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Cisco Bug: CSCvr25786 - Intel X710 adapter doesn't send LLDP Data Units to the network stack.

Last Modified

Apr 13, 2020

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

4.0(4c)S7

Description (partial)

Symptom:
Intel X710 doesn't send LLDP DU's to Nexus 5k switch. This causes the switch to shut down its port connecting to the Intel X710 adapter.

Nexus switch package Controls Sub-TLV in LLDP frame with a SeqNo of 1 and an AckNo of 2 & send it to the connected host.
The host is supposed to inverse this, and send an LLDP frame with a Control Sub-TLV with a SeqNo of 2 and an AckNo of 1.
The switch expects this exchange from the host every 30 seconds. If the switch does not see this exchange for 100 Protocol Data Units (PDUs) , which is 3000 seconds or 50 minutes, the switch disables the port.

Conditions:
As per Intel LACP config guide, The LLDP Engine is responsible for receiving and consuming LLDP frames, and also replies to the LLDP frames that it receives. The LLDP engine does not forward LLDP frames to the network stack of the Operating System.
LACP may not function correctly in certain environments that require LLDP frames containing LCAP information to be forwarded to the network stack. To avoid this situation, the user must disable the IntelĀ® Ethernet 700 Series Network Adapter's hardware LLDP engine.

As per default the Adapter's HW LLDP is ON which 
Adapter firmware-version: 6.01 0x800036bd 0.385.33
Driver version: 2.8.10-k
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