4 Replies Latest reply: May 11, 2019 8:56 AM by Micheline RSS

    Nexus 7K bridge-domains with VXLAN

    Jaime

      Hello all

       

      Has anybody had any success configuring bridge-domains on Nexus 7Ks?

      It seems it only pertains to VXLAN but there is very little documentation on how to get this working in BD-Oriented mode.

      I am just trying to practice every variation with VXLAN as I prep for the lab exam.

      Any guidance is greatly appreciated!

         
        • 1. Re: Nexus 7K bridge-domains with VXLAN
          Micheline

          Hello Jaime--I have not seen a ton of documentation just on BDI, but the https://www.cisco.com/c/en/us/td/docs/switches/datacenter/pf/configuration/guide/b-pf-configuration/Forwarding-Configura… talks about SVI/BDI and the configurations are pretty much identical whether you configure an SVI or a BDI.

           

          For purposes of prepping for the lab exam, I would suggest that the areas to concentrate on VXLAN is troubleshooting (overlay and underlay) and VXLAN with vPC.

           

          MM

          • 2. Re: Nexus 7K bridge-domains with VXLAN
            Jaime

            Hi MM,

             

            Thank you for your response. In particular, I am having trouble assigning a BD to a host facing port. 'show bridge-domain' show it as operational down, but not seeing anything in the config guide to further explain how to configure this. I see references to an encapsulation profile, vsi, etc - thats whats confusing me on how we configure this towards a host facing port. The problem is you cant configure a BD and VLAN with the same ID, it gives you an error. So it seems you have to use one or the other but you have to use BDs when working with VXLAN on N7Ks.

             

            interface Ethernet5/18

              no shutdown

              service instance 1 vni

                no shutdown

                encapsulation profile vsi_10_to_50010  default

             

            F3-LEAF-1(config-if)# show bridge-domain

            Bridge-domain 10  (1 ports in all)

            Name:: Bridge-Domain10

            Administrative State: UP               Operational State: DOWN

                    vni50010

                    VSI-Eth5/18.1

             

            There are no STP instances for this BD either. I typically first get CE working, and check STP to make sure the host facing port is FWD.

            • 3. Re: Nexus 7K bridge-domains with VXLAN
              Jaime

              Actually, it just came up

              Not sure what I did differently this time but it looks good!

               

              F3-LEAF-1(config)# show bridge-domain

               

              Bridge-domain 10  (1 ports in all)

              Name:: Bridge-Domain10

              Administrative State: UP               Operational State: UP

                      vni50010

                      VSI-Eth5/18.1

               

              F3-LEAF-1(config)# show spanning-tree bridge-domain 10

              BD0010

                Spanning tree enabled protocol rstp

                Root ID    Priority    32778

                           Address     00de.fb5b.b543

                           This bridge is the root

                           Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec

               

               

                Bridge ID  Priority    32778  (priority 32768 sys-id-ext 10)

                           Address     00de.fb5b.b543

                           Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec

               

               

              Interface        Role Sts Cost      Prio.Nbr Type

              ---------------- ---- --- --------- -------- --------------------------------

              VSI-Eth5/18.1    Desg FWD 1         128.709  P2p

               

               

              Now to continue with the overlay!

              • 4. Re: Nexus 7K bridge-domains with VXLAN
                Micheline

                Excellent....  I have to tell you, I can't count the number of times I'd be saying to myself, this should work, why's it not working?! only to have some timer ticking down, and then have it come up some random time later.

                 

                There are two monster timers out there to beware of... the OTV timer and the vPC member ports timer.  Both are 240 seconds and not subject to configuration.

                 

                Good luck with the overlay!  Let us know how it goes.  MM