1

Is it a right way to supernet/range in OSPF for the following network address?

area 0.0.0.x 10.128.0.0 255.255.255.0

How 10.128.0.0 can have a subnet of 255.255.255.0, e.g. /24?

Is this a right thing to do?

I thought the right subnet should be 255.255.0.0, e.g. /16?

Am I correct on this?

Ron Maupin
  • 102,040
  • 26
  • 123
  • 202
dexterous
  • 325
  • 2
  • 4
  • 12

1 Answers1

2

Depending on what your underlying network sizes are, you can aggregate them to a prefix smaller than what you started with. For example, if you have these networks:

  • 10.128.0.0/30
  • 10.128.0.4/30
  • 10.128.0.8/29
  • 10.128.0.16/29
  • 10.128.0.24/29

You can aggregate them into 10.128.0.0/27.

Don't get hung up on the octets, which are simply to make it easier for humans to read. You need to do IP manipulation in binary.

Ron Maupin
  • 102,040
  • 26
  • 123
  • 202