Cisco HyperFlex Edge
2019-12-04
2/3/4-Node Cluster no Fabric-Interconnects (FIs) Edge-Servers connected to LAN-Switches „back-to-Back“-Option for 2-Node Cluster only „RF2“-redundancy Read More →
Cisco HyperFlex Enterprise License
2019-12-04
Beitrag ansehen Performance All-NVMe Cluster HyperFlex Acceleration Engine Scaliabilty 2:1 Compute-to-Converged Nodes-Ratio Data Protection Stretched Cluster (Metro Availability) „Cisco HyperFlex Premier“-Cisco Data Center Enterprise Agreement TierRead More →
Cisco HyperFlex Sizer
2019-12-04
HX Profiler VM collects information for 30 days RV Tools leverages Information from vCenterRead More →
Python Scapy: Wait for CDP-Neighbor
2018-11-02
After provisioning a new Cisco CSR1000V-Router this script waits until the router is fully deployed got it’s Management-IP-Address assigned via DHCP. and returns this Management IP-Address. Prepare First, install „netaddr“-package. needed to check, if the management-IP of the CDP-Neighbor is in the correct IP-Subnet the „wait-for-CDP“-Script Obviously far to much hard-coded stuff, just as an example 😉 waiting for a CDP-Neighbor to appear with the following properties: hostname „CSR-A“ an IP-Address within the network „192.168.56.0 /24“ at the interface VirtualBox Host-Only-Network Provision a new CSR1000V Router named „CSR-A“ Run the „wait-for-CDP-Neighbor“-Script In a second CMD-Box, and… Be patient, of course. Or store the returned IP-AddressRead More →
Python Scapy: Capturing „Cisco Discovery Protocol (CDP)“
2018-10-31
It’s hard to believe, how easy it is to capture (and to craft) LAN-Data using Python Scapy. I need to capture CDP-Packets and to extract information like the hostname of the sender and it’s IP-Address. As an modification of the „ARP-Monitor“-example taken from the manual Using scapy in your tools. Scapy Installation nothing special: pip install Python: Install Scapy Example: List all Interfaces of my Laptop Capture 10 Packets on a specific interface Capture CDP-Packets Decode CDP (with inactive dissector) Activate the CDP-Parser Capture again and display CDP-Information as cleartext Decode CDP-Hostname Decode CDP-Management-IP-AddressRead More →
Scripted provisioning of a Cisco CSR1000V as VirtualBox-Guest: Slipstream initial startup-config
2018-10-25
To enable immediate remote-access to brandnew deployed virtual Cisco CSR1000V-Routers by scripts, ansible etc. it’s necessary to predeploy the startup-config at least with public-rsa-keys etc. Prepare Download and install the nice tool http://CDBurnerXP. This will install a companion cli-tool cdbxpcmd.exe along with the GUI-Version. It’ll be used to prepare an ISO-„CDROM“ containing the prepared „startup-config“-file. Prepare Prepare an IOS-XE Configuration file… Modify the existing script These commands create the ISO-File in the %LOC%-Path. Mount this ISO to the VM The contained config-file will get automatically applied when the router boots the first time. Run the VM the config-file gets applied access the router This dependsRead More →
Scripted provisioning of a Cisco CSR1000V as VirtualBox-Guest
2018-10-23
In a lab environment it might be handy to quickly rollout new (virtual) routers without much manual intervention. The following script creates a VirtualBox-VM and boots it up. Prepare Install VirtualBox and have a CSR1000V-ISO-File ready. Execute The Inventory populates: Use it After another reboot the serial console can be accessed by a windows pipe: The pipe provides access to the serial-console:Read More →
Cisco IOS – Public-Key User-Authentication
2018-10-20
It’s a two step process to get rid of insecure username/password-authentication. Generate a RSA keypair at your SSH-client btw. Cisco-IOS doesn’t support DSA-keys Configure your network device(s) to assign the (public-)key of this keypair to an user-account This user-account could get privileges from a Radius/TACACS+-Server which could provide access-logs, too. Generate RSA-Key: Windows as SSH-Client I prefer Putty, usually in form of „mRemoteNG“, so i use PuttyGen to generate the RSA keypair. Windows.Start => PuttyGen (x) RSA, 4096-bits are supported, use it [Generate] move the mouse to improve the randomgenerator change the „comment“ – for example replace it by an username add a passphrase –Read More →
COT – Common OVF Tool
2018-10-15
…this article should have been published at 2017-11-23, i forgot to press the right botton. So, an update might be needed, anyone still interested in cot today? Release 2.1 (2018-01-29) is the current release, containing some fixes (https://github.com/glennmatthews/cot/blob/master/CHANGELOG.rst) COT installation using PIP So, let’s go, following thats embarassing. Install PIP first Try it again Optional: Argument-Completion Not essential, but handy. COT helpers A full installation requires so called „cot-helpers“ to use all features. first fix „fatdisk“ which is used to inject configs into OVA-Files uncomment to and run the helper-installation again: But it threw a lot of warnings..warning: format ‘%lu’ expects argument of type ‘longRead More →
Cisco IOS Service-Containers: Run an x86-VM inside a Router (Part 5: Install the Service-VM)
2018-02-12
The CSR1000V-Router has already been prepared (Create a CSR1000V-Instance with nested Virtualiation support) and in (Part 4: Package the Service-VM into an OVA) we copied the OVA-Image of our „ubuntu-server“-VM to this Router. Add the internal Network-Interface between Router and Service-VM Install the Service-VM Activate the installed Service-VM Access the VM using the (virtual) Serial-Console Logout: 3x [CTRL]+ Access the VM using SSH via the internal Network Check the local python/NAPALM-Setup to get facts about the containing routerRead More →