Tag: foundry

Fun with QinQ

Not all service providers have blanket coverage of an entire country. When a service provider gives service to a customer, more than likely the customer will be using a line from an external carrier of the ISP’s choosing. Metro Ethernet is becoming more and more common these days and it does give us as designers…

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Using /31’s on point to point links and their effect on routing protocols

The use of 31bit subnet masks on point to point links is documented in RFC 3021: http://www.ietf.org/rfc/rfc3021.txt If you know subnetting, you should know that networks always need a subnet address (all zeroes) and a ‘broadcast’ address. This is why when you generally use a /30 for point-to-point links. 2 addresses used for the routers…

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