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I have an address zone (let's say 150.41.0.0/16) and I want to subnet it optimally using VLSM. I have a number of VLANs, each with a minimum number of needed addresses, and a couple of router-to-router connections.

How many addresses are needed for a router-to-router connection (that is considered as a subnetwork)?

Is it four? One for each router, the broadcast address and the network address?

random
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biggdman
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1 Answers1

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That depends on whether your routers support RFC 3021 addressing or not. Typically you'd use a /30 subnet for a point-to-point, but RFC 3021 allows for /31's.

Edit:

If you use /30's then you have 2 bits of host ID. If you use /31's then you have 1 bit of host ID. Do the math... >smile<

Smells like homework, BTW.

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Evan Anderson
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