NAM2 monitors Tx, but not Rx, on Span ports

[GlanvilleP]

NAM2 with 3.3(1) & Patch 1 (maintenance 2.1(1)) in a 6500 13 slot (IOS 12.1(19)E1a.)

Recently installed. On a SPAN port (to a device, or Trunk to another switch) it monitors Tx, but says there is no RX traffic. On an Etherchannel, it monitors both directions.

Any suggestions/ideas?

(it was doing this with NAM2 v3.1, so I upgraded it to 3.3)

[rmushtaq]

Have you spanned the source in both directions?. Does this happen for every span source?

[GlanvilleP]

Tried it with Both directions onto one NAM interface. Traffic looked wrong. Tried TX onto one NAM interface & RX to the other. Traffic only registered on TX.

Tried reversing Tx and RX to opposite NAM interfaces. No difference.

Tried a couple of different source ports with devices (therefore only belong to one VLAN). Same thing.

Tried a Trunk Port (all VLANs, to another switch). Same thing.

Tried a Etherchannel (6 ports bonded, to another 6513. All VLANs). Traffic registered for both TX and RX.

It SEEMS to be the SPAN that does not work, rather than the NAM.

[rmushtaq]

Then this is not a problem with the NAM itself.