I am attempting to update our network diagrams and am finding with some sites that the neighbours do not show up.
CDP is enabled on the switch and router from what I can tell.
The router is a 3550 and switch is a 2950, for this particular site the core router will not show any neighbours, although if you connect to a switch it will show the router.
As with some switches will show their neighbours and others will not.
Any pointers in what to check, or even with this occuring is there an easy way to find out neighbours of a device without CDP working.