June 2008
Intermediate to advanced
526 pages
15h 34m
English
Content preview from MPLS-Enabled Applications: Emerging Developments and New Technologies
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
3.6. LINK PROTECTION
As discussed in the previous section, link protection refers to the ability to protect traffic being forwarded on an LSP when a link along the LSP fails. To protect against the failure of a link, a backup tunnel is set up around the link. This backup is called a detour in the case of one-to-one protection and bypass in the case of many-to-one protection.
Figure 3.10 shows one LSP, LSPxy from X to Y, along the path X-A-B-Z-Y. Link A-B is protected by a backup LSP taking the path A-C-D-B. When link A-B fails, traffic from LSPxy (the protected path) is forwarded on this backup around the broken link at A and delivered to B, from where it continues on its normal path to destination Y. Node A, where traffic is spliced from the protected path on to the backup, is the PLR, and node B, where traffic merges from the backup into the protected path again, is the MP.[] Throughout this chapter, we will use the terms 'protected path' and 'main path' interchangeably to mean the LSP receiving protection.
[] As noted earlier in this chapter, in the case of one-to-one protection, the MP does not necessarily need to be the router immediately downstream of the protected link. However, for the discussion in this section, we have chosen a topology such that the MP is the same for both the one-to-one protection and facility protection cases, so that the label operations can be compared more easily for the two cases.
Figure 3.10. Topology for detailed link protection discussion
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.