vPC topologies

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Its stated that in vPC topologies, 

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Note



Always attach all vPC devices using EtherChannels to both vPC peer devices.



Would the connections to the FEX in the attached diagram be orphan ports? 

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Comments

  • Perhaps, in an attempt to answer my own question, the FEXs are considered as line cards, so logically, the server/downstream device is paired to two parent switches in what could be an active/standby configuration? 

  • Consider N2K as a line card to Nexus5/7K. This is logially similar to a typical vpc topology, nothing really different. 

  • In this scenario, the FEX connections are not orphan ports because they do not participate in a vPC. The FEX connections are normal port-channels, that is:

    N5K1:

    feature fex

    feature lacp

    interface Eth1/1-2

     channel-group 100 mode active

     

    interface Po100

     switchport mode fex-fabric

     fex associate 100

     

    N5K2:

    feature fex

    feature lacp

    interface Eth1/1-2

     channel-group 101 mode active

     

    interface Po101

     switchport mode fex-fabric

     fex associate 101

     

     

    Note that neither of these confguraions have the command "vpc 100" or "vpc 101"

     

    However, the host would be configured for either static or lacp aggregation and the N5Ks would be configured as followed (with vPC commands):

    N5K1:

    int Eth100/1/2

     description Server

     channel-group 10 mode active

     

    int Po10

     switchport access vlan 50

     vpc 10

     

    N5K1:

    int Eth101/1/2

     description Server

     channel-group 10 mode active

     

    int Po10

     switchport access vlan 50

     vpc 10

  • thanks for the detailed explanation. I understand now 

    On 6 June 2015 at 19:32, ajCCIE2b <[email protected]> wrote:

    In this scenario, the FEX connections are not orphan ports because they do not participate in a vPC. The FEX connections are normal port-channels, that is:

    N5K1:

    feature fex

    feature lacp

    interface Eth1/1-2

     switchport mode fex-fabric

     fex associate 101

     channel-group 101 mode active

     

    interface Po101

     switchport mode fex-fabric

     fex associate 101

     

    N5K2:

    feature fex

    feature lacp

    interface Eth1/1-2

     switchport mode fex-fabric

     fex associate 102

     channel-group 102 mode active

     

    interface Po102

     switchport mode fex-fabric

     fex associate 102

     

     

    Note that neither of these confguraions have the command "vpc 101" or "vpc 102"

     

    However, the host would be configured for either static or lacp aggregation and the N5Ks would be configured as followed (with vPC commands):

    N5K1:

    int Eth101/1/1

     description Server

     channel-group 10 mode active

     

    int Po10

     switchport access vlan 50

     vpc 10

     

    N5K1:

    int Eth102/1/1

     description Server

     channel-group 10 mode active

     

    int Po10

     switchport access vlan 50

     vpc 10



    --
    View this message online at: http://ieoc.com/forums/p/32602/256508.aspx#256508

    Mbong Hudson,
    C.T.O VMBG Music,
    Work Email: [email protected]

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