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  • 1.  vlan interface down

    Posted 03-26-2010 09:07

    I have a strange one:


    # show vlans
    vrrp-vlan {
        vlan-id 100;
        l3-interface vlan.0;

    # show interfaces

    ge-1/0/4 {
        mtu 9192;
        unit 0 {
            family ethernet-switching {
                port-mode access;
                vlan {
                    members vrrp-vlan;
    ge-1/0/5 {
        mtu 9192;
        unit 0 {
            family ethernet-switching {
                port-mode trunk;
                vlan {
                    members vrrp-vlan;

    vlan {              
        unit 0 {
            family inet {
                rpf-check fail-filter rpf-inet;
                address {
                    vrrp-group 1 {
                        priority 90;



    yet when i do a show interface vlan:

    VLAN: vrrp-vlan, Created at: Fri Mar 26 22:55:45 2010
    802.1Q Tag: 100, Internal index: 3, Admin State: Enabled, Origin: Static
    Protocol: Port Mode, Mac aging time: 300 seconds
    Number of interfaces: Tagged 1 (Active = 1), Untagged  1 (Active = 0)
          ge-1/0/5.0*, tagged, trunk
          ge-1/0/4.0, untagged, access

    # run show interfaces vlan.0
      Logical interface vlan.0 (Index 69) (SNMP ifIndex 502)
        Flags: Link-Layer-Down SNMP-Traps 0x4000 Encapsulation: ENET2
        Bandwidth: 0
        Input packets : 0
        Output packets: 1
        Security: Zone: Null
        Protocol inet, MTU: 1500
          Flags: uRPF
          Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
            Destination: 1.1.1/24, Local:,


    it seems that if I have no active access ports in the vlan the vlan interface goes down!!!


    how can I force it up?



  • 2.  RE: vlan interface down

    Posted 03-26-2010 14:10



    You're right


    Your vlan interface will be up when at least one interface in the vlan will be up.

    I don't know any way to put it in loopback mode (as it exists on Extreme switches for example)


    If you ony need an address for test  or for management just use a loopback interface (lo0.x)


    If anyone knows if it's possible please tell us !


    Hope This will Help You

  • 3.  RE: vlan interface down

    Posted 05-20-2010 08:58

    Hi, did you manage to solve this issue?

    We are trying to do it but haven't managed yet to do so.