October 2012
Intermediate to advanced
902 pages
28h 9m
English
Content preview from Juniper MX Series
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Switch and Control Board
At the heart of the MX Series is the Switch and Control Board (SCB). It’s the glue that brings everything together. The SCB has three primary functions: switch data between the line cards, control the chassis, and house the routing engine. The SCB is a single-slot card and has a carrier for the routing engine on the front. A SCB contains the following components:
An Ethernet switch for chassis management
Two switch fabrics
Control board (CB) and routing engine state machine for mastership arbitration
Routing engine carrier
Figure 1-32. Switch and control board components
Depending on the chassis and level of redundancy, the number of SCBs vary. The MX240 and MX480 require two SCBs for 1 + 1 redundancy, whereas the MX960 requires three SCBs for 2 + 1 redundancy.
Ethernet Switch
Each SCB contains a 24-port Gigabit Ethernet switch. This internal switch connects the two routing engines and all of the FPCs together. Each routing engine has two networking cards. The first NIC is connected to the local onboard Ethernet switch, whereas the second NIC is connected to the onboard Ethernet switch on the other SCB. This allows the two routing engines to have internal communication for features such as NSR, NSB, ISSU, and administrative functions such as copying files between the routing engines.
Each Ethernet switch has connectivity to each of the FPCs. This allows for the routing ...
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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.