Disable LLDP on FEX interface

[aukhadiev]

HI, have 2 Nexus 5k (NX-OS version 5.2(1)N1(3)) in vPC domain and several dual-homed FEX (switch-profile, conf sync)...
LLDP is enable globally by feature lldp, tried to disable lldp on fex interface, but there is no command under conf sync mode to do it:

NX5548-1# conf sync
Enter configuration commands, one per line. End with CNTL/Z.
NX5548-1(config-sync)# switch-profile card
Switch-Profile started, Profile ID is 1
NX5548-1(config-sync-sp)# interface e101/1/1
NX5548-1(config-sync-sp-if)# no l?
lacp Configure LACP parameters
link Configure link
load-interval Specify interval for load calculation for an interface
NX5548-1(config-sync-sp-if)# 

So there's no way to disable LLDP on FEX interface?
Feature lldp is enable by default on Nexus 5K, if there's NO ANY IMPACT to disable it globally by no feature lldp ?

[omz]

You cannot disable LLDP on FEX switch it will have to disabled on the mother switch. 

You only need LLDP if you are using FCoE for storage. LLDP is needed for DCBX communication.

[aukhadiev]

> You cannot disable LLDP on FEX switch it will have to disabled on the mother switch...
I do not quite understand you, I'm trying to disable LLDP on FEX interfaces on the parent switch, cause LLDP run on FEX interface:
___________________________________________________________
NX5548-1# sh lldp interface ethernet 101/1/1
Interface Information:
Enable (tx/rx/dcbx): Y/Y/Y Port Mac address: f0:78:16:eb:54:a2
___________________________________________________________
NX5548-1# conf sync
Enter configuration commands, one per line. End with CNTL/Z.
NX5548-1(config-sync)# switch-profile card
Switch-Profile started, Profile ID is 1
NX5548-1(config-sync-sp)# interface e101/1/1
NX5548-1(config-sync-sp-if)# no l?
lacp Configure LACP parameters
link Configure link
load-interval Specify interval for load calculation for an interface
NX5548-1(config-sync-sp-if)#
___________________________________________________________

[omz]

AFAIK .. you cannot disable on a single FEX port. You disable on the port of the parent switch where FEX is connected. AND that will disable for the whole FEX. 

"All LLDP configuration on Fabric Extender ports occurs on the supervisor. LLDP configuration and show commands are not visible on the Fabric Extender console."

Configuring LLDP

[aukhadiev]

Just talking with TAC, they said that:
"The lldp commands are not switch-profile aware and won’t be able to configure them using "config sync". So you need to do configure via "conf t."

[omz]

Is LLDP disabled on an individual FEX port?

[aukhadiev]

Hi, logically yes, did not check  on practice (I will do it Monday)...

Cause there is no lldp commands under switch-profile (conf sync) you should define port-profile with disable LLDP via "conf t" on both parent switch, then apply this port-profile to FEX interfaces via "conf sync".

[omz]

Hi 

Thanks for the reply.

port-profile .. ah makes sense. Please do let us know how it worked. 

[aukhadiev]

Hi, just do it, worked as expected...

NX5548-1# sh run int e101/1/1
!Command: show running-config interface Ethernet101/1/1
!Time: Mon Jun 17 09:22:15 2019
version 5.2(1)N1(3)
interface Ethernet101/1/1
  inherit port-profile NoLLDP
  description pcterm 1
  no cdp enable
  spanning-tree bpdufilter disable
NX5548-1# sh run int e101/1/1 expand-port-profile
!Command: show running-config interface Ethernet101/1/1 expand-port-profile
!Time: Mon Jun 17 09:22:21 2019
version 5.2(1)N1(3)
interface Ethernet101/1/1
  description pcterm 1
  no lldp transmit
  no lldp receive
  no cdp enable
  spanning-tree bpdufilter disable
NX5548-1# sh lldp interface e101/1/1
Interface Information:
  Enable (tx/rx/dcbx): N/N/N    Port Mac address: f0:78:16:eb:54:a2
NX5548-1#

[omz]

Thanks a lot for sharing. Really appreciate it.

Learned something :)