Based onthe orifinal with fixes frr-ospfcli2dot - takes the output of "show ip ospf database router"and optionally a hostfile outputs a GraphViz DOT file corresponding to the network topology
usage: frr-ospfcli2dot [-h] [--hosts_file HOSTS_FILE]
[--ip_decimal IP_DECIMAL] [--add_stubs ADD_STUBS]
[--force_output FORCE_OUTPUT]
source_file destination_file
Extract Topology from OSPF
positional arguments:
source_file The file name for the input OSPF Database text file
destination_file The file name for the output dot file
optional arguments:
-h, --help show this help message and exit
--hosts_file HOSTS_FILE
The file name for the input Host Names Database text
file
--ip_decimal IP_DECIMAL
Print IP in decimal format
--add_stubs ADD_STUBS
Print Stub networks in node
--force_output FORCE_OUTPUT
Don't check for output file
This is the original - for other OS.
Converts the output of Cisco IOS command "show ip ospf database router" into a GraphViz DOT file.
GraphViz can then plot the DOT file into a vertex / edge style graph depicting your network topology and the associated OSPF costs. Any asymmetric link costs (different cost set on each end of the link) show up in red.
The script seems to also work with the output of Cisco ASAs and IOS-XE (it is basically identical to that of IOS).
Support has been added for broadcast networks. At the moment it just shows the DR as opposed to the full network / mask as this information is not available in the output of "show ip ospf database router". I may add support to populate the missing details from the output of "show ip ospf network" later.
This release adds support for a unix format hostfile, if the router isn't able to resolve the hostnames for itself, and also allows automatic group creation based on hostnames. Simply tell it what your separator is and whether to use the first or last part as the site ID. Simple but handles common hostname formats like "rtr1.site" or "site-rtr1".
The script juni-ospfcli2dot.py takes the output of "show ospf database extensive" on JunOS devices and performs the same function.
These scripts require Python 3.
Set all python files as executable (chmod 755 *.py) then run
Run python 3 then execute:
exec(open("./ospfcli2dot.py").read())
foeh@feeble ~ $ ./ospfcli2dot.py ospfcli2dot - takes the output of "show ip ospf database router" and optionally a hostfile outputs a GraphViz DOT file corresponding to the network topology
v0.4 alpha, By Foeh Mannay, September 2018
Enter input filename: cli-output.txt
Enter hostnames file or press enter to continue without one: hosts
If you want to group by hostname, enter the separator now
(or press enter to continue): -
Do you want to group by the [f]irst or [l]ast part of the hostname? f
Enter output filename: mytopology.dot
foeh@feeble ~ $
Several applications can deal with DOT files.
Example: Native graphviz "dot" processor to output a .gif file:
foeh@feeble ~ $ dot -Tgif -omytopology.gif mytopology.dot
(Or use xdot under Linux / gvedit under Windows to see it directly)
My Python is pretty scruffy but it seems to work.
Not really my bug but the output of this script is really good at upsetting the graphviz "Error: trouble in init_rank" bug - I was pulling my hair out with this for the longest time but they have now fixed the layout engine. Upgrade to v1.4 or later and it should magically go away.