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April 15th, 2020 23:00
Disable spanning-tree on a per port basis
Hi,
I have 2 S3048-ON and 2 S5232F-ON.
If design a STP load-out. Now i`f been ask to connect the 2 switches with VLT to an other network environment.
The only requirement I`f got is to disable Spanning-Tree to form a L2 neighbor.
But it seen not to work. The commando is there. But does not work:
(conf-if-eth1/1/53)# spanning-tree disable
% Error: Interface ethernet1/1/53 is not in Layer-2 mode
The config of that port is:
interface ethernet1/1/53
description OtherNetwork
shutdown
channel-group 53 mode active
no switchport
flowcontrol receive off
Is there a way to shut to Spanning-Tree on ports?
Greetings
Palemro
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DELL-Josh Cr
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April 16th, 2020 09:00
Hi,
Is port 53 the one you are going to use vlt on? You may want to remove all configuration from the port. Then reconfigure it how you want.
DorfPinguin
8 Posts
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April 18th, 2020 07:00
Hi,
Spanning-Tree works only on layer2 interfaces. If your interface is configured with "no switchport", Spanning-Tree is disabled automatically. "no switchport" is invoked automatically, as soon as you add an interface to a port-channel. The default configuration of a port-channel is a layer2 interface, thus it has a spanning tree instance.
Based on your description I think, that you have to disable spanning tree on your port-channel 53 interface (on the interface "spanning-tree disable").