Symptom

When enabling SPAN session on N1k the source in the SPAN will become un-reachable until you disable the monitor session. SPAN Sample Config: (config)# show monitor session 1 session 1 --------------- type : local state : Up source intf : rx : Veth5 tx : Veth5 both : Veth5 source VLANs : rx : tx : both : source port-profile : rx : tx : both : filter VLANs : 106 destination ports : Veth6 destination port-profile :

Conditions

Running 5.2(1)SV3(1.5a) and ESXi 6.0 VEM module and have a SPAN session setup and enabled.

Workaround

Turn SPAN session off If diagnosing issue and packet captures are needed then follow the guide located below to perform a vempkt capture: http://www.cisco.com/c/en/us/support/docs/switches/nexus-1000v-switch-vmware-vsphere/115763-vempkt-capture-traffic-nexus1000.html

Further Problem Description