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Upgrading Memory on SRP Modules

This section describes how to upgrade memory on SRP modules. JUNOSe software releases 3.0.x and higher require at least 512 MB of memory on each SRP module, while releases 5.3.x and higher require at least 1 GB of memory. See the ERX Module Guide for more information.

The ERX-310 SRP module contains two small outline dual inline memory module (SODIMM) banks that use 256-MB memory, and currently is not upgradeable.

Four main steps are involved in upgrading memory on SRP modules:

  1. Display how much memory is currently installed on the SRP module.
  2. Remove the SRP module and the SODIMMs.
  3. Add the new SODIMMs to the SRP module.
  4. Reinstall the SRP module and verify the upgrade.

See the following sections for information on each step.

Do not insert any metal object, such as a screwdriver, or place your hand into an open slot or the backplane when the router is on. Remove jewelry (including rings, necklaces, and watches) before working on equipment that is connected to power lines. These actions prevent electric shock and serious burns.

When handling modules, use an antistatic wrist strap connected to the router's ESD grounding jack, and hold modules by their edges. Do not touch the components, pins, leads, or solder connections. These actions help to protect modules from damage by electrostatic discharge.

Displaying the Memory Installed

Before you install the new memory, issue the show hardware command to see how much memory is installed. Each ERX-7xx and ERX-14xx model SRP module usually has at least 256 MB of memory. You need one upgrade kit for each SRP module in the system.

Depending on the upgrade you are performing, the kit contains a specific number of SODIMMs.

Removing SODIMMs

After removing the SRP module from the router, you might have to remove lower-memory SODIMMs to upgrade to a higher-capacity SRP module. The SODIMM sockets are close to the NVS card and have a cream-colored ceramic connector at one edge. Some or all of the sockets might already contain SODIMMs.

  1. Push down on the back edge of a SODIMM to release it from the socket. (See Figure 38.)
  2. Gently pull the SODIMM up and out to disconnect it from the connectors and remove it from the socket.

Adding New SODIMMs

To add new SODIMMs:

  1. Locate the four SODIMM sockets on the SRP module. (See Figure 38 and Figure 39.) See the previous section to learn how to remove SODIMMs.

    Figure 38: SODIMM Sockets on the SRP-5 and SRP-10 Module

    Image g013451.gif

    Figure 39: SODIMM Sockets on the SRP-40 Module

    Image g013452.gif

  2. Insert a SODIMM from the upgrade kit at an angle of approximately 45 degrees into an empty ceramic connector, so that the notch in the long gold edge of the SODIMM aligns with the notch in the connector.

    The notch on the long gold edge is no longer visible when the SODIMM is pressed in far enough.

  3. Press the top surface downward into the socket until the socket spring snaps into place and holds it.
  4. Repeat Steps 2–3 with the other SODIMM.
  5. Repeat Steps 1–4 for the other SRP module, if present.

Verifying the Upgrade

To verify that the upgrade is complete:

  1. Place the SRP modules in the chassis.

    The SRP modules reboot.

  2. Close the ejector handles and tighten the thumbscrews.
  3. Issue the show hardware command, and verify that the display indicates that the correct amount of memory is present.

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