July 2002
Beginner
360 pages
11h 19m
English
Content preview from IPv6 EssentialsBecome 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.
Quality of Service in IPv6 Protocols
Given the different QoS paradigms, the designers of IPv6 had to be careful not to impose a specific mechanism, but to provide enough flexibility to support multiple QoS mechanisms. Thus, after much debate and many redesigns, the IPv6 protocols carry a small number of QoS-specific service elements in the IP Base and Extension headers, which can be used in different ways and in several combinations.
IPv6 Base Header
The following section describes the QoS-specific service elements in the IP Base header, namely flows and corresponding flow labels.
Flows
A flow is a sequence of packets sent from a particular source to a particular (unicast or multicast) destination(s), for which the source requires special handling by the intermediate routers. The nature of that special handling can be communicated to the routers by a corresponding control protocol, such as RSVP, or by information within the flow’s packets themselves—e.g., in an IP Base header or a Hop-By-Hop Extension header. There may be multiple active flows from a sender to a receiver, as well as traffic that is not associated with any flow at all. A flow in the IP protocol is uniquely identified by the combination of a source IP address and a non-zero identification, the flow label. Packets that do not belong to a flow carry a flow label of all zeros.
All packets belonging to the same flow must be sent with the same IP source address, IP destination address, and non-zero flow label. If any ...
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.