Layer 3 Port-channel between VPC pair

zubair.syedzubair.syed
in CCIE Data Center Technical

Hi Guys,

 

I would like to connect two VPC pair (Nexus 5672) using Layer 3 port-channel, can you please tell me what would be the configuration like?

 

Thanks, 

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Comments

  • ajCCIE2bajCCIE2b

    Can you clarify what you are trying to do? If you want to connect two Nexus 5600s that happen to be vPC peers with a separate port-channel for L3 routing, then the configuration will have nothing to do with vPC. It would look something like this:

     

    N5672-1:

    int po2

     no switchport

     ip address 10.0.0.0/31

     no shutdown

     

    int eth1/3-4

     no switchport

     channel-group 2 mode active

     no shutdown

     

    N5672-2:

    int po2

     no switchport

     ip address 10.0.0.1/31

     no shutdown

     

    int eth1/3-4

     no switchport

     channel-group 2 mode active

     no shutdown

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  • Sukhjit.HayreSukhjit.Hayre


    vPC supports only L2 ether channels not L3



    On 28 May 2015, at 09:58, zubair.syed <[email protected]> wrote:

    Hi Guys,

     

    I would like to connect two VPC pair (Nexus 5672) using Layer 3 port-channel, can you please tell me what would be the configuration like?

     

    Thanks, 




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  • ajCCIE2bajCCIE2b

    vPC supports only L2 ether channels not L3

     

    That's not entirely true. See the following Cisco documentation specifying what it is supported vs recommended:

     

    "This topology is supported for unicast traffic but not for multicast traffic. In this topology, we recommend that you use Layer 3 interfaces instead of vPC interfaces to connect routers to Cisco Nexus 5500 Platform switches whenever possible."

    http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/operations/n5k_L3_w_vpc_5500platform.html#wp999181

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  • Sukhjit.HayreSukhjit.Hayre

    aj - that's L3 SVI's at the Nexus end

    OP was asking to connect a L3 ether-channel

    "A Layer 2 port-channel only is supported with vPC (no Layer 3). The port-channel can be configured in access or
    trunk switchport mode. Any VLAN allowed in the vPC member port is by definition called vPC VLAN. The vPC
    VLAN must then be allowed on vPC peer-link."

    see page 34


    so technically your ref as far as the Nexus is concerned is L2 ether-channel with IEEE 802.1q tagged Vlans



    On Sun, May 31, 2015 at 12:15 AM, ajCCIE2b <[email protected]> wrote:

    imageSukhjit.Hayre:
    vPC supports only L2 ether channels not L3

     

    That's not entirely true. See the following Cisco documentation specifying what it is supported vs recommended:

     

    "This topology is supported for unicast traffic but not for multicast traffic. In this topology, we recommend that you use Layer 3 interfaces instead of vPC interfaces to connect routers to Cisco Nexus 5500 Platform switches whenever possible."

    http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/operations/n5k_L3_w_vpc_5500platform.html#wp999181




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  • zubair.syedzubair.syed

    Hi Guys,

    Thanks for the reply,

    It would be nice if I INE could enable a feature that lets us draw a small diagram in the post to support query/reply.

     

    5k-1 ----VPC Peer----- 5k-2 

     

    5k-3----VPC Peer------5K-3 

     

    I would like to connect cross connect between

    5k-1 <------> 5k-3

     

    5k-2 <------> 5k-4

     

    I would like to make these corss connects as layer 3 links and also want to bundle these links together to have maximum use of bandwidth. My question is that is there way to bundles these links together in layer 3 port-channels?

    One solution I can think of is to make these links layer 3 and run OSPF over them, it wont be a layer 3 port-channel but OSPF will do the load balancing because of equal cost.

     

    Any thoughts?

     

    Thanks,

    Zubair

     

     

     

     

     

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  • Sukhjit.HayreSukhjit.Hayre
    zubair - follow this guide for supported designs it explains things simply if you've not found the information in the vPC best practices guide




    On Sun, May 31, 2015 at 12:38 PM, zubair.syed <[email protected]> wrote:

    Hi Guys,

    Thanks for the reply,

    It would be nice if I INE could enable a feature that lets us draw a small diagram in the post to support query/reply.

     

    5k-1 ----VPC Peer----- 5k-2 

     

    5k-3----VPC Peer------5K-3 

     

    I would like to connect cross connect between

    5k-1 <------> 5k-3

     

    5k-2 <------> 5k-4

     

    I would like to make these corss connects as layer 3 links and also want to bundle these links together to have maximum use of bandwidth. My question is that is there way to bundles these links together in layer 3 port-channels?

    One solution I can think of is to make these links layer 3 and run OSPF over them, it wont be a layer 3 port-channel but OSPF will do the load balancing because of equal cost.

     

    Any thoughts?

     

    Thanks,

    Zubair

     

     

     

     

     




    INE - The Industry Leader in CCIE Preparation

    http://www.INE.com



    Subscription information may be found at:

    http://www.ieoc.com/forums/ForumSubscriptions.aspx

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