I have a 3560 (ios 12.2(25)) connected to L3 module (ios 12.0(14)) on catalyst 4006.
I can see 3560 as a CDP neighbour on L3 module, but I can NOT see L3 module on 3560 as CDP neighbour
L3 communications are OK.
debug cdp events on 3560 shows:
CDP-EV: Bad checksum in header
show cdp traffic on 3560 shows checksum errors:
Chksum error: 13
cdp v2 ads. are disable on 3560
Can you help me. Thanks.
pd. I know this is little problem because IP communication is OK, but you know costumers...