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  • 1.  Fully Meshed MC-LAG not working

    Posted 03-22-2021 05:00
    Hello,

    Given the setup:


    Upon configuring VLAN "145" on a the trunks between the switches (a<->b, a<->c, a<->d and b<->a, b<->c, b<->d , FW <-> a/b, VC <-> c/d)
    The ae3 and ae4 interface will go down on the b switch and the server connected to the VC (Virtual Chassis) will not be reachable. 
    ICCP for both sessions is configured between  a<->b using ae0 interface.

    If there are no vlans configured on the interfaces all the MC-LAG involved interfaces will stay up.

    Configuration on a:

    set interfaces ae3 mtu 9192
    set interfaces ae3 aggregated-ether-options lacp active
    set interfaces ae3 aggregated-ether-options lacp periodic fast
    set interfaces ae3 aggregated-ether-options lacp system-id 00:01:02:03:03:03
    set interfaces ae3 aggregated-ether-options lacp admin-key 3003
    set interfaces ae3 aggregated-ether-options mc-ae mc-ae-id 3003
    set interfaces ae3 aggregated-ether-options mc-ae chassis-id 1
    set interfaces ae3 aggregated-ether-options mc-ae mode active-active
    set interfaces ae3 aggregated-ether-options mc-ae status-control standby
    set interfaces ae3 aggregated-ether-options mc-ae init-delay-time 240
    set interfaces ae3 unit 0 family ethernet-switching interface-mode trunk
    set interfaces ae3 unit 0 family ethernet-switching vlan members 145
    set interfaces ae4 mtu 9192
    set interfaces ae4 aggregated-ether-options lacp active
    set interfaces ae4 aggregated-ether-options lacp periodic fast
    set interfaces ae4 aggregated-ether-options lacp system-id 00:01:02:03:03:04
    set interfaces ae4 aggregated-ether-options lacp admin-key 3004
    set interfaces ae4 aggregated-ether-options mc-ae mc-ae-id 3004
    set interfaces ae4 aggregated-ether-options mc-ae chassis-id 1
    set interfaces ae4 aggregated-ether-options mc-ae mode active-active
    set interfaces ae4 aggregated-ether-options mc-ae status-control standby
    set interfaces ae4 aggregated-ether-options mc-ae init-delay-time 240
    set interfaces ae4 unit 0 family ethernet-switching interface-mode trunk
    set interfaces ae4 unit 0 family ethernet-switching vlan members 145

    b:
    set interfaces ae3 mtu 9192
    set interfaces ae3 aggregated-ether-options lacp active
    set interfaces ae3 aggregated-ether-options lacp periodic fast
    set interfaces ae3 aggregated-ether-options lacp system-id 00:01:02:03:03:03
    set interfaces ae3 aggregated-ether-options lacp admin-key 3003
    set interfaces ae3 aggregated-ether-options mc-ae mc-ae-id 3003
    set interfaces ae3 aggregated-ether-options mc-ae chassis-id 0
    set interfaces ae3 aggregated-ether-options mc-ae mode active-active
    set interfaces ae3 aggregated-ether-options mc-ae status-control active
    set interfaces ae3 aggregated-ether-options mc-ae init-delay-time 240
    set interfaces ae3 unit 0 family ethernet-switching interface-mode trunk
    set interfaces ae3 unit 0 family ethernet-switching vlan members 145

    set interfaces ae4 mtu 9192
    set interfaces ae4 aggregated-ether-options lacp active
    set interfaces ae4 aggregated-ether-options lacp periodic fast
    set interfaces ae4 aggregated-ether-options lacp system-id 00:01:02:03:03:04
    set interfaces ae4 aggregated-ether-options lacp admin-key 3004
    set interfaces ae4 aggregated-ether-options mc-ae mc-ae-id 3004
    set interfaces ae4 aggregated-ether-options mc-ae chassis-id 0
    set interfaces ae4 aggregated-ether-options mc-ae mode active-active
    set interfaces ae4 aggregated-ether-options mc-ae status-control active
    set interfaces ae4 aggregated-ether-options mc-ae init-delay-time 240
    set interfaces ae4 unit 0 family ethernet-switching interface-mode trunk
    set interfaces ae4 unit 0 family ethernet-switching vlan members 145

    c:
    set interfaces ae3 mtu 9192
    set interfaces ae3 aggregated-ether-options lacp active
    set interfaces ae3 aggregated-ether-options lacp periodic fast
    set interfaces ae3 unit 0 family ethernet-switching interface-mode trunk
    set interfaces ae3 unit 0 family ethernet-switching vlan members 145

    d:
    set interfaces ae4 mtu 9192
    set interfaces ae4 aggregated-ether-options lacp active
    set interfaces ae4 aggregated-ether-options lacp periodic fast
    set interfaces ae4 unit 0 family ethernet-switching interface-mode trunk
    set interfaces ae4 unit 0 family ethernet-switching vlan members 145

    VC:
    set interfaces ae0 aggregated-ether-options lacp active
    set interfaces ae0 aggregated-ether-options lacp periodic fast
    set interfaces ae0 unit 0 family ethernet-switching interface-mode trunk
    set interfaces ae0 unit 0 family ethernet-switching vlan members 145
    set interfaces ae1 mtu 9192
    set interfaces ae1 aggregated-ether-options lacp active
    set interfaces ae1 aggregated-ether-options lacp periodic fast
    set interfaces ae1 unit 0 family ethernet-switching interface-mode trunk
    set interfaces ae1 unit 0 family ethernet-switching vlan members 145

    Interfaces towards FW have configured vlan all on both interfaces from a and b

    Tried configuring RSTP, VSTP with no luck.
    To make this setup working traffic is routed on the upper side: FW <-> a <-> c <-> VC
    Given the desired setup the configuration should work without problems.

    ------------------------------
    ALEXANDRU MINZAT
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  • 2.  RE: Fully Meshed MC-LAG not working

    Posted 03-28-2021 06:23
    Since you are creating a full mesh layer 2 on the same vlan you correctly note you need loop prevention with STP setup in some fashion.

    Did you confirm the full mesh "not working" is a layer 2 loop?
    What are the symptoms of "not working"?

    If this is a loop problem then we need to dig into the specifics of the STP solution you want to implement and will need those details.

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