pair)

In other words, does turning on auto-summarization in RIPv2 (or other classless routing protocols) cause it to auto-summarize in a classful manner or simply auto-summarize classlessly to the best of its ability?

yorble
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1 Answers1

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That would depend on the router, but if you do not define a subnet (if the router allows this) than it would be logical to advertise the class. However if you define the subnetmask it will advertise the subnet.

Lucas Kauffman
  • 16,990