03-18-2009 10:19 AM - edited 03-06-2019 04:41 AM
I need to allow spanning tree on VLAN 906. How can I remove that VLAN from config below?
Thanks.
spanning-tree mode pvst
spanning-tree extend system-id
no spanning-tree vlan 150,221,401-412,414-453,501-512,514-553,601-612,614-648
no spanning-tree vlan 650-653,701-712,714-753,801-812,814-853,901-912,914-953
no spanning-tree vlan 1001,1006-1012,1014-1035,1037-1053,1101-1109,1111-1112
no spanning-tree vlan 1114-1117,1119-1127,1129,1131,1133,1135,1137-1153,2001
no spanning-tree vlan 2002,2050,3000,3333
03-18-2009 10:19 AM
spanning-tree vlan 906
03-18-2009 10:21 AM
I have tried that and when I go look at my config it does not change.
03-18-2009 10:29 AM
Have you tried redoing the line, but instead of 901-912, do 901-905, 907-912?
HTH,
John
03-18-2009 10:37 AM
Yes I have tried that without any success. Could this result from the number of VLANs I have on the switch? Can only so many vlan have spanning tree enabled?
03-18-2009 11:03 AM
Hello Jason,
your understanding is correct low end switches can have more vlans defined then number of STP instances
It is likely the commands you see have been automatically inserted by the switch.
if you are not already doing it I suggest to manually configure the list of permitted vlans on all trunk ports including uplinks.
this can free some STP instance
Hope to help
Giuseppe
03-18-2009 11:22 AM
Sadly this Switch is the Core Switch in a hotel with a 1000 rooms. Each VLAN refers to specific room in the hotel. Is there anyway to get STP to run on every VLAN?
03-18-2009 11:30 AM
Hello Jason,
depending on the platform an IOS upgrade can help.
It can provide an higher number of concurrent STP instances
Also an IOS image capable of MST can overcome this limitation (MST can associate multiple Vlans to a single STP instance).
what model and IOS image is involved ?
Hope to help
Giuseppe
03-18-2009 11:36 AM
Model number: WS-C3550-24-SMI
System image file is "flash:c3550-ipbasek9-mz.122-25.SEE4.bin"
05-25-2021 06:23 AM
No answer yet?
Simple:
E.g. you have something like "no spanning-tree vlan 19" and some more settings like like "spanning-tree vlan 19-20,601-605 priority 28672" the solution to remove the "no [...]" entry is
1. spanning-tree vlan 19
=> this removes the "no [...]" setting
Because you already had the vlan 19 in the [priority setting, nothing else needs to be done here.
If you had as another example no vlan 19 included in the priority setting, simply add
2. spanning-tree vlan 19 priority 28672
Hope that helps.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide