0 Replies Latest reply: Nov 23, 2019 6:23 AM by simon RSS

    Connecting 1 node shows multiple connections/interfaces




      Ive just installed VIRL for the first time, using ESXI, things seemed to look and run ok. That is until i started a simple layer 2 switch topology.


      Ive found even though im connecting just 1 cable/connection between nodes, when I do a show spanning tree, or show ip int brief, im seeing multiple interfaces all connected up rather than the ones ive specified.


      Ive tried searching for this in the forums but im obviously getting the key words wrong as i cannot find any answers.


      I also read that interface gi0/0 can be shutdown. And if i go in, i can manually shutdown all the interfaces that are not required. But this seems incredibly clunky, i must be missing something. I cant believe this is how the product is sold.


      For example, i have a simple layer 2 topology, using 3 switches. Each has a single connection to each switch. the typical spanning tree setup for learning. Im expecting just 2 interfaces to be forwarding/block etc. but instead i see in this case 11 interfaces up and forwarding. I can go in and shut down 9 interfaces, but that surely isnt how its supposed to work?


      Any help would be thankfully received.




      Example show command below:


      Switch#show spanning


        Spanning tree enabled protocol ieee

        Root ID    Priority    32769

                   Address     5e00.0000.0000

                   Cost        4

                   Port        1 (GigabitEthernet0/0)

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

        Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)

                   Address     5e00.0001.0000

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

                   Aging Time  300 sec

      Interface           Role Sts Cost      Prio.Nbr Type

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

      Gi0/0               Root FWD 4         128.1    P2p

      Gi0/1               Desg FWD 4         128.2    P2p

      Gi0/2               Desg FWD 4         128.3    P2p

      Gi0/3               Desg FWD 4         128.4    P2p

      Gi1/0               Desg FWD 4         128.5    P2p

      Gi1/1               Desg FWD 4         128.6    P2p

      Gi1/2               Desg FWD 4         128.7    P2p


      Interface           Role Sts Cost      Prio.Nbr Type

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

      Gi1/3               Desg FWD 4         128.8    P2p

      Gi2/0               Desg FWD 4         128.9    P2p

      Gi2/1               Altn BLK 4         128.10   P2p

      Gi2/2               Desg FWD 4         128.11   P2p