Route filter effects. Link-State vs Distance-Vector

You may think that setting up a route filter would be pretty much the same, no matter what the actual routing protocol is, but you’d be wrong. The main difference is essentially the main difference with these 2 types of protocols to begin with. A distance-vector protocol exchanges routes with it’s neighbours. A link-state protocol…

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Do we now need a security IOS license simply to provide OSPF authentication for IPv6?

While going through the CCIE 4th edition cert guide, I’ve come across something that is potentially a very big problem. Currently if you want to authenticate OSPF and EIGRP neighbours you can do so via plain-text or MD5 passwords. With IPv6 you need to use OSPFv3 and EIGRP. Here’s where it get’s bad. OSPFv3 does…

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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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