Troubleshooting: Software Upgrade Failure Due to Insufficient Available DRAM on a Routing Matrix with a TX Matrix Plus Router

Problem

In a routing matrix with a TX Matrix Plus router, a successful upgrade of the Junos OS requires sufficient available DRAM on all Routing Engines of the TX Matrix Plus router and connected T1600 routers.

Cause

Failure of a Junos OS upgrade due to insufficient available DRAM on a Routing Engine occurs infrequently. When it does occur, there are various causes and therefore various solutions to the issue.

If you suspect that insufficient available DRAM is preventing a successful upgrade of the Junos OS, contact your technical support representative.

Solution

If you suspect that insufficient available DRAM is preventing a successful upgrade of the Junos OS, contact your technical support representative.

Note: It can be useful to issue the request support information command before contacting technical support. The command runs several Junos operational commands to obtain detailed information about the system hardware and software. Because the amount of command output is quite large, we recommend that you save the output to a file.

In some cases of insufficient available DRAM, a different or upgraded Routing Engine with a larger amount of DRAM is required. However, most DRAM issues that prevent a successful upgrade can be resolved by removing any superfluous files from the /root and /tmp directories.