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TOM FRANCHINA
Level 1
Level 1

We have a 3850x Stack that has several VLANs associated to the ports.

Show VLAN (abbreviated list)

40   Krembs-Basement        active    Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5
41   Park_G                          active    Gi7/0/44
42   ACC                              active    Gi3/0/13
108  Vendor-Vlan                 active    Gi1/0/25, Gi4/0/20, Gi4/0/29, Gi5/0/33, Gi6/0/3
512  Credit-Union-BGH        active    Gi1/0/28, Gi2/0/21, Gi3/0/28, Gi4/0/26

 

We configured port g7/0/44 for VLAN 41:

interface GigabitEthernet7/0/44
 switchport access vlan 41
 switchport mode access
 spanning-tree portfast
 spanning-tree bpduguard enable
end
----------------------------------------------------

and we are unable to get the PC running on the VLAN41. The port is up/up

Show int g7/0/44

GigabitEthernet7/0/44 is up, line protocol is up (connected)

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

But nothing in the MAC Table:

sho mac address-table int g7/0/44
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----

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

There is no spanning-tree allowed commands applied for the stack that would block VLAN41. 

Show spanning-tree vlan 41

VLAN0041
  Spanning tree enabled protocol rstp
  Root ID    Priority    16384
             Address     0024.f967.8c29
             Cost        8
             Port        113 (GigabitEthernet2/1/1)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32809  (priority 32768 sys-id-ext 41)
             Address     34db.fd3d.1f00
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/1/1             Altn BLK 4         128.49   P2p
Gi2/1/1             Root FWD 4         128.113  P2p
Gi2/1/4             Altn BLK 4         128.116  P2p
Gi7/0/44            Desg FWD 4         128.428  P2p Edge

  

Other Stacks connected to core have no issues with VLAN41. Today we tried VLAN42 and that has the same problem... but 108 and 512 have no issues. What other commands or methods could I use to help troubleshoot the problem. 

 

Thanks... Tom

 

 

Comments
Brad Martin
Level 3
Level 3

What version are you running. We are running 3.3.5 and are seeing similar behaviour, but in only one of the two stacked switches.

TOM FRANCHINA
Level 1
Level 1

Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.03.01SE RELEASE SOFTWARE

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