Google Engineer. Dual CCIE #38070. JNCIE-SP #2227
I’ve gone over the OSPFv2 and OSPFv3 databases in depth before. Now is the time for IS-IS. As always, I’ll start from a basic two router set up and add devices to the topology. Basic LSPs In OSPF we use the term LSA, Link-State Advertisement. In IS-IS we use the term LSP – Link-State PDUs.…
OSPFv3 Authentication Trailer In 2011 I wrote an article showing that in order to provide authenticated OSPFv3 neighbour sessions, you needed the security license on IOS. Manav Bhatia commented on that post stating they were working on an IETF standard to fix this. That draft became RFC6506 and then RFC7166 Cisco has added support for…
OSPFv3 has been extended so that IPv4 can now be routed using it. If running both IPv6 and IPV4 over OSPFv3, they are run as separate processes completely. If we go back to the topology we started with: R1 and R2 have IPv6 OSPFv3 set to point-to-point. If I enable IPv4 OSPFv3, there is an…
Previous posts in this series has been limited to a single area. Let’s now start adding new areas and see what LSAs are produced. I’m going to add R6 to area 6 as follows: Area 1 is a standard area. R6 is originating it’s loopback into OSPFv3. R1 is a regular ABR. In OSPFv2 I…
In yesterday’s post I forgot to mention a very interesting behaviour of the way router’s originate Type9 LSAs over a broadcast segment. Let’s remind ourselves of the topology we were up to: I’ve reset this topology and currently R3 is the DR. Let’s first check the non-broadcast link between R1 and R2. Each router oritiginates…
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