CDP shows only one of four etherchannel links on one side

[CapUcisco]

I have 2 switches (3550s) connected in a 4 interfaces LACP trunk.

Show etherchannel summary shows all ports happy on both sides.

However, show cdp neighbors shows 4 interfaces on one switch, but only 1 interface on the other switch.

Restarting the port-channel didn't fix the problem.

All interfaces are configured the same.

What would be the problem?

Thank you!

[Reza Sharifi]

On the other switch where you see only one interface, make sure CDP is enabled globally.

It maybe currently enabled only on one interface.

HTH

[CapUcisco]

CDP is by default enabled globally

I've restarted all switches and now the second switch sees 3 out of 4 interfaces. Odd.
 

[CapUcisco]

I forgot to mention that I also have a loop in that network (there are 2 other switches)

I'm trying to figure out what the cause of the loop is:

%SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9a5.097d in vlan 171 is flapping between port Po47 and port Po41
May 11 07:24:57.374 PDT: %SW_MATM-4-MACFLAP_NOTIF: Host 000c.316f.cc00 in vlan 171 is flapping between port Po47 and port Po41
May 11 07:26:10.113 PDT: %SW_MATM-4-MACFLAP_NOTIF: Host d4be.d9a5.097d in vlan 171 is flapping between port Po47 and port Po41
May 11 07:26:10.977 PDT: %SW_MATM-4-MACFLAP_NOTIF: Host 000b.5f7a.aa80 in vlan 171 is flapping between port Po47 and port Po41
May 11 07:26:12.849 PDT: %SW_MATM-4-MACFLAP_NOTIF: Host c89c.1d4f.1ec6 in vlan 171 is flapping between port Po41 and port Po21