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The Timos-sr-13.0.r4-vm.qcow2 image is more than just a disk file—it is a portable, carrier-grade routing plane that can live on a developer’s laptop or integrate into a production OpenStack cloud. By understanding its naming schema, resource needs, and deployment nuances (especially on KVM), you gain the ability to prototype complex MPLS/SR networks without a $50,000 physical chassis.
Remember: treat the image with the same operational respect as a physical 7750 SR. Back up the configuration, license it correctly, and monitor its resource usage. Whether you are preparing for a Nokia certification or automating a global network, mastering this virtual router image is a foundational skill for the modern network engineer.
Next steps: Download the image from the Nokia Support Portal (requires valid service contract), spin it up on your favorite Linux server, and run show system information to see the 13.0.r4 engine come to life.
Given this information, "Timos-sr-13.0.r4-vm.qcow2" seems to be a virtual machine image file that can be used with QEMU or compatible software. Here are a few potential uses or contexts for this file:
To use this file, you would typically need to:
The exact steps can vary depending on your specific virtualization software and the nature of "Timos."
The file Timos-sr-13.0.r4-vm.qcow2 is a virtual disk image containing version 13.0.R4 of the Nokia (formerly Alcatel-Lucent) Service Router Operating System (SR OS). Known as TiMOS (Terabit Interactive Model-driven Operating System), this software powers high-performance carrier-grade routers such as the 7750 SR and 7950 XRS. Purpose and Architecture
The .qcow2 format is specifically designed for use with QEMU/KVM hypervisors, making it a standard choice for network simulation platforms like GNS3 and EVE-NG. This specific image functions as a Virtualized Simulator (vSim), a software-only version of the SR OS intended for laboratory environments rather than production networks.
While the vSim is operationally identical to physical hardware in its control and management planes, its forwarding plane is artificially throttled—often limited to 250 packets per second (pps) per interface—to prevent its use as a free production router. Key Features in Release 13.0.R4
Release 13.0.R4 brought several enterprise and carrier-grade enhancements to the SR OS platform: Timos-sr-13.0.r4-vm.qcow2
Advanced Routing: Support for highly scalable IP/MPLS protocols, including Segment Routing and extensive Ethernet VPN (EVPN) functionality.
High Availability: Features like Nonstop Routing (NSR) and Nonstop Forwarding (NSF) ensure that the control plane can fail over or reboot without interrupting the traffic flow.
Service Delivery: Capabilities for residential broadband (BNG), mobile backhaul (IPsec gateways), and data center interconnect (DCI).
Management: Transition toward model-driven management, allowing for programmatic configuration via APIs and enhanced CLI structures. TiMOS-SR-13.0.R4-vm.qcow2 - Upload Files - UPW.IO
The file "Timos-sr-13.0.r4-vm.qcow2" is a virtual disk image for the Nokia (formerly Alcatel-Lucent) 7750 Service Router (SR) virtualized operating system, known as TiMOS. Technical Specifications Operating System: TiMOS (Nokia SR OS) version 13.0.R4.
Format: .qcow2 (QEMU Copy-On-Write), typically used with QEMU/KVM hypervisors.
Virtual Appliance: Commonly used as part of the Virtualized Simulator (vSim) or Virtualized Service Router (vSR) for lab testing and network simulation. File Size: Approximately 368.5 MB (351.4 MiB). MD5 Checksum: d7a3609e506acdcb55f6db5328dba8ed. Deployment Requirements
To run this image in a simulation environment like GNS3, the following resources are generally required: RAM: At least 2048 MB.
CPU: x86-64 architecture; KVM acceleration is highly recommended for performance. The Timos-sr-13
Default Login: Typically admin for both username and password.
Network Interface: Often configured with e1000 adapter types. Common Usage & Limitations
Simulation Only: The vSim is designed for control and management plane simulation in lab environments and is not intended for production use.
Throughput: The forwarding plane in these simulator versions is often rate-limited (e.g., to 250 pps per interface).
Licensing: Without a valid lic.txt file, the system may reboot automatically every 60 minutes. license not matching TiMOS-B-13.0.R4 - Alcatel Unleashed
To prepare the TiMOS-SR-13.0.R4-vm.qcow2 image for use in network emulators like
, you must configure the QEMU environment with specific hardware parameters and resource allocations. 1. Resource Requirements
The following minimum specifications are required for the image to boot correctly: (2 recommended for smoother operation). Console Type: Alcatel Unleashed 2. Network & Disk Settings
Configure these virtual hardware settings to ensure compatibility with the Nokia SROS: NIC Adapter Type: (standard) or virtio-net-pci Network Adapters: 6 adapters (standard for SROS images). HDD Interface: (primary disk should be 3. Preparation for EVE-NG If you are using , follow these specific naming and directory conventions: Create Directory: Create a folder in /opt/unetlab/addons/qemu/ starting with the prefix timos-13.0.R4/ Rename Image: Upload your file and rename TiMOS-SR-13.0.R4-vm.qcow2 inside that folder. Fix Permissions: Run the EVE-NG permission fix command: /opt/unetlab/wrappers/unl_wrapper -a fixpermissions 4. Advanced: License & UUID Given this information, "Timos-sr-13
To prevent the node from rebooting every 60 minutes, you may need a valid license file ( Alcatel Unleashed Alcatel-Lucent vSR-OS in GNS3 - Nbctcp's Weblog 14 Jan 2015 —
Let’s dissect the filename to understand what we are working with:
It is crucial to note what this file is not. It is not a Linux distribution like Ubuntu; it is a specialized network operating system. It does not have a general-purpose compiler or a GUI desktop. Furthermore, while the control plane (the logic that calculates routes) runs perfectly in a VM, the data plane (the speed at which it forwards packets) is limited. Physical routers rely on ASICs to forward packets at 400 Gigabits per second; the .qcow2 version relies on the host server's CPU, typically maxing out at a few gigabits per second. Therefore, while it is perfect for lab testing, control-plane learning, and edge virtualization, it cannot replace a physical chassis in a core internet backbone.
When you boot this image, you aren't getting a stripped-down Linux router. You are getting a purpose-built network operating system.
The Timos-sr-13.0.r4-vm.qcow2 file represents a solid, stable piece of network engineering history. Whether you are studying for your NRS II or just want to lab up some Segment Routing topologies, having a working copy of SR OS 13.0.R4 in your KVM arsenal is invaluable.
Have you migrated to newer versions like SR OS 21 or 23, or do you still stick to 13 for stability? Let me know in the comments!
Disclaimer: This post is for educational purposes. Ensure you have the proper licenses and permissions to use Nokia software images. Always adhere to vendor EULAs when setting up virtual labs.
The string Timos-sr-13.0.r4-vm.qcow2 refers to a virtual machine disk image for Nokia SR OS (Service Router Operating System).
Here is the breakdown of the naming convention and its typical use:
Nokia’s naming convention tells you everything you need to know:
qemu-img convert -f qcow2 -O raw timos-sr-13.0.r4-vm.qcow2 timos-sr.raw