Layer 3 point to point links

Answered Question
Sep 2nd, 2008
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I have a design question. I am in the middle of restructuring our network using a routed access layer design. I am using a 10.0.0.0 /16 for each building i have, then a /24 for individual vlans within that building and advertising a /8 to my core. This is kind of a basic question i should probably know, but what is the best structure and practice for point to point routed links? Should they be in the same subnet as my /16 that i advertise to the distribution block or should i just use an entirely different IP with a /30?


For example, I have a building called "Building 5". It's summarized subnet would be 10.5.0.0 /16. I have a few vlans such as vlan 100 (10.5.100.0) and vlan 200 (10.5.200.0) Could my P2P links be 10.5.1.1 and on the distribution be 10.0.5.1.2 /30? or should i use something completely differentlike 192.168.1.0 /30?

Correct Answer by Collin Clark about 8 years 11 months ago

Mine is still in the 10 network (along with server and client subnets), but it's way outside the normal ranges. I like to start at the high end and work my way down. For example my first subnets would be-


10.255.255.0 /30

10.255.255.4 /30

10.255.255.8 /30

...

...


Different classes would be effective too.

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Collin Clark Tue, 09/02/2008 - 07:18
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I use a separate address space with /30 masks. When you traceroute, it's easy to spot "transit" links.


Hope that helps.

cowetacoit Tue, 09/02/2008 - 07:19
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I just edited my message....


So you think a probably a 192 or 172 private address would be easier to spot? I see your point.

Correct Answer
Collin Clark Tue, 09/02/2008 - 07:33
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  • Purple, 4500 points or more

Mine is still in the 10 network (along with server and client subnets), but it's way outside the normal ranges. I like to start at the high end and work my way down. For example my first subnets would be-


10.255.255.0 /30

10.255.255.4 /30

10.255.255.8 /30

...

...


Different classes would be effective too.

cowetacoit Tue, 09/02/2008 - 07:36
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I like your design better than using a different class. Thanks for clearing that up.

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