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  • 1.  LLDP not working when interface has ONLY interface description configured

    Posted 09-01-2023 09:06
    Tested with:
    Model: qfx5100-24q-2p
    Junos: 20.2R3-S2.5
    If the interface has no configuration (default state), and I only add interface description:
    root@juniper-virtual-chassis-QFX5100# show | display set | match 0/0/23:1
    set interfaces xe-0/0/23:1 description test
     
    LLDP is not working 
    {master:0}[edit]
    root@juniper-virtual-chassis-QFX5100# run show lldp neighbors interface xe-0/0/23:1
    I did also packet captures, and apparently switch does not send LLDP. Also, it does not process received LLDP.
    After I delete the interface description, LLDP works normally.
    This behaviour does not seem correct, looks like a bug
     


    ------------------------------
    Andrei Tomus
    ------------------------------


  • 2.  RE: LLDP not working when interface has ONLY interface description configured

    Posted 09-01-2023 13:39

    I enabled LLDP logging on that interface:

    Sep  1 16:35:58.208503 intf Inside lldp_handle_ifl_event for ge-0/0/2.16386 ifl event 4
    Sep  1 16:35:58.208516 intf Inside lldp_handle_ifl_delete for ge-0/0/2.16386 ifl delete
    Sep  1 16:35:58.208522 config ifl (ge-0/0/2.16386) proto: 1
    Sep  1 16:35:58.208528 config Disabling ge-0/0/2.16386 fsm on ifl(lldp) for proto 1
    Sep  1 16:35:58.208531 config DCBX delete interface: ge-0/0/2.16386
    Sep  1 16:35:58.208535 config Proto 1 LLDP, no deletion of PPM state when LLDP-MED configuration is present
    Sep  1 16:35:58.208538 config ifl (ge-0/0/2.16386) proto: 4
    Sep  1 16:35:58.208542 config Disabling ge-0/0/2.16386 fsm on ifl(lldp) for proto 4
    Sep  1 16:35:58.208549 config Proto 4, no deletion of PPM state when LLDPconfiguration is present
    Sep  1 16:35:58.208553 rtsock Delete context 1 for ifl ge-0/0/2.16386
    Sep  1 16:35:58.208557 intf Inside lldp_handle_ifd_delete, Send request to detach LLDP filters for intf ge-0/0/2
    Sep  1 16:35:58.209367 proto Delete rdb . cleaning up dcbx sm
    Sep  1 16:35:58.209397 proto tlv event is 2
    Sep  1 16:35:58.209419 proto lldp_delete_rdb: The deleted rdb record's ifl =ge-0/0/2.16386,msap_id=\x04\x0w'\x14▒
    Sep  1 16:35:58.209923 proto TTL expiry for RDB neighbor count on ifl(ge-0/0/2.16386) = 0
    Sep  1 16:35:58.209934 rtsock deleting ifl ge-0/0/2.16386 iflidx 343
    Sep  1 16:35:58.209938 config Deleting ifl ge-0/0/2.16386
    Sep  1 16:35:58.209951 proto Deleted all vmembers from ifl ge-0/0/2.16386
    Sep  1 16:35:58.209957 jvision lldp_telemetry_handle_intf_change: interface ge-0/0/2 delete event

    Those delete operations seem strange for a simple fact like adding a description on the interface



    ------------------------------
    Andrei Tomus
    ------------------------------



  • 3.  RE: LLDP not working when interface has ONLY interface description configured

    Posted 09-01-2023 15:20

    What does this show before and after adding the interface description?

    show configuration | display inheritance | display set | match xe-0/0/23:1



    ------------------------------
    Chuck Anderson
    ------------------------------



  • 4.  RE: LLDP not working when interface has ONLY interface description configured

    Posted 09-01-2023 18:57
    When no interface description is set, output is empty
     
    root@juniper-virtual-chassis-QFX5100> show configuration | display inheritance | display set | match xe-0/0/23:1
     
    {master:0}
     
    LLDP works
     
     
     
    When interface description is set 
     
    root@juniper-virtual-chassis-QFX5100> show configuration | display inheritance | display set | match xe-0/0/23:1
    set interfaces xe-0/0/23:1 description test
     
    {master:0}
     
     
    LLDP no longer works
     
    root@juniper-virtual-chassis-QFX5100> show lldp neighbors interface xe-0/0/23:1
     
    {master:0}


    ------------------------------
    Andrei Tomus
    ------------------------------



  • 5.  RE: LLDP not working when interface has ONLY interface description configured

    Posted 09-03-2023 03:13
    One additional thing I noticed, after interface description is assigned, the interface is removed from LLDP local information output.
     
    Steps to reproduce:
     
    1. I deleted previous interface description on interface. LLDP works and interface appears in LLDP local information
     
     
    root@juniper-virtual-chassis-QFX5100# show | display set | match 0/0/23:1
     
    {master:0}[edit]
     
     
    Interface is visible in the lldp local info:
     
    root@juniper-virtual-chassis-QFX5100# run show lldp local-information | match 0/0/23:1
    xe-0/0/23:1         -                  519                test999                  Up               << previous description that was deleted. Description is advertised in LLDP an visible on the remote device
     
    {master:0}[edit]
     
     
     
    2. I add a new description to the interface 
     
     
    root@juniper-virtual-chassis-QFX5100# set interfaces xe-0/0/23:1 description new_test888
     
    {master:0}[edit]
    root@juniper-virtual-chassis-QFX5100# commit
    fpc0:
    configuration check succeeds
    fpc1:
    commit complete
    fpc0:
    commit complete
     
     
    Interface dissappears from lldp local-information 
     
    {master:0}[edit]
    root@juniper-virtual-chassis-QFX5100# run show lldp local-information | match 0/0/23:1
     
    {master:0}[edit]
     
     
    LLDP is no longer working: 
     
    root@juniper-virtual-chassis-QFX5100# run show lldp neighbors interface xe-0/0/23:1
     
    {master:0}[edit]
     
     
     
    even if LLDP is activated on all interfaces:
     
     
    run show lldp detail
     
    LLDP                      : Enabled
    Advertisement interval    : 30 seconds
    Transmit delay            : 2 seconds
    Hold timer                : 120 seconds
    Notification interval     : 5 Second(s)
    Config Trap Interval      : 0 seconds
    Connection Hold timer     : 300 seconds
     
    LLDP MED                  : Enabled
    MED fast start count      : 3 Packets
     
    Port ID TLV subtype       : interface-name
    Port Description TLV type : interface-alias (ifAlias)
     
    Interface      Parent Interface    LLDP        LLDP-MED     Power Negotiation     Neighbor count
    all            -                   Enabled     Enabled      Enabled               7                  <<<<
     
     
    I try to activate LLDP on that specific interface also:
     
     
    root@juniper-virtual-chassis-QFX5100# set protocols lldp interface xe-0/0/23:1
     
    {master:0}[edit]
    root@juniper-virtual-chassis-QFX5100# commit
    fpc0:
    configuration check succeeds
    fpc1:
    commit complete
    fpc0:
    commit complete
     
    {master:0}[edit]
    root@juniper-virtual-chassis-QFX5100# run show lldp detail
     
    LLDP                      : Enabled
    Advertisement interval    : 30 seconds
    Transmit delay            : 2 seconds
    Hold timer                : 120 seconds
    Notification interval     : 5 Second(s)
    Config Trap Interval      : 0 seconds
    Connection Hold timer     : 300 seconds
     
    LLDP MED                  : Enabled
    MED fast start count      : 3 Packets
     
    Port ID TLV subtype       : interface-name
    Port Description TLV type : interface-alias (ifAlias)
     
    Interface      Parent Interface    LLDP        LLDP-MED     Power Negotiation     Neighbor count
    all            -                   Enabled     Enabled      Enabled               7               <<<  no update here
     
     
     
    3. I delete interface description 
     
    root@juniper-virtual-chassis-QFX5100# delete interfaces xe-0/0/23:1 description
     
    {master:0}[edit]
    root@juniper-virtual-chassis-QFX5100# commit
    fpc0:
    configuration check succeeds
    fpc1:
    commit complete
    fpc0:
    commit complete
     
    {master:0}[edit]
     
     
    root@juniper-virtual-chassis-QFX5100# run show lldp local-information | match 0/0/23:1 
    xe-0/0/23:1         -                  519                new_test888              Up         <<<
     
     
     
     
    root@juniper-virtual-chassis-QFX5100# run show lldp detail
     
    LLDP                      : Enabled
    Advertisement interval    : 30 seconds
    Transmit delay            : 2 seconds
    Hold timer                : 120 seconds
    Notification interval     : 5 Second(s)
    Config Trap Interval      : 0 seconds
    Connection Hold timer     : 300 seconds
     
    LLDP MED                  : Enabled
    MED fast start count      : 3 Packets
     
    Port ID TLV subtype       : interface-name
    Port Description TLV type : interface-alias (ifAlias)
     
    Interface      Parent Interface    LLDP        LLDP-MED     Power Negotiation     Neighbor count
    all            -                   Enabled     Enabled      Enabled               8
    xe-0/0/23:1    -                   Enabled     -            Enabled               1          <<<
     


    ------------------------------
    Andrei Tomus
    ------------------------------