Supported Platforms
Hardware Overview (ACX Series, M Series, MX Series, T Series, and TX Matrix Routers)
Figure 1 shows examples of Routing Engines.
Figure 1: Routing Engines
The ACX Series, M Series, MX Series, PTX Series, T Series, TX Matrix, and TX Matrix Plus routers include the following:
System Memory
Starting with Junos OS Release 9.0, all routing platforms require a minimum of 512 MB of system memory on each Routing Engine. All M7i and M10i routers delivered before December 7, 2007, had 256 MB of memory. These routers require a system memory upgrade before you install Junos OS Release 9.0 or a later release. To determine the amount of memory currently installed on your system, use the show chassis routing-engine command in the command-line interface (CLI).
For more information about upgrading your M7i or M10i router, see the Customer Support Center JTAC Technical Bulletin PSN-2007-10-001: https://www.juniper.net/alerts/viewalert.jsp?txtAlertNumber=PSN-2007-10-001&actionBtn=Search.
ACX2000 routers are shipped with 2 GB of memory and ACX1000 routers with 1 GB of memory.
Storage Media
Except for the ACX Series and MX80 routers, the M Series, MX Series, PTX Series, T Series, TX Matrix, and TX Matrix Plus routers use the following media storage devices:
- CompactFlash card—The CompactFlash card is typically
the primary storage device for most routers.
Note: M7i and M10i routers using RE-400 are not delivered from the factory with the CompactFlash card installed. In this case, the hard disk is the primary and only boot device. The M7i and M10i routers with RE-400 can be upgraded to include the CompactFlash card.
- Hard disk or solid -state drive—For most routers,, a hard disk or solid-state drive is the secondary boot device. When the CompactFlash card is not installed on the router, the hard disk or the solid-state drive becomes the primary boot device. The hard disk or solid-state drive is also used to store system log files and diagnostic dump files.
- Emergency boot device—Depending on the router, the emergency boot device can be a PC card, a USB storage device, or an LS-120 floppy disk.
On MX80 routers, the internal NAND flash devices (first da0, then da1) act as the primary and secondary boot devices.
On ACX Series routers, the internal NAND flash devices (first da0s1, then da0s2) act as the primary and secondary boot devices.
Emergency boot devices can be used to revive a routing platform that has a damaged Junos OS. When an emergency boot device is attached to the router, the router attempts to boot from that device before it boots from the CompactFlash card, solid-state drive (SSD), or hard disk.
On an ACX Series router, the emergency boot device is a USB storage device.
When booting from an emergency boot device, the router requests a boot acknowledgment on the console interface. If you enter yes, the emergency boot device repartitions the primary boot device and reloads Junos OS onto the primary boot device. After the loading is complete, the routing platform requests that you remove the emergency boot device and reboot the system. After the reboot is complete, you must perform an initial configuration of the router before it can be used on your network.
