Addressing Schemes

Bolton07

It is easier to perform summarization if the addressing scheme is hierarchical.

What does hierarchical mean in the context above?

tomaifauchai

Here's how i see it,

Hierarchical:

• 10.1.0.0/24
• 10.1.1.0/24
• 10.1.2.0/24
• 10.1.3.0/24

Summary : 10.1.0.0/22
You don't waste any subnets (Good way to assign subnets)

Non-Hierarchical:

• 10.1.0.0/24
• 10.1.3.0/24
• 10.1.6.0/24
• 10.1.7.0/24

Summary: 10.1.0.0/21
You waste 4 subnets, so personally i won't summarize that block and just use 4 routes. (Wrong way of assigning subnets)

If you own a block of addresses, it doesn't matter that you summarize the whole block and send only 1 route to your neighbor but you might generate useless traffic in your network, in the case one of these subnet is down.