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network-programmingroutescisco

IP Address in between 2 routers?

I'm new to networking and pretty bad at subnetting. Could someone explain to me what's happening between Pescara and Pauillac? What is the 10.1.1.12/30 IP? I know the 30 is because of the 255.255.255.252 Mask. But the document I am using doesn't refer to this 10.1.1.12/30 anywhere.

  • Pescara is a PE Router

  • Pauillac is a P Router

The document I am talking about is here. It is about MPLS VPN Configuration.

Edit: Some more info: Pescara is using Subinterfaces to communicate to Pauillac. Am I to use 2 serial links?

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Solution

  • The 10.1.1.12/30 is just the subnet being used for the two interconnected interfaces. If you look at each connection they have a .13 and .14, this is because their IPs are 10.1.1.13 and 10.1.1.14 respectively of the subnet 10.1.1.12/30