July 2002
Intermediate to advanced
608 pages
14h 52m
English
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Interarea Tunnels
Up until now, you've seen TE tunnels that must start and end in the same area (or level, rather than area, if you're an IS-IS fan.) In fact, in older versions of Cisco IOS Software, a router was limited to a single TE database. This meant that not only could you not have a TE tunnel that spanned multiple areas, you couldn't have a router that was connected to multiple areas and had TE tunnels in each area independently. However, this restriction can be overcome using interarea tunnels.
IGP Terminology
Before diving into how interarea TE tunnels work, it's important to get the terminology straight. In OSPF, an area is a set of routers that share a common SPF tree. IS-IS, however, uses the term level to mean the same thing. Because ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.