Observer

Observer is an autodiscovering PHP/MySQL/SNMP/CDP based network management system focused primarily on Cisco and Linux/BSD networks. It is capable of of automatically generating network infrastructure diagrams using link data harvested via CDP from Cisco network hardware.

Observer is intended to provide a more navigable interface to the health of your network. It will try to autodiscover physical links between Cisco network infrastructure using CDP tables from SNMP and it will also show devices are on the same broadcast domain using SNMP ip address tables.