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TOPIC: OSI-IP IS-IS Multiarea Routing

OSI-IP IS-IS Multiarea Routing 12 years 2 months ago #13670

  • Ranger24
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Hi Guys, Girls 'n' Others,

I have a customer who 'needs' to use OSI-IP IS-IS Multiarea routing to carry managenment traffic from remote nodes to the central network management station.

I say 'needs' because I am not convinced the need to but want to.

Can you help me to understand what OSI-IP IS-IS multiarea routing is? I don't really understand what it is or what advantages it has? or when is should be used?

Real world examples would be good.



Patience - the last reserve of the any engineer
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Re: OSI-IP IS-IS Multiarea Routing 12 years 2 months ago #13680

  • havohej
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there are a lot of isis info you can find in the internet, but trying to be objective i describe you the most important.

If you have experience with ospf area segmentation, isis works almost the same way, instead you define level1 area for the routers to establish adjacencies, and level 2 only, or level1, and 2 for inter area comunication, so the border area router must belong to area 1 for comuniction with routers within his own area, and with level, 2 for comunication with another area border router who belongs to another area.
thus, preventing the flooding of large routing tables that belong to any area, to propagate and coverge only with his area, and not propagating to the entire network (as OSPF also).

hey men, I suggest you to use ospf or either closed BGP if you have veery big routing tables, and also for protect the performance of the area
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