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LAG between EX2300 and cisco VSS not coming up

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  • 1.  LAG between EX2300 and cisco VSS not coming up

    Posted 01-22-2019 08:53
      |   view attached

    Hi all,

     

    i am not sure if what am trying achieve is possible, i need some  guidance.

    We have 3 ex2300 switches in 3 sites , the switches are runnign RSTP.

     

    on every site there are 2 Cisco switches forming VSS. from these two cisco switches there are two links connecting to the EX2300 and every VSS is requred to form LAG with the EX2300. 

    we have set up the LAG but the AE interface is not coming up. checking the LACT statistics, i can only TX packets and no RX. 

    we have tried with and wothout LACP. when LACP is enabled, we tried both ACTIVE/ACTIVE and active/passive  but still AE inteface remains down on the juniper. the port channle interface on the cisco shows up. 

     

    configs as below:

    # show chassis
    aggregated-devices {
        ethernet {
            device-count 2;
        }
    }
    
    # show interfaces ae0
    aggregated-ether-options {
        lacp {
            active;
        }
    }
    unit 0 {
      family ethernet-switching {
            interface-mode trunk;
             vlan-members all;
        }
    set interfaces xe-0/1/2 ether-options 802.3ad ae0
    set interfaces xe-0/1/3 ether-options 802.3ad ae0
    
    set protocols rstp interface ae0.0
    
    

     

    Regards

    Lish

     

     

    Attachment(s)

    pdf
    LAG setup.pdf   19K 1 version


  • 2.  RE: LAG between EX2300 and cisco VSS not coming up

     
    Posted 01-22-2019 09:34

    Are your 10Gb ports configured as virtual chassis uplinks?

     

    show virtual-chassis vc-port


  • 3.  RE: LAG between EX2300 and cisco VSS not coming up

    Posted 01-22-2019 09:52

    Hi Smicker,

     

    No. no visrtual setup as of now. is it something i should do ?

     

     



  • 4.  RE: LAG between EX2300 and cisco VSS not coming up

     
    Posted 01-22-2019 09:56

    No, but it would prevent the LAG from forming if they were. I don't know if those ports are configured by default for VC as some are on other models. Do you get physical link on xe-0/1/2 and xe-0/1/3?



  • 5.  RE: LAG between EX2300 and cisco VSS not coming up

    Posted 01-22-2019 10:01

    Hi Smicker,

     

    Both physical ports are coming up. these two ports were used as typical L2 trunk ports and were tested to pass traffic. 



  • 6.  RE: LAG between EX2300 and cisco VSS not coming up

     
    Posted 01-22-2019 10:31

    'show interfaces ae0 extensive' and 'show lacp interfaces ae0' will give some additional detailed info on any negotiated LACP settings.



  • 7.  RE: LAG between EX2300 and cisco VSS not coming up

     
    Posted 01-22-2019 11:52

    Hi Lish,

    Can you show us the "show lacp interfaces" on the EX? Are the links on the VSS configured as L2 or L3? Have you tried configuring LACP as Juniper Active, Cisco Passive? and viceversa? What is the periodic interval configured on the Cisco?



  • 8.  RE: LAG between EX2300 and cisco VSS not coming up
    Best Answer

    Posted 03-04-2019 10:28
    Hi, I felt I should update this.
    The lag eventually came up after enabling bpdu-filter on the Cisco ports.

    STP was shutting down the ports on the Cisco end.

    Thanks .