# Upgrading NVS Cards on SRP Modules

This section describes how to install higher-capacity NVS cards on SRP modules. The procedure you use depends on the number of SRP modules in the system. A new NVS card already contains the software release you ordered.

| Note: The new NVS card must contain the same software release that you are running on the system.

## Upgrading a System That Contains One SRP Module

If the system contains only one SRP module, you must power down the system before you upgrade the NVS card.

| Caution: If you do not use the halt command before removing or powering down an SRP module, the system's NVS card can become corrupted.

To upgrade the NVS card on a system that contains one SRP module:

1. Enter the halt command.

   See JunosE System Basics Configuration Guide, Chapter 6, Managing Modules for information about the halt command.

   | Warning: 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.

   | Caution: When handling modules, use an antistatic wrist strap connected to the router's ESD grounding jack. This action helps to protect the module from damage by electrostatic discharge.

2. Connect the antistatic wrist strap to the ESD grounding jack on the router.
3. Power down the system.
4. Remove the SRP module.
5. Replace the NVS card on the SRP module. (See Replacing an NVS Card.)
6. Power up the system. (See Powering Up ERX Routers.)

## Upgrading a System That Contains Two SRP Modules

In a system that contains two SRP modules, you can upgrade the NVS cards on the SRP modules without powering down the system.

| Warning: 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.

| Caution: When handling modules, use an antistatic wrist strap connected to the router's ESD grounding jack. This action helps to protect the module from damage by electrostatic discharge.

To upgrade the NVS cards on the SRP modules in a system that contains two SRP modules:

1. Connect the antistatic wrist strap to the ESD grounding jack on your router.
2. Halt the redundant SRP module.
   host1#halt standby-srp
3. Remove the redundant SRP module from the chassis.
4. Replace the NVS card on this SRP module. (See Replacing an NVS Card.)
5. Reinsert the SRP module into the chassis.
6. When this SRP module is available, synchronize the SRP modules.
   host1#synchronize
7. When the SRP modules are synchronized, reboot the SRP module that you upgraded.
   host1#reload slot 7
8. When this SRP module is available, synchronize the SRP modules.
   host1#synchronize
9. When the SRP modules are synchronized, force the redundant SRP module to take over from the primary SRP module.
   host1#srp switch
10. Halt the redundant (former primary) SRP module.
    host1#halt standby-srp
11. Immediately remove the former primary SRP module.
12. Repeat Steps 4–8 for the former primary SRP module.