12-01-2003 08:44 AM - edited 03-02-2019 12:03 PM
Greetings,
How to disable PVST on catalyst switch (w/o enabling MultipleSTP)? In the other words, I want STP works on catalyst switch exactly as on standard non-cisco switch (mono spanning tree).
Best regards,
Dmitry N. Hramtsov
12-01-2003 05:41 PM
In cat OS, you can use disable STP for all VLANs using
Console> (enable) set spantree disable ?
all Disable spanning tree all
mistp-instance Disable MISTP instances
In IOS based switched, you can use
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#no spanning-tree vlan ?
WORD vlan range, example: 1,3-5,7,9-11
Router(config)#no spanning-tree vlan 1-1005
Router(config)#
But I do not understand what you would be achieving by disabling STP
12-02-2003 02:10 AM
I do not want disable STP at all. What I want is just disable PVST extension. I want what my catalyst (3550 with EMI IOS) works just as non-cisco cheap switch (with mono STP like IEEE 802.1q requires).
Is it possible to configure catalyst in this manner?
Thanks for any help.
12-07-2003 05:46 AM
Since where is no sulition offered and documentation has no answer about that, I conclude that it is impossible to configure catalyst switch in the way I want. Dolefully.
Please correct me if I am wrong.
In any case, thanks to people who tried to help.
12-07-2003 07:23 AM
Hello.
802.1q can be enabled on trunks. This is, however, dependant on your hardware. "show port cap" will let you know if the line card supports 802.1q.
On CATOS the following command sets port 1/1 to trunk mode , trunk carries vlan 10 and uses dot1q.
set trunk 1/1 desirable 10 dot1q
On Native IOS it would be:
interface FastEthernet0/1
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
-Rob
12-07-2003 07:38 AM
Thank you for your answer, but it is not answer to my question. :)
I want to disable PVST extension, i.e. I want that catalyst will not send BPDUs to VLANs except BPDUs version 0 to native VLAN like IEEE 802.1Q requires. Many other non-cisco switches (for example Allied Telesyn switches, Intel switches and many others) works this way.
Is it possible to configure catalyst switch for this behavior?
12-07-2003 09:24 AM
I thought that was too easy ;-)
I beleive my answer is accurate however. (Hopefully someone will correct me if I am wrong.)
By using dot1q you define a unique spanning tree instance running on the native VLAN for all the VLANs in the network.
In terms of BPDUs, I beleieve verison is always 0 on both TC and Configuration BPDUs.
-Rob
12-08-2003 06:04 AM
The command:
#sh spanning-tree mst
% Switch is not in mst mode
can help you to see if using Multiple spanning trees.
And, entering the msd config mode can help you
to disable mst:
MINIC01S(config)#spanning-tree mst conf
MINIC01S(config-mst)#?
abort Exit region configuration mode, aborting changes
exit Exit region configuration mode, applying changes
instance Map vlans to an MST instance
name Set configuration name
no Negate a command or set its defaults
private-vlan Set private-vlan synchronization
revision Set configuration revision number
show Display region configurations
To use only BPDU on a specific VLAN on the router
you can use:
interface FastEthernet0/1.1
description LAN 1 MANAGEMENT
encapsulation dot1Q 1 native
Best Regards
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