Sh cdp not displaying

[londint]

We have all our edge - access switches connected to 2 core switches.

When I do a sh cdp nei on one switch, I see all these access switches but when I do the same on the second switch I do not see them at all although they are physically connected to this switch. Topology Service within CiscoWorks also does not pick them up.

Trunking is set to ON at both ends.

What am I missing here?

Thanks for your help

[lgijssel]

cdp can be disabled per interface by the command: no cdp enable.

Or is that too simple? Blocked ports could not cause this kind of behaviour as CDP is also active on blocked links.

[londint]

No, I do not want to disable cdp and cdp is currently enabled on all switches.

Thanks

[mulhollandm]

Are their IP addresses in the same Vlan?

[londint]

Thanks you so very much. I dont know why and when it happened but it looks as if a code upgrade at some time disabled the cdp on some of the switches as it was never done manually.

So now I can see all.

Thanks

[londint]

Thanks you so very much. I dont know why and when it happened but it looks as if a code upgrade at some time disabled the cdp on some of the switches as it was never done manually.

So now I can see all.

Thanks

[efrahim]

It could be possible is the cdp is disabled on those interface --

Can you post the output of sh cdp from both the switch- the second switch and the access switch it can't see..

sh cdp port, sh cdp, sh port--- from both switches..

thanx

[londint]

Thanks you so very much. I dont know why and when it happened but it looks as if a code upgrade at some time disabled the cdp on some of the switches as it was never done manually.

So now I can see all.

Thanks