We have had this since we installed the Nexus 1010s but I want to get some help to clarify why.
We have 2 Nexus 1010 in HA. One is connected to a Nexus 5596UP vPC pair in one DC. The other connected to a second Nexus 5596UP vPC pair in the other DC. All 4 5596UP run 5.0(3)N1(1). Nexus 1010 run 4.2(1)SP1(3)
We see this message frequently in the logs of the Nexus 5596 switches
2012 Jan 14 17:40:25 NRK-BA01-SW1 %CDP-5-NEIGHBOR_REMOVED: CDP Neighbor NTM-DC-VSA-01(QCI1533A662) on port Ethernet1/30
has been removed
2012 Jan 14 17:40:25 NRK-BA01-SW1 %CDP-5-NEIGHBOR_REMOVED: CDP Neighbor NTM-DC-VSA-01(QCI1533A662) on port Ethernet1/32
has been removed
2012 Jan 14 17:40:25 NRK-BA01-SW1 %CDP-5-NEIGHBOR_REMOVED: CDP Neighbor NTM-DC-VSA-01(QCI1533A662) on port Ethernet1/31
has been removed
2012 Jan 14 17:40:25 NRK-BA01-SW1 %CDP-5-NEIGHBOR_ADDED: Device NTM-DC-VSA-01(QCI1533A662) discovered of type Nexus1010
with port eth0 on incoming port Ethernet1/30 with ip addr 255.255.255.255 and mgmt ip <no MGMT IP Addr Received>
2012 Jan 14 17:40:25 NRK-BA01-SW1 %CDP-5-NEIGHBOR_ADDED: Device NTM-DC-VSA-01(QCI1533A662) discovered of type Nexus1010
with port eth3 on incoming port Ethernet1/32 with ip addr 255.255.255.255 and mgmt ip <no MGMT IP Addr Received>
2012 Jan 14 17:40:25 NRK-BA01-SW1 %CDP-5-NEIGHBOR_ADDED: Device NTM-DC-VSA-01(QCI1533A662) discovered of type Nexus1010
with port eth5 on incoming port Ethernet1/31 with ip addr 255.255.255.255 and mgmt ip <no MGMT IP Addr Received>
I do not see the message at the same time in both switches of a vPC pair.
Do you have management IP configured for Nexus 1010 ?? Alternatively you can launch kvm and turn off cdp on nexus 1010 using "no cdp enable" configuration command till you configure management IP on it.
I have the same issue , even if the management IP is configured.
We were asked to change the CDP timer in Nexus 1010 to 120 secs to resolve this issue. I have still not tried it.. May be you can try it if your setup is still not in production..
Regards