Cisco MEM-FLSH-8G
8G eUSB Flash Memory for Cisco ISR 4430.
Product Highlights
When a Cisco ISR 4430 router loses its flash memory or you need a verified spare on the shelf, downtime is not an option. The Cisco MEM-FLSH-8G is the factory-default 8 GB eUSB flash memory module designed for the Cisco ISR 4430 (4431) router platform.
This eUSB flash module stores the Cisco IOS XE software image that the router boots from, making it one of the most critical internal components in the chassis. Without a functioning flash card, the router cannot boot. The MEM-FLSH-8G provides 8 GB of reliable, Cisco-qualified flash storage — the same capacity that ships standard with every ISR 4431.
Whether you are replacing a failed flash module, building a spares inventory for your branch network, or provisioning new ISR 4430 deployments, the MEM-FLSH-8G delivers a straightforward, field-serviceable solution. Installation requires removing the chassis cover and fan tray, seating the module on the internal connector, and securing it with a single screw. For environments that demand additional flash capacity for larger IOS XE bundles or local file storage, Cisco offers upgrade paths to 16 GB and 32 GB eUSB modules.
Features & Benefits
Factory-Default Bootflash Storage
The MEM-FLSH-8G is the standard 8 GB eUSB flash module that ships with every Cisco ISR 4431 router. It stores the Cisco IOS XE software image the router boots from, ensuring reliable startup and operation. Keeping a spare on hand means you can restore service in minutes rather than waiting for a replacement shipment.
Cisco-Qualified Reliability
As a genuine Cisco flash memory module, the MEM-FLSH-8G is validated and tested for the ISR 4000 Series platform. Using Cisco-qualified flash avoids the compatibility and reliability risks associated with third-party alternatives, protecting system performance during normal network operation.
Simple Field Replacement
Installing the MEM-FLSH-8G is a straightforward internal procedure. Power down the router, remove the chassis cover and fan tray, seat the eUSB module on the flash connector, and secure it with the supplied screw. After installation, boot the router from an external USB to transfer the IOS image to the new flash.
Scalable Flash Capacity
The 8 GB default capacity is sufficient for standard Cisco IOS XE images. When your deployment requires larger software bundles or additional on-device file storage, Cisco offers in-place upgrade options to 16 GB (MEM-FLSH-8U16G) and 32 GB (MEM-FLSH-8U32G) eUSB flash modules for the ISR 4430.
Deployment Scenarios
Spares Inventory for Branch Networks
Organizations managing dozens or hundreds of Cisco ISR 4431 routers across branch offices benefit from stocking MEM-FLSH-8G modules as critical spares. A failed flash module prevents the router from booting entirely, so having a replacement on-site or in a regional depot dramatically reduces mean time to repair.
Flash Module Replacement After Failure
If an ISR 4431's internal bootflash becomes corrupted or fails, the MEM-FLSH-8G provides a direct, drop-in replacement. After physical installation, the IOS XE image and configuration can be restored from a USB drive or network source to bring the router back online.
New Router Provisioning and Staging
When staging ISR 4431 routers for deployment, verified flash modules ensure each unit has a known-good bootflash. The MEM-FLSH-8G allows IT teams to pre-load IOS XE images and configurations during the staging process before shipping routers to remote sites.
General
Technical
Compatibility
Installation
Compatibility Notes
Compatible Platforms:
- Cisco ISR 4431 (ISR 4430 Series)
Spare Part Number: MEM-FLSH-8G= (orderable as a service spare)
Installation Notes:
- Installation requires powering down the router and removing the chassis cover and fan tray.
- After installing a new flash module, the router must be booted from an external USB flash drive to transfer the Cisco IOS XE image to the new bootflash.
- The new eUSB flash does not ship pre-configured with an IOS image.
Upgrade Options:
- MEM-FLSH-8U16G — 8G to 16G eUSB Flash Memory Upgrade for Cisco ISR 4430
- MEM-FLSH-8U32G — 8G to 32G eUSB Flash Memory Upgrade for Cisco ISR 4430
Downloads & Resources
Frequently Asked Questions
| Part Number | Product | Key Difference |
|---|---|---|
| MEM-FLSH-8U16G | 8G to 16G eUSB Flash Upgrade for ISR 4430 | Upgrades the ISR 4430 from 8G to 16G eUSB flash for larger IOS XE images and additional file storage. |
| MEM-FLSH-8U32G | 8G to 32G eUSB Flash Upgrade for ISR 4430 | Upgrades the ISR 4430 from 8G to 32G eUSB flash — maximum flash capacity for the platform. |
| MEM-FLSH-4G | 4G eUSB Flash Memory for ISR 4300 | Default 4G eUSB flash for ISR 4300 Series (4321/4331/4351) — not compatible with ISR 4430. |
| MEM-FLASH-8G= | 8G Compact Flash for ISR 4450 | CompactFlash (not eUSB) form factor designed for the ISR 4451-X — not interchangeable with MEM-FLSH-8G. |