If the router contains only one SRP module, you should divert traffic to another router before you install a new software release, because the router will be unavailable during the installation process. Depending on whether a firewall separates the E-series router from the network host, you can then complete the appropriate software installation (see Installing Software When a Firewall Exists or Installing Software When a Firewall Does Not Exist). However, if the router contains two SRP modules, you can upgrade the software while the system is operating (see Upgrading Systems That Are Operating with Two SRP Modules).
When installing new JUNOSe software, you must mount the software CD on a network host and transfer the release files to at least one E-series router in the network. Depending on the network configuration, you can copy the release files from either the network host or the first E-series router to the other E-series routers in the network (see Copying Release Files from One E-Series Router to Another).
Identifying the Software Release File
The JUNOSe software CD contains two software releases: one for the ERX-1440 model and one for all other E-series routers. Both releases are in the software directory, which is identified by the release number. For example, if the release number is x.y.z, the name of the directory is x-y-z. To identify the software release file:
- Access the software directory.
- Find the files with the extension .rel.
- The software release file for the ERX-1440 router has the format erx40_x-y-z.rel, where x-y-z is the release number.
- The software release file for all other E-series routers has the format erx_x-y-z.rel, where x-y-z is the release number.
The procedures outlined in the following sections provide detailed instructions for typical installations. For additional information about commands and troubleshooting, see the E-Series System Basics Configuration Guide, the E-Series Command Reference Guide A to M, and the E-Series Command Reference Guide N to Z.