ESXi

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  • 1.  Host Flapping on Vlan between vSwitch and Physical Switch

    Posted Jul 27, 2009 09:21 PM

    Here's the situation:

    Esxi 4 installed on server with two NIC's. One NIC used to manage ESX. It has its own vSwich and port group. NIC 2 on server is assigend its own vSwitch. XP is intalled as guest VM using Intel Pro/drivers to tag vlans. 4 NIC's created on the XP vm each having IP and respective vlan tag. Port group allows all vlans to the XP vm. Physical NIC from server plugs into fa0/20 on Cisco 2960 with the following config:

    interface FastEthernet0/20

    description ESX Trunk

    switchport trunk allowed vlan 1-99,101-4094

    switchport mode trunk

    A second physical server running linux is connected to fa0/5. Every so often I see the this error on the Cisco switch: <![endif]><![if gte mso 9]>"Jul 27 17:06:12.479: %SW_MATM-4-MACFLAP_NOTIF:

    Host 0018.8b3f.c59a in vlan 104 is flapping between port Fa0/20 and port Fa0/5"

    Why am I seeing a host flap when these are clearly two different machines? Is there something weird happening between the vswitch and Cisco switch?

    Thanks...



  • 2.  RE: Host Flapping on Vlan between vSwitch and Physical Switch

    Posted Jul 27, 2009 09:23 PM

    Here's the situation:

    Esxi 4 installed on server with two NIC's. One NIC used to manage ESX.

    It has its own vSwich and port group. NIC 2 on server is assigend its

    own vSwitch. XP is intalled as guest VM using Intel Pro/drivers to tag

    vlans. 4 NIC's created on the XP vm each having IP and respective vlan

    tag. Port group allows all vlans to the XP vm. Physical NIC from server

    plugs into fa0/20 on Cisco 2960 with the following config:

    interface FastEthernet0/20

    description ESX Trunk

    switchport trunk allowed vlan 1-99,101-4094

    switchport mode trunk

    A second physical server running linux is connected to fa0/5.

    Every so often I see the this error on the Cisco switch: Host 0018.8b3f.c59a in vlan 104 is flapping between port Fa0/20 and port Fa0/5"

    Why am I seeing a host flap when these are clearly two

    different machines? Is there something weird happening between the

    vswitch and Cisco switch?

    Thanks...