United States
Q
What is 800 Router Memory & Flash?
A
800 Router Memory & Flash is the built-in DRAM and flash storage subsystem on Cisco 800 Series routers that holds the operating system, configurations, and operational data.
Q
Why should I upgrade the memory & flash on my 800 Series router?
A
Upgrading memory & flash enhances performance, supports larger IOS images, and enables advanced services such as VPN, firewall, and QoS.
Q
How much DRAM does the 800 Series router support?
A
The Cisco 800 Series router supports up to 256 MB of DRAM, providing sufficient capacity for multitasking and feature expansion.
Q
What flash capacity is available for the 800 Series router?
A
800 Series routers include 32 MB to 64 MB of onboard flash and support external CompactFlash expansion up to 512 MB.
Q
How do I upgrade DRAM on an 800 Series router?
A
Power off the router, open the chassis, replace the existing DRAM SIMM with a compatible module, then reassemble and power on.
Q
How do I expand flash memory on my 800 Series router?
A
Insert a supported CompactFlash card into the external slot, then set the boot variable to the new flash location with the `boot system` command.
Q
Which memory modules are compatible with the 800 Series router?
A
Install 72-pin, 16-bit SIMM modules rated at 60 ns or faster, as specified by Cisco for the 800 Series.
Q
Can I operate the router while upgrading memory or flash?
A
No. You must power down the router before installing or removing DRAM or CompactFlash to prevent hardware damage.
Q
How do I check current memory and flash usage?
A
Use `show version` to display DRAM details and `show flash:` to view flash capacity and utilization in privileged EXEC mode.
Q
How can I back up my flash memory before an upgrade?
A
Run `copy flash: tftp:` or `copy flash: usbflash0:` to transfer all flash files to a TFTP server or USB storage device.
Q
What is the best practice to clear flash memory safely?
A
Use the `erase flash:` command in privileged EXEC mode, then reload the router to remove any residual data.
Q
How do I recover from a failed flash update on an 800 Series router?
A
Enter ROMMON mode by pressing Break during boot, run `flash_init` and `load_helper`, then use TFTP to reinstall the IOS image.
Q
What performance benefits can I expect with increased memory & flash?
A
More memory & flash reduces IOS reloads, supports advanced features, and improves routing convergence and VPN throughput.
Q
How much flash memory is recommended for running multiple IOS images?
A
Allocate at least 128 MB of flash to store multiple IOS versions and backups for redundancy and quick rollbacks.
Q
Is the CompactFlash card hot-swappable on the 800 Series router?
A
No. The CompactFlash card is not hot-swappable; always power down the router before inserting or removing the card.
Q
How do I troubleshoot memory errors on my 800 Series router?
A
Use `show logging` to identify memory faults, reseat the DRAM module, verify compatibility, and replace any failing modules.
