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The original example network number was not valid.

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edit approved Apr 23, 2015 at 22:12

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I understand that for classful networks in EIGRP we do not need a subnet mask. Why is this? When I do a show ip protocols the routes appear without a subnet mask which looks somewhat odd.

If I have a 192.168.10.0/16 network and just introduce the network into the EIGRP routing protocol as 192.168.10.0, how will EIGRP know that it is 192.168.10.0/16 and not say 192.168.10.0/24?

Or does EIGRP understand the network address from the host addresses assigned to the router's DC interfaces?

Thanks.

I understand that for classful networks in EIGRP we do not need a subnet mask. Why is this? When I do a show ip protocols the routes appear without a subnet mask which looks somewhat odd.

If I have a 192.168.1.0/16 network and just introduce the network into the EIGRP routing protocol as 192.168.1.0, how will EIGRP know that it is 192.168.1.0/16 and not say 192.168.1.0/24?

Or does EIGRP understand the network address from the host addresses assigned to the router's DC interfaces?

Thanks.

I understand that for classful networks in EIGRP we do not need a subnet mask. Why is this? When I do a show ip protocols the routes appear without a subnet mask which looks somewhat odd.

If I have a 192.168.0.0/16 network and just introduce the network into the EIGRP routing protocol as 192.168.0.0, how will EIGRP know that it is 192.168.0.0/16 and not say 192.168.0.0/24?

Or does EIGRP understand the network address from the host addresses assigned to the router's DC interfaces?

Thanks.

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asked Apr 22, 2015 at 11:32

user

Why is no subnet mask required in EIGRP for classful networks?

I understand that for classful networks in EIGRP we do not need a subnet mask. Why is this? When I do a show ip protocols the routes appear without a subnet mask which looks somewhat odd.

If I have a 192.168.1.0/16 network and just introduce the network into the EIGRP routing protocol as 192.168.1.0, how will EIGRP know that it is 192.168.1.0/16 and not say 192.168.1.0/24?

Or does EIGRP understand the network address from the host addresses assigned to the router's DC interfaces?

Thanks.

eigrp