July 2009
Intermediate to advanced
752 pages
23h 19m
English
Content preview from JUNOS Enterprise SwitchingBecome 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,
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EX Series Architecture
This section provides a high-level overview of typical EX Series platforms to prepare the reader for upcoming detailed discussions of packet flow in this chapter, as well as in Chapters 4 and 11.
The EX-PFE ASIC
The heart of the EX platform is the EX-PFE ASIC. This Juniper-developed chip offers extreme network and VCP/fabric flexibility, which allows it to be used in a number of different modes within a particular switch model. As with other Juniper designs, this PFE mechanism can be replicated as needed to provide increased switch capacity through a multichip PFE complex. For example, an EX3200-24 is based on a single PFE ASIC, whereas the EX4200-48 uses three. Meanwhile, a single 8200 series LC uses four PFE chips to support 8×10 GE front panel ports, along with the necessary switch fabric connections. Each EX-PFE chip can forward more than 102 Mpps at wire rate, whether all Layer 2, all Layer 3, or any mix.
EX-PFE effectively offers some 88 Gbps of switching/communications capacity, which can be carved up and delegated to 1×GE, 10×GE, or VCP/fabric ports as each hardware application requires. For example, each EX-PFE can provide 24×1 Gigabit ports + 2 VCP ports, or alternatively can provide 24×1 Gigabit + 1×10 Gigabit + 1 VCP port, or in yet another application, 2×10 Gigabit + 2 VCP ports.
We highlight the flexibility of the EX-PFE ASIC in the next section, where you can see it operating in a number of the aforementioned modes.
EX3200 Architecture
Our hardware ...
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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.
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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.