Path trace traces a path through the network from host A to host B. This ability to assure that the correct network services have been put in place. Starting with complete end to end visibility, across each segment or hop over the network and the interactions/connections between them. You can also provide TCP/UDP port information and the controller will look at points in the network where there is multiple paths and let you know which of the possible paths will be used for this flow. In addition you can get device and interface statistics along the active path.
By automating this duty with an assurance solution that provides comprehensive visibility into the network devices and state, and the context to comprehend how to further automatically configure all the devices in the network path to achieve the required performance Intent-based networking provides a continuous loop framework to deliver ongoing protection and alignment to security policy and compliance requirements. The large scale of IoT (Internet of Things) and cloud need such artificial intelligence and machine learning to help analyse the large quantities of data generated from the network and to recommend the appropriate action.
With the DNA Center Platform APIs, you can put path trace to work wherever, whenever you want.
These instructions will get you a copy of the Python code for DNAC path trace up and running on your local machine for development and testing purposes.
- Python 2.7.10 or higher
- Python 3.6.3 or higher
- "git" command line tools
- Homebrew (Mac OS X)
git installation - https://git-scm.com/download/mac
homebrew installation - ruby -e "$(curl -fsSL https://raw.github.com/mxcl/homebrew/go)"
Python 3.6 installation - https://www.python.org/downloads/release/python-364/
Python 2.7 installation - https://www.python.org/downloads/release/python-2714/
Python pip installation
curl -o get-pip.py https://bootstrap.pypa.io/get-pip.py
sudo python get-pip.py
Command Line Developer Tools Installation. After running command, complete installation using the GUI.
xcode-select --install
git installation - https://git-scm.com/download/win
Python 3.6 installation - https://www.python.org/downloads/release/python-364/
Python 2.7 installation - https://www.python.org/downloads/release/python-2714/
Be sure to check box for "Add Python to PATH" during the installer
All of the code and examples for this lesson is located in the 'add me here' directory. Clone and access it with the following commands:
git clone https://github.com/CiscoDevNet/dnac-python-path-trace
cd dnac-python-path-trace
Use pip to install the necessary requirements
pip install -r requirements.txt
- An easy-to-use single Python script for monitoring network health, identifying issue root causes, and helping to remediating issues.
- Troubleshoots issues along the network path. Checking network state, performance levels, and security status, providing context based on locations and devices and realigning resources in order to meet service levels or compliance regulations.
- Provides contextual data analysis, important before, during, and after network changes or deployments to help ensure that the network is delivering the desired results throughout and after the process is complete.
- The machine learning is important in order to create a baseline of performance and security, rapidly identifying any deviation from normal.
If you look at the Python code for our script, you will see the API calls used.
https://{}/api/system/v1/auth/tokenGets and encapsulates user identity and role information as a single value that RBAC-governed APIs use to make access-control decisions.https://{}/api/v1/network-deviceGets the list of first 500 network devices sorted lexicographically based on host name. It can be filtered using management IP address, mac address, hostname and location name.https://{}/api/v1/interfaceGets every interface on every network device. Whilst you can get a list of all interfaces via an API call, it is often more useful to get a subset of them. For example those that are attached to a specific network-device.https://{}/api/v1//hostYou can use the host API to get the name of a host, the ID of the VLAN that the host uses, the IP address of the host, the MAC address of the host, the IP address of the network device to which host is connected, and more.https://{}/api/v1/flow-analysisThe path trace endpoint API to trace a path between two IP addresses. The function will wait for analysis to complete, and return the results
The script path_trace.py requires two arguments to see how this works run the path_trace_prep.py script. In this script we use Argparse is a built in Python module which makes easy to write user-friendly command-line interfaces. The program defines what arguments it requires. Argparse will figure out how to parse those out of sys.argv. We will use Argparse to input our host source and destination IP addresses.
python path_trace.py -h
usage: path_trace.py [-h] source_ip destination_ip
positional arguments:
source_ip Source IP Address
destination_ip Destination IP Address
optional arguments:
-h, --help show this help message and exit
The source and destination IP address of the hosts. The Source and destination can also be addresses of interfaces on network-devices as well.
- Source: Enter the IP address from which you want the trace to start
- Destination: Enter the IP address, hostname, username, or application name at which you want the trace to end
python path_trace.py 10.10.22.98 10.10.22.114
Running Troubleshooting Script for
Source IP: 10.10.22.98
Destination IP: 10.10.22.114
Source Host Details:
-------------------------
Host Name: Unavailable
Network Type: wired
Connected Network Device: 10.10.22.66
Connected Interface Name: TenGigabitEthernet1/0/1
VLAN: 1
Host IP: 10.10.22.98
Host MAC: c8:4c:75:68:b2:c0
Host Sub Type: UNKNOWN
Destination Host Details:
-------------------------
Host Name: Unavailable
Network Type: wired
Connected Network Device: 10.10.22.70
Connected Interface Name: TenGigabitEthernet1/0/24
VLAN: 1
Host IP: 10.10.22.114
Host MAC: 00:1e:13:a5:b9:40
Host Sub Type: UNKNOWN
Source Host Network Connection Details:
---------------------------------------------
Device Hostname: cat_9k_1.abc.inc
Management IP: 10.10.22.66
Device Location: None
Device Type: Cisco Catalyst 9300 Switch
Platform Id: C9300-24UX
Device Role: ACCESS
Serial Number: FCW2136L0AK
Software Version: 16.6.1
Up Time: 144 days, 21:42:05.16
Reachability Status: Reachable
Error Code: None
Error Description: None
Attached Interface:
--------------------
Port Name: TenGigabitEthernet1/0/1
Interface Type: Physical
Admin Status: UP
Operational Status: up
Media Type: 100/1000/2.5G/5G/10GBaseTX
Speed: 1000000
Duplex Setting: FullDuplex
Port Mode: access
Interface VLAN: 1
Voice VLAN: None
Destination Host Network Connection Details:
---------------------------------------------
Device Hostname: cat_9k_2.abc.inc
Management IP: 10.10.22.70
Device Location: None
Device Type: Cisco Catalyst 9300 Switch
Platform Id: C9300-24UX
Device Role: ACCESS
Serial Number: FCW2140L039
Software Version: 16.6.1
Up Time: 144 days, 21:39:55.40
Reachability Status: Reachable
Error Code: None
Error Description: None
Attached Interface:
--------------------
Port Name: TenGigabitEthernet1/0/24
Interface Type: Physical
Admin Status: UP
Operational Status: up
Media Type: 100/1000/2.5G/5G/10GBaseTX
Speed: 1000000
Duplex Setting: FullDuplex
Port Mode: access
Interface VLAN: 1
Voice VLAN: None
Running Flow Analysis from 10.10.22.98 to 10.10.22.114
-------------------------------------------------------
Flow analysis not complete yet, waiting 5 seconds
Number of Hops from Source to Destination: 5
()
Flow Details:
****************************************
Hop 1: Network Device cat_9k_1.abc.inc
Device IP: 10.10.22.66
Device Role: ACCESS
()
Ingress Interface
--------------------
Port Name: TenGigabitEthernet1/0/1
Interface Type: Physical
Admin Status: UP
Operational Status: up
Media Type: 100/1000/2.5G/5G/10GBaseTX
Speed: 1000000
Duplex Setting: FullDuplex
Port Mode: access
Interface VLAN: 1
Voice VLAN: None
Egress Interface
--------------------
Port Name: TenGigabitEthernet1/1/1
Interface Type: Physical
Admin Status: UP
Operational Status: up
Media Type: unknown
Speed: 10000000
Duplex Setting: FullDuplex
Port Mode: routed
Interface VLAN: None
Voice VLAN: None
****************************************
Hop 2: Network Device cs3850.abc.inc
Device IP: 10.10.22.69
Device Role: DISTRIBUTION
()
Ingress Interface
--------------------
Port Name: TenGigabitEthernet1/1/2
Interface Type: Physical
Admin Status: UP
Operational Status: up
Media Type: SFP-10GBase-CX1
Speed: 10000000
Duplex Setting: FullDuplex
Port Mode: routed
Interface VLAN: None
Voice VLAN: None
Egress Interface
--------------------
Port Name: TenGigabitEthernet1/1/3
Interface Type: Physical
Admin Status: UP
Operational Status: up
Media Type: SFP-10GBase-CX1
Speed: 10000000
Duplex Setting: FullDuplex
Port Mode: routed
Interface VLAN: None
Voice VLAN: None
****************************************
Hop 3: Network Device cat_9k_2.abc.inc
Device IP: 10.10.22.70
Device Role: ACCESS
()
Ingress Interface
--------------------
Port Name: TenGigabitEthernet1/1/1
Interface Type: Physical
Admin Status: UP
Operational Status: up
Media Type: unknown
Speed: 10000000
Duplex Setting: FullDuplex
Port Mode: routed
Interface VLAN: None
Voice VLAN: None
Egress Interface
--------------------
Port Name: TenGigabitEthernet1/0/24
Interface Type: Physical
Admin Status: UP
Operational Status: up
Media Type: 100/1000/2.5G/5G/10GBaseTX
Speed: 1000000
Duplex Setting: FullDuplex
Port Mode: access
Interface VLAN: 1
Voice VLAN: None
- Hank Preston - 📧 [email protected]
- Adam Radford - 📧 [email protected]
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