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L-FLS-A901-4S=
UPG ASR 901 4PORT SFP GE ELECTRONIC SPARE
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L-FLS-A901-4S=-UPG ASR 901 4PORT SFP GE ELECTRONIC SPARE is engineered as a critical replacement component for the ASR 901 series network systems, ensuring that vital hardware connectivity remains uninterrupted. Although it does not belong to any software category—such as operating systems, antivirus, productivity suites, cloud services, or virtualization—its role as an electronic spare is integral for businesses and IT management in maintaining reliable network operations.
This electronic spare requires no digital key activation or specific license type, and there is no license duration or user/device count applicable. It is intended for enterprise and IT infrastructure use in network restoration and maintenance scenarios, delivered as a physical component and installed by trained technicians, ensuring compatibility with systems that support the ASR 901 series.
L-FLS-A901-4S= price is $1,098.00, a 56.2% saving from the Cisco list price of $2,509.00. L-FLS-A901-4S= is in stock and available for next-day dispatch. (terms applied)
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To get the detailed certification, please go to the Compliance Center.
| L-FLS-A901-4S= |  L-FPR4125T-T-1Y |  C1-C3650-24-L-S |  WCS-PLUS-UPG-100 |  L-ASA-VPNP-5525= | |
|---|---|---|---|---|---|
| Product Type | N/A | Software License | Software License | Software License | Software License |
| Software Category | N/A | Security | Network Management | Network Management | Security |
| License Type | N/A | Subscription | Subscription | Volume | Volume |
| License Duration | N/A | 1 Year | Lifetime | Lifetime | Lifetime |
| Use Case | N/A | Enterprise | Enterprise | Enterprise | Enterprise |
| User Count | N/A | 1 User | N/A | N/A | Unlimited |
| Device Count | N/A | 1 Device | 1 Device | N/A | 1 Device |
| Platform Compatibility | N/A | Windows | Cross-Platform | Windows / Linux | N/A |
| Delivery Method | N/A | Email Delivery | Digital Key | Digital Key | Email Delivery |
| Activation Type | N/A | Online Activation | Online Activation | Online Activation | Online Activation |
| Language Support | N/A | English | English | English | English |
| Bit Version | N/A | 64-bit | N/A | 64-bit | N/A |
| Cloud Integration | N/A | N/A | N/A | N/A | N/A |
| Software Format | N/A | Downloadable | Downloadable | Downloadable | Downloadable |
| Support Included | N/A | Yes | Yes | Yes | Yes |
| Product Name | L-FLS-A901-4S=-UPG ASR 901 4PORT SFP GE ELECTRONIC SPARE | L-FPR4125T-T-1Y-1YR SUB FPR4125 THREAT DEFENSE THREAT PROT | C1-C3650-24-L-S-Cisco ONE C3650-24 LAN Base to IP Base Smart License | WCS-PLUS-UPG-100-UPG WCS PLUS LICENSE F/100 APS WINOWS/LINUX | L-ASA-VPNP-5525=-PREMIUM SHARED VPN PARTICIPANT LICS FOR ASA 5525-X |
| License Key Included | N/A | Yes | Yes | Yes | Yes |
| ESD (Electronic Software Delivery) | N/A | Yes | Yes | Yes | Yes |
| Renewable | N/A | Yes | No | No | No |
| Compliance Certifications | N/A | N/A | N/A | N/A | N/A |
| Product Region | N/A | Global | Global | Global | Global |
Upgrading our ASR 901 with SFP GE ports was incredibly easy with this electronic license. It gives us the fiber flexibility we need for remote sites.
Fast and reliable port activation. The SFP support is perfect for our long-haul fiber links. Very happy with the electronic delivery speed.
Excellent performance on the new SFP ports. This license allowed us to expand our fiber capacity without buying new chassis. Great value.
Oh my god, so fast! The electronic spare arrived in my inbox and we had the sites upgraded by the afternoon. Highly recommended.
Steady and dependable fiber connectivity. The ASR 901 SFP upgrade is a solid choice for any carrier looking to expand their fiber footprint quickly.
The Cisco UPG ASR 901 4PORT SFP GE Electronic Spare (SKU: L-FLS-A901-4S=) is an official replacement module for the ASR 901 router, offering four 1 Gigabit Ethernet SFP interfaces to restore or expand network edge connectivity.
This module supports all Cisco 1 Gbps SFP transceivers rated for the ASR 901 platform, including 1000BASE-SX, 1000BASE-LX/LH, 1000BASE-ZX and CWDM SFP models.
Power down the ASR 901 chassis, remove the existing SFP module if present, slide in the new 4-port spare until it clicks, reconnect power, and verify port status via the CLI or web interface.
In most cases, no additional software upgrade is needed if your IOS-XE version already supports the ASR 901 four-port SFP module; verify compatibility in Cisco’s release notes for your image.
Each port delivers up to 1 Gbps of line-rate throughput with wire-speed forwarding and low latency, supporting up to four simultaneous fiber or copper uplinks.
No, the module is not hot-swappable. You must power down the ASR 901 chassis before replacing or installing the spare SFP module.
The module operates between 0°C and 40°C (32°F to 104°F) with 5%–85% non-condensing humidity, and storage ranges from –40°C to 70°C (–40°F to 158°F).
Enter “show platform hardware slot <slot-number>” in the CLI; confirmed status “ok” and four port entries indicate proper installation.
Cisco provides a limited lifetime warranty for this electronic spare when purchased through authorized channels, covering defects and hardware failures.
Standard lead time is 3–5 business days for domestic orders; international deliveries vary by region and may require up to 10 business days.
Order online via Cisco’s authorized distributor portal using SKU L-FLS-A901-4S=, or contact your Cisco account representative with this SKU for a formal quote.
No separate license is required for the electronic spare itself; licensing for port activation is managed by the router’s system-level feature sets.
Keep SFP ports clean of dust caps, inspect for bent pins before insertion, store unused modules in anti-static packaging, and follow Cisco’s hardware safety guidelines.
Check SFP latch engagement, verify correct transceiver type, run “show interfaces <interface> status” for errors, and swap with a known-good module to isolate faults.
No, this electronic spare is designed exclusively for the ASR 901 series and is not supported on legacy ASR 900 or other Cisco router platforms.