Cisco Cml Refplat Iso [better] Download Patched

Cisco CML Refplat ISO Download: Patched vs. Standard Reference Platforms

The Cisco Modeling Labs (CML) Reference Platform ISO—often called the refplat ISO—is a foundational requirement for any network simulation. While standard releases provide a base set of images, "patched" or updated versions are frequently released to fix bugs, add new node types, or provide security updates for the virtual operating systems. Understanding the Refplat ISO

The refplat ISO is separate from the CML controller OVA. While the OVA contains the management interface and software, the ISO contains the actual VM images for Cisco nodes like IOSv, IOSvL2, ASAv, and Catalyst 9000v.

Standard ISO: Included with every major version release (e.g., CML 2.8 or 2.9).

Patched/Updated ISO: Periodically released to address specific image bugs. For example, version 20201110-fcs replaced the older 20201020-fcs to include crypto-enabled IOSv images and fixed node definitions.

Supplemental ISO: Starting with CML 2.9, Cisco provides a supplemental ISO that includes high-resource images like Catalyst 9800-CL and Cisco ISE, though these are typically not included in the CML-Free tier. How to Download the Latest Patched ISO

Downloading the correct files requires an active Cisco account and a valid license for CML-Personal, Personal Plus, or Enterprise. cisco cml refplat iso download patched

Cisco Modeling Labs (CML) relies on a Reference Platform (refplat) ISO to provide the virtual machine images—such as IOSv, NX-OSv, and ASAv—required to run network simulations. For users seeking a "patched" or most up-to-date version, it is essential to understand that Cisco typically releases cumulative ISO updates rather than individual patches for the ISO itself. Official Sources for CML Refplat ISO Downloads

To ensure security and compatibility, you should only download these files from authorized Cisco Software Central (SWC) portals.

CML Personal Users: Log into the Cisco Learning Network Store, locate your active order, and click Download to be redirected to the specific "patched" or latest release page.

CML Free Tier: Register via the CML-Free Sign-up page to access the free downloads, which currently include a subset of five nodes.

Latest Stable Version: As of late 2024/early 2025, the standard reference platform is often identified by a filename like refplat-20241016-fcs.iso. Understanding "Patched" Refplat ISOs

In the context of CML, "patched" usually refers to one of two scenarios: Cisco CML Refplat ISO Download: Patched vs

Supplemental ISOs: Cisco sometimes releases a "supplemental" ISO (e.g., refplat-20241016-supplemental.iso) containing newer or specialized images like SD-WAN Controllers or Catalyst 9000v that were not in the base release.

Cumulative Updates: Newer CML server versions (e.g., 2.8 or 2.9) often come with a refreshed base ISO that includes the latest software fixes for the virtual images. How to Apply the Latest Refplat to Your CML Instance CML Installation Guide - Cisco Modeling Labs v2.9

Note to the reader: This post assumes you have a valid Cisco account (CCO) or access to Cisco Modeling Labs via an authorized channel (e.g., Learning Store, VIRL license).

How to download the official ISO:

1. Go to Cisco Software Central (software.cisco.com).
2. Log in with your Cisco.com credentials (tied to a valid CML contract or smart account).
3. Navigate to: Downloads Home > Products > Cloud and Systems Management > Modeling Labs > Cisco Modeling Labs.
4. Select the latest version (e.g., CML 2.7 or 2.8).
5. Download the file named something like: cml-refplat-2.7.0-xxx.iso

3. The Bootloop / Installer Fix (The Bug Fix)

Early versions of CML REFPLAT (2.0, 2.1) had a bug where the installer would crash if the disk was not exactly /dev/sda or if UEFI secure boot was enabled. Patching the ISO meant modifying the GRUB bootloader parameters to avoid these install failures.

Summary: If you are a professional, you should never use a "license-patched" ISO. You might need a "hardware-patched" ISO for bare-metal installations on unsupported hardware.

Step-by-step to create a driver-patched ISO:

Prerequisites: A Linux workstation (Ubuntu 22.04). How to download the official ISO:

1. Mount the official ISO:

   mkdir /mnt/cml_iso
   mount -o loop cml-refplat-2.7.0.iso /mnt/cml_iso
   

2. Extract the contents:

   cp -r /mnt/cml_iso /tmp/cml_build
   

3. Extract the INITRD (Initial RAM Disk): This is where the drivers live.

   cd /tmp/cml_build
   mkdir initrd_extract
   cd initrd_extract
   zstd -d ../casper/initrd.zst | cpio -id
   

4. Inject a missing driver (Example: Realtek R8169): Download the latest DKMS source for your NIC. Compile it into a .ko (kernel object) and copy it into the lib/modules/ directory within the extracted initrd.

5. Rebuild the INITRD:

   find . | cpio -o -H newc | zstd > ../casper/initrd.zst
   

6. Repack the ISO:

   xorriso -as mkisofs -r -V "CML_REFPLAT_PATCHED" -J -joliet-long -cache-inodes \
   -b isolinux/isolinux.bin -c isolinux/boot.cat -boot-load-size 4 -boot-info-table \
   -no-emul-boot -eltorito-alt-boot -e boot/grub/efi.img -no-emul-boot \
   -isohybrid-gpt-basdat -o cml-refplat-2.7.0-patched.iso /tmp/cml_build
   

This process is complex. Most engineers who need a "patched" ISO for hardware compatibility simply use VMware ESXi or Proxmox VE instead of bare metal, because the virtual hardware is standardized and the official ISO works perfectly as a VM guest.

Legitimate alternatives to a patched ISO:

| Option | Cost | Limitations | |--------|------|--------------| | Cisco CML Free | Free (requires Cisco account) | 2 nodes max, no external connectivity, some features limited | | CML Personal | ~$199/year | 20 nodes, local installation, full feature set | | Cisco DevNet Sandbox | Free (reservations) | Remote lab, temporary access | | EVE-NG Community | Free | Bring your own Cisco images (requires legal access) | | PNETLab | Free | Similar to EVE-NG, also requires legal images |