Let's Lab. IS-IS routing protocol. Part 2

Hi, Habr!

Concepts and rules! They surround us everywhere. What to eat, how to cross the road, why you should not lick the frogs and how to transfer packets if you are a router. A lot of all sorts of pieces have to keep in mind the network engineer. Sometimes you won’t understand whether you need to know all LSA types in OSPF, what port TCP sessions are built in BGP, and it’s important to learn something new every day, while not forgetting the old one.

One way or another, it is too early to move on to practice, until there is an understanding of the theory. In the release there will be a lot of concepts that I will try to explain to you. I poured all the water and history into the first issue. And this release will consist of two sections, in the first of which I will talk in detail about topologies with IS-IS. The second section will be devoted to data exchanged between routers in IS-IS.
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And that's what will be discussed:
Is it difficult to be a router with OSPF or IS-IS on board?
How do OSPF and IS-IS build the topology?
L1, L2, L1 / L2 routers and where to attach them.
What is Partial route calculation and how does ISPF work?
Why do we need a lot of Area, and are they important?
Do I need an IS-IS virtual link?
Change the number of Area without downtime?
Why is IS-IS called the L2 protocol?
Grandma, why do you need more MTU?
What is a PDU, and how are they in IS-IS?
Why do I love Overload bit so much?
And how to stuff ip-prefixes and cheeseburger into OSI-protocol?



In the next issue, more fun. Give the command line!

There is no text article under the cut. Only references and references.

Part 1 here.

Books to read (including about OSPF):

H.Gredler-The Complete IS-IS Routing Protocol-2005
Abe Martey - Cisco Press - IS-IS Network Design Solutions
Cisco Press - Routing.TCP.IP.Volume.1.2nd.Edition.Oct.2005
Wendell Odom, Rus Healy, Denise Donohue - CCIE Routing and Switching Exam Certification Guide 4th Edition - 2009
CCIE Routing and Switching v5.0 Official Cert Guide Volume 1

References:
big presentation with CiscoLive about ISIS
tuning OSPF, in tp ISPF and PRC
wonderful article about ISIS in Junos and PDU with inetzero.com
traffic dumps
OSI protocols, in Russian!
a little more about PDU, capaciously and with kratinkami
deeper in PDU with wireshark
examples of database formation
big ISIS blog with practice

With your criticism, you can influence the next issue. For the better.
PS Releases are similar to CBT Nuggets. I really like their presentation format. My respects to Jeremy Cioara .