October 2012
Intermediate to advanced
902 pages
28h 9m
English
Content preview from Juniper MX SeriesBecome 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.
J-Flow
Perhaps one of the most popular network services is J-Flow. J-Flow allows you to sample a subset of traffic and collect flow statistics. Flows are identified by unidirectional conversations. A flow is uniquely identified by the following fields:
Source IP address
Destination IP address
Source port number
Destination port number
Protocol
Type of service
Ingress interface
Collecting flow information is critical for businesses to provide accounting and billing, network capacity planning, and traffic profiling and analysis, and some countries require by law that all connections be collected. Flow information is created and transmitted to an external collector for further processing.
J-Flow Evolution
J-Flow is used to describe many different variants of collecting flow statistics. Each successive version of J-Flow provides more features and functionality than the previous version.
- J-Flow v5
This version of J-Flow supports only IPv4 and fixed fields that are not user-configurable.
- J-Flow v8
Flow aggregation was added with J-Flow v8. This enables the router to use less bandwidth, sending flow statistics to collectors. Another benefit is that the aggregation reduces the memory requirements of the collectors.
- J-Flow v9
The introduction of RFC 3954 introduced new concepts into flow statistics. The most notable was the introduction of predefined templates such as IPv4, IPv6, MPLS, and IPv4 in MPLS. Templates allow the router and collector to describe the flow fields in a common language. This allows ...
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.