SNMP LLDP

Build LLDP tree from SNMP information

Prerequisites

Net-SNMP with python bindings
Be able to resolve device IP from name reported through LLDP
Same SNMP community configured on all devices

Limitations

Currently this script only handles LLDP for HP ProCurve and Juniper JUNOS devices
HP ProCurve firmware I.10.43 and perhaps the whole I-series seems to lack OIDs for model, firmware version, serial number.
Juniper JUNOS older than version 11 seems to lack LLDP OIDs
Script can only reach devices which report a resolvable hostname over LLDP and have the same SNMP community configured.
SNMP version 1 and 2 only
If a device is connected to another with several ports, only the first port gets registered in the tree.

Future features

Network interface information
VLAN information

lldp.py usage

Run the script with hostname of a SNMP and LLDP enabled device as argument. That device will become root of the generated lldp tree structure.

usage: lldp.py [options] COMMAND HOST

positional arguments:
  COMMAND               list or tree (default: list)
  HOST                  hostname or IP address

optional arguments:
  -h, --help            show this help message and exit
  -c COMMUNITY, --community COMMUNITY
                        SNMP community (default: public)
  -q, --quiet           Do not display or log errors
  -l LOGFILE, --logfile LOGFILE
                        Log file (Default is logging to STDERR)
  -o OIDFILE, --oidfile OIDFILE
                        JSON file containing SNMP OIDs (default: oid.json)

If COMMAND is list, the JSON output to STDOUT is a list of hostnames detected recursively through LLDP.

[
    "switch001.example.net",
    "switch008.example.net",
    "switch036.example.net",
    # output truncated
]

If COMMAND is tree, output is JSON tree structure in following format:

{
    "id": "switch001.example.net",
    "children": [
        {
            "id": "switch008.example.net",
            "children": [
                {
                    "id": "switch036.example.net"
                },
                {
                    "id": "switch005.example.net"
                },
                {
                    "id": "switch001.example.net",
                    "children": [
                        {
                            "id": "switch028.example.net"
                        },
                        {
                            "id": "switch019.example.net"
                        },
                        {
                            "id": "switch014.example.net"
                        },
                        {
                            "id": "switch032.example.net"
                        },
                        {
                            "id": "switch045.example.net",
                            "children": [
                                {
                                    "id": "switch056.example.net"
                                }
                            ]
                        }
            # output truncated
                    ]
                }
            ]
        }
    ]
}

getinfo.py usage

getinfo.py is designed to be run with lldp.py list output as input, either through stdin (pipe, for example) or by specifying a text file with the '-f' flag. Something like this:

export SNMPCOMMUNITY=secretcommunity
lldp.py list switch001.example.net | getinfo.py > deviceinfo.json
-or-
lldp.py list switch001.example.net > list.json
getinfo.py -f list.json
-or-
lldp.py list switch001.example.net > list.json
cat list.json | getinfo.py

Other flags:

usage: getinfo.py [-h] [-f INPUTFILE] [-c COMMUNITY] [-q] [-l LOGFILE]
                  [-o OIDFILE]

optional arguments:
  -h, --help            show this help message and exit
  -f INPUTFILE, --inputfile INPUTFILE
                        File to read list of devices from (defaults to reading
                        from stdin)
  -c COMMUNITY, --community COMMUNITY
                        SNMP community (default: public)
  -q, --quiet           Do not display or log errors
  -l LOGFILE, --logfile LOGFILE
                        Log file (Default is logging to STDERR)
  -o OIDFILE, --oidfile OIDFILE
                        JSON file containing SNMP OIDs (default: oid.json)

graph.py usage

Prerequisites:

pydot library

graph.py is designed to be run with getinfo.py output as input, either through stdin (pipe, for example) or by specifying a text file with the '-f' flag. A device has to be specified to put in the root of the graph. Something like this:

export SNMPCOMMUNITY=secretcommunity
lldp.py list switch001.example.net | getinfo.py > deviceinfo.json
cat deviceinfo.json | graph.py -o graph.png switch001.example.net

Other flags:

usage: graph.py [-h] [-i INFOFILE] [-o OUTFILE] [-l LOGFILE] [-q] [-v] ROOT

positional arguments:
  ROOT                  Device to put as root of the graph

optional arguments:
  -h, --help            show this help message and exit
  -i INFOFILE, --infofile INFOFILE
                        File to read info about devices from (default:
                        info.json, failing that: stdin)
  -o OUTFILE, --outfile OUTFILE
                        File to write to (default: graph.png)
  -l LOGFILE, --logfile LOGFILE
                        Log file (default is logging to STDERR)
  -q, --quiet           Do not display or log errors
  -v, --verbose         Increase verbosity when using logfile.

License

This file is part of snmp-lldp.

snmp-lldp is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

snmp-lldp is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with snmp-lldp. If not, see http://www.gnu.org/licenses/.