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JUNOS Release 10.2 Software Installation and Upgrade Guide
Hardware Overview (J Series Routers)
The JUNOS Software is installed on the internal CompactFlash card. This internal
CompactFlash card is the primary and only boot drive on the J Series routers when
they are delivered from the factory. All J Series routers have one or more USB ports.
The 4300 and 6300 J Series routers also include an external CompactFlash card slot.
You can install external storage devices through the USB ports and CompactFlash
card slots. When external storage devices are installed, these external devices can
be used as backup boot drives. You can also create a backup internal boot drive on
any externally attached CompactFlash card. This CompactFlash card can then be
used to replace the internal CompactFlash card on the J Series router in the event
that the internal card is damaged or otherwise made unusable by the router. Figure
3 on page 20 shows the location of the memory and ports on a J Series router.
Figure 3: J Series Routers (J4300 Shown)
The J Series routers include the following:
System Memory
Starting with JUNOS Release 9.1, all J Series routers require a minimum of 512 MB
of router memory on each Routing Engine. Any router without this minimum requires
a system memory upgrade before you install JUNOS Release 9.1. To determine the
amount of memory currently installed on your router, use the CLI
routing-engine
For more information about memory requirements for the J Series routers, see the
Customer Support Center JTAC Technical Bulletin PSN-2008-04-021:
http://www.juniper.net/alerts/viewalert.jsp?txtAlertNumber=PSN-2008-04-021&actionBtn=Search
20
Hardware Overview (J Series Routers)
System Memory on page 20
Storage Media on page 21
command.
show chassis
.
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