VLAN not populating STP database

[Mike 1]

Hello, I've run into a strange issue where a VLAN (917) is assigned to  interfaces and port-channels but not active in STP.

I've created the VLAN on the 2900 switch, issued the spanning-tree vlan 917 command but it's still in the no spanning-tree config. I see that it's active and forwarding in our core switches. The core switch is forwarding the VLAN to this 2900 switch and is the root for vlan 917. The core switch and the 2900 have a trunk and layer connectivity directly between them. 

no spanning-tree vlan 724,726,730-735,799-809,900,915-921,950,955,980,998,1100

#sh spanning-tree vlan 917

Spanning tree instance(s) for vlan 917 does not exist.

#sh vlan id 917

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
917 DMZ-172.27.103.0 active Gi1/0/11, Gi1/0/12, Gi2/0/11, Gi2/0/12, Po1, Po2

Am i missing something obvious? 

thanks,

Mike

[balaji.bandi]

Not sure how your network connected,

you have command here 

no spanning-tree vlan 724,726,730-735,799-809,900,915-921  ( 917 come inside this range right) ?

Other note STP working on L2 network not on L3 Interface, to conclude better can you share the interface configuriaton (port-channel) and show spanning tree information.

[Mike 1]

here ya go and thanks

yes, it's in that range but i've already issue the spanning-tree vlan 917 command

Current configuration : 133 bytes
!
interface Port-channel12
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
end

interface Port-channel2
description To-BB01
switchport mode trunk
end

sh spanning-tree vlan 917

VLAN0917
Spanning tree enabled protocol rstp
Root ID Priority 9109
Address 0018.74ab.e940
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 9109 (priority 8192 sys-id-ext 917)
Address 0018.74ab.e940
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 480

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/13 Desg FWD 4 128.13 P2p
Gi1/14 Desg FWD 4 128.14 P2p
Gi1/29 Desg FWD 4 128.29 P2p
Gi1/33 Desg FWD 4 128.33 P2p
Gi1/38 Desg FWD 4 128.38 P2p
Te3/3 Desg FWD 2 128.259 P2p
Te3/4 Desg FWD 2 128.260 P2p
Te3/5 Desg FWD 2 128.261 P2p
Te3/6 Desg FWD 2 128.262 P2p
Gi4/2 Desg FWD 4 128.386 P2p
Po1 Desg FWD 2 128.1665 P2p
Po10 Desg FWD 3 128.1666 P2p
Po11 Desg FWD 3 128.1667 P2p
Po12 Desg FWD 3 128.1668 P2p
Po100 Desg FWD 4 128.1669 P2p
Po200 Desg FWD 3 128.1670 P2p
Po202 Desg FWD 3 128.1672 P2p

[balaji.bandi]

Do you have VLAN database on other switches ? create a VLAN 917 on other switch.

also you should see the logs on other switch about VLAN 917 when the Spanning tree convergence take place.

Post other switches spanning tree information to undertand the issue.

[paul driver]

Hello

Has that vlan been propergated to the other switches when it was created?

conf t
vlan 917
exit

spanning-tree vlan 917

show vlan brief
show vlan internal usage
show vlan mapping