Fix permissions using the command: /opt/unetlab/wrappers/unl_wrapper -a fixpermissions . 3. Standard QEMU/KVM If running directly via CLI:

To use this in GNS3, you should use the IOS XRv appliance template: Open GNS3 and go to . Select the cisco-iosxrv.gns3a file.

It is a mature release within the 6.x train, known for stable BGP, OSPF, and MPLS implementations.

When you first boot the image, you will likely reach a prompt asking for a username and password. On demo images, you often need to create one: Wait for the "SYSTEM CONFIGURATION COMPLETED" message. Press to get the setup prompt.

Cisco IOS XR is the operating system designed for service provider networks, offering modularity, high availability, and massive scalability. The (Virtual Router) version allows this software to run as a Virtual Machine (VM). The "demo" designation indicates it is a trial or lab-use image, which typically includes a throughput cap (often 2 Mbps) but remains fully functional for protocol testing. Key Technical Specifications Version: 6.1.3 Format: .qcow2 (QEMU Copy-On-Write)

Newer "XRv 9000" images require 16GB+ of RAM. The classic XRv (6.1.3) runs smoothly on 3GB, allowing you to run 10+ routers on a standard laptop.

The .qcow2 format is natively supported by QEMU/KVM, making it the preferred choice for popular network simulation platforms. 1. GNS3 Deployment

qemu-system-x86_64 -m 3072 -hda iosxrv-k9-demo-6.1.3.qcow2 -serial telnet:127.0.0.1:5000,server,nowait Use code with caution. Why Use Version 6.1.3?

The file is a virtual disk image used to run Cisco’s IOS XRv, a virtualized version of the carrier-grade IOS XR software. This specific version is a staple for network engineers and students who need to simulate high-end routing environments without purchasing expensive physical hardware like the ASR 9000 series.

While newer versions like 7.x exist, version 6.1.3 is often preferred for several reasons:

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