United States
Q
What is the default DRAM and Flash memory on a Cisco 1800 Series router?
A
Default memory varies by model. For example, the Cisco 1841 ships with 128 MB DRAM and 32 MB Flash, while entry models may start at 32 MB DRAM and 8 MB Flash.
Q
How much DRAM and Flash can a Cisco 1800 router support?
A
Cisco 1800 routers support up to 256 MB of DRAM and up to 256 MB of CompactFlash, depending on IOS and platform licensing.
Q
What types of Flash memory are compatible with Cisco 1800 routers?
A
Cisco 1800 routers accept onboard Flash modules and Type I or Type II CompactFlash cards with industrial temperature ratings and Cisco-approved part numbers.
Q
How do I check current memory and Flash availability on a Cisco 1800 router?
A
Use the CLI commands “show version” for installed DRAM/Flash and “show flash:” or “dir flash:” to list available Flash and free space.
Q
How can I upgrade DRAM on a Cisco 1800 router?
A
Power off the router, remove the chassis cover, install the approved DRAM module into the memory slot, replace covers, and power on. Verify with “show version.”
Q
How can I upgrade Flash memory on a Cisco 1800 router?
A
Shut down the router, remove the CompactFlash card, replace it with a larger Cisco-approved card, power on, then format and verify with “format flash:” and “show flash:.”
Q
Can I use third-party CompactFlash cards in my Cisco 1800 router?
A
Cisco recommends using only Cisco-approved CompactFlash cards to ensure compatibility, reliability, and firmware support on 1800 Series routers.
Q
What command formats a Flash or CompactFlash on a Cisco 1800 router?
A
Enter global configuration mode and run “format flash:” or “format flash0:” to reinitialize the Flash file system.
Q
How do I boot a Cisco 1800 router from the Flash memory?
A
Configure the boot variable with “config-terminal” and “boot system flash <image_name>,” then save with “write memory” and reload.
Q
How do I recover a Cisco 1800 router with corrupted Flash?
A
Use ROMMON mode, set the boot parameter to load via TFTP, upload a valid IOS image to RAM or Flash, then reboot normally.
Q
Why is my Cisco 1800 router showing “insufficient memory” errors?
A
Errors occur when IOS features exceed available DRAM or Flash. Resolve by disabling unused features, upgrading memory, or using a compact IOS image.
Q
How does increased Flash memory affect Cisco 1800 router performance?
A
Larger Flash allows multiple IOS images, larger configs, and more feature sets, reducing upgrades downtime but does not directly boost runtime throughput.
Q
Are there any power requirements when adding memory modules to a Cisco 1800?
A
No additional power supply is required. Ensure the router is powered off before installing DRAM or replacing CompactFlash to avoid damage.
Q
Can I hot-swap CompactFlash cards on a Cisco 1800 router?
A
No. Cisco 1800 routers do not support hot-swapping CompactFlash. Always power down the router before inserting or removing Flash cards.
Q
What file system does a Cisco 1800 router Flash memory use?
A
Cisco 1800 Flash uses the proprietary Cisco File System (CFS) which supports directory structures and IOS image integrity checks.
Q
How do I back up and restore Cisco 1800 router Flash configurations?
A
Use “copy flash: tftp:” to back up and “copy tftp: flash:” or “copy tftp: system:” to restore IOS images and config files via TFTP server.
