Only 1 of 2 monitor sessions active

[crackedHead]

Using: Cisco Nexus 3524, with 6.0(2)A7(2).

My problem is that for a particular packet feed, going from Eth1/10 to Eth1/20, I can only monitor the flow of packets once - I want redundant feeds. The monitors are defined like this:

monitor session 1
  source interface Ethernet1/10 both
  destination interface Ethernet1/11
  no shut
monitor session 2
  source interface Ethernet1/20 both
  destination interface Ethernet1/21
  no shut

The destination interfaces:

interface Ethernet1/11
  switchport monitor
  switchport access vlan 2
  no shutdown

interface Ethernet1/21
  switchport monitor
  switchport access vlan 2
  no shutdown

If I shutdown monitor session 1, the data comes out monitor session 2.

If I shutdown eth1/10, no data comes out.

All interfaces show "connected".

How do I get data out of eth1/11 and eth1/21 simultaneously?

[crackedHead]

This is not a helpful reply but after an unplanned reboot of the switch, it is now working as expected. Smells like a bug in NX-OS...

But this is not permanent. After running for a while, the throughput of one monitor session has dropped to about 20% of the other session when both should be almost equal.

[ds-sl]

Hi @crackedHead , had you figured out the solution to this issue?

We also have 2 monitoring sessions configured and after some time (typically a day or two) we see that one of the monitor session stops working/mirroring. Doing a "shut/no shut" cycle on this session again gets things to a working state.