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Ask questions and share experiences about EX and QFX portfolios and all switching solutions across your data center, campus, and branch locations.
  • 1.  LLDP. What would keep a core switch from seeing an edge switch with LLDP?

    Posted 29 days ago

    I have a few locations at our schools where the core switch doesn't "see" the edge switch, but they work just fine. I noticed this first in the Mist dashboard. The edge switch didn't show what the uplink port was connected to. In the CLI, the edge switch sees the core switch, but the core does not see the edge switch.  I have about 4 sites that have one switch hanging out on it's own in the topology view and the LLDP issue looks to be the cause. 



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    JOHN WILLIAMSON
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  • 2.  RE: LLDP. What would keep a core switch from seeing an edge switch with LLDP?

    Posted 27 days ago

    I would start by confirming the lldp status on the affected switches

    show lldp neighbors

    And if the neighbors are indeed not up and running, confirm that both the interfaces and the lldp protocol sections are complete on the both adjacent switches per this documentation.

    https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic-map/device-discovery-using-lldp-lldp-med.html



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    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
    http://puluka.com/home
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  • 3.  RE: LLDP. What would keep a core switch from seeing an edge switch with LLDP?

    Posted 24 days ago

    All of our switches have the following setting by using switch templates:

    set protocols lldp port-id-subtype interface-name
    set protocols lldp port-description-type interface-alias
    set protocols lldp interface all
    set protocols lldp-med interface all

    I have confirmed that the core switch and edge switch both still have that configuration. 



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    JOHN WILLIAMSON
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  • 4.  RE: LLDP. What would keep a core switch from seeing an edge switch with LLDP?

    Posted 24 days ago

    I've revisited all the switches that are not shown properly in the Mist "Topology" view, this morning. All of them do see their neighbors.  They just have incorrect layouts in the Topology view.   All my sites should have the MDF as the top of the tree, but I have some sites that have a switch at the same level or in one case a Dell computer. 

    I'll start a new topic for the issue. 

     



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    JOHN WILLIAMSON
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  • 5.  RE: LLDP. What would keep a core switch from seeing an edge switch with LLDP?

    Posted 22 days ago

    If the neighbors are correctly shown via the command line on both sides, not just one.

    show lldp neighbors

    Then then the configurations will be correct.  So the issue will be with the Mist portal software not correctly importing the discovered configuration.  You likely will need to open a support ticket there.



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    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
    http://puluka.com/home
    ------------------------------