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Bes4dminFlag for Sweden

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Subnet a subnet

We have a MPLS network our ISP provides us with. It is a /20 network.
Now we want to have several vlans but we don't want to tell our ISP every time we need a vlan so we want to create all our vlans on our Layer 3 switch.

Our ISP tells me they will on their router point the entire /20 network to our Layer 3 switch. And so we can subnet the /20 network the into the subnets we like.

So I guess as long as I subnet using  /21 /22 /23 /24 this is possible?
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Ken Boone
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Yes that is correct.  If you have one connection on the MPLS network that the provider is routing a /20 to .. you can chop that up however you see fit at that location.  

Now if you have 8 MPLS locations and the /20 is already chopped up between all locations that is a different story.  But it sounds like they are routing a /20 down a single network connection to a single location.
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we have six MPLS locations and each one of them have a /20 address. E.g one site has  172.16.80.0/20 and the other has 172.16.96.0/20
So every site can take after us then and start subneting. :-)
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Akinsd
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Thank you! This is topclass educating answer and I will have it in my Q&A
Thanks for the kind words

All the best