Symptom
Nexus 5600 will drop packets with the DEI bit set to 1 in the dot1q header.
Conditions
DEI bit is set to 1 in the dot1q header
Further Problem Description
+ dot1q header DEI bit is being set by N9K due to an ACI feature and is indicated by the CE_Q0_DE field. We see the following field set when we drop the packet:
ELAM capture
| VNIC_VLD | 0 |
| CE_1Q_NUM | 1 |
| CE_Q0_VLAN | 4 |
| CE_Q0_COS | 7 |
| CE_Q0_DE | 1 | << DEI bit set
** Output cut **
| EXT_VLAN | 4 |
| EXT_COS | 7 |
| OUT_DISCARD | 1 |
| OUT_DROP | 1 | << Packet dropped
Fix-Remarks
To resolve this bug upgrade to the release with the fix by reload method and not ISSU.
If ISSU method is followed a reload of the switch is required for the fix to become effective.
