I'm super new to Nexus, so I'm not really sure how to troubleshoot this. I did a quick search and found that this is related to DCBX TLVs in LLDP, which we apparently shouldn't be getting on a regular ethernet port. I'm pretty sure this is just a regular ethernet port. (Like I said, I'm pretty new to nexus. lol) I wonder if the following output indicates that we are receiving and sending DCBX TLVs in LLDP. If so, it sounds like the interface will go into err-disable state if the server stops sending ACK frames.
# show lldp dcbx int e1/17
Local DCBXP Control information:
Operation version: 00 Max version: 00 Seq no: 1 Ack no: 1
Type/
Subtype Version En/Will/Adv Config
004/000 000 Y/N/Y 8906001b21 08
002/000 000 Y/N/Y 0000000064 00000000 00000001
Peer's DCBXP Control information:
Operation version: 00 Max version: 00 Seq no: 1 Ack no: 1
Type/ Max/Oper
Subtype Version En/Will/Err Config
004/000 000/000 Y/Y/N 8906001b21 08
003/000 000/000 Y/Y/Y ff08
002/000 000/000 Y/Y/N ffffffff00 00000000 00000008
This is the first time we've run into this. Any idea what might really be going on?
Thanks!
Solved! Go to Solution.
Hi,
Please investigate/verify the Server CNA, i.e. drivers, Compatibility with Server OS version.
If this is recurring, as a temporary workaround you can disable LLDP on interface that connects to Server.
no lldp transmit
no lldp receive
Hi,
Please investigate/verify the Server CNA, i.e. drivers, Compatibility with Server OS version.
If this is recurring, as a temporary workaround you can disable LLDP on interface that connects to Server.
no lldp transmit
no lldp receive
Isn't a CNA for FC or FCoE? Can they do regular Ethernet, too? I thought that a CNA was only for FC or FCoE. I verified that we're not doing FC or FCoE on these Nexus switches. I'll have the server owners check into it.
Thanks!
Hi,
Per the display it the Server Adapter is doing LLDP DCBX negotiation.
If not needed, then you might want to check the Server adapter settings.
DCBX is an extension of LLDP link layer discovery protocol; not restricted for FCOE usage.
Further informatin on LLDP for Nexus:
Thanks!
Regards,
Carlos
Thanks! That's very helpful information. I'll have the server owners check into that setting. I suspect we'll probably just disable LLDP since we don't really need it on any of these interfaces.
I appreciate the help!