For spanning tree, you can enable either Rapid per VLAN Spanning Tree (Rapid PVST+) or Multiple Spanning Tree. Rapid PVST+ is the devfault, but I like Multiple Spanning Tree, MST, (802.1s) better as it enables you to assign multiple vlans to the same spanning tree instance. spanning-tree mode mst
spanning-tree port type edge bpduguard default
spanning-tree loopguard default
spanning-tree mst configuration
name sl-mgmt
revision 1
instance 1 vlan 1-3499,3900-3967,4048-4093
instance 2 vlan 3500-3799
instance 3 vlan 3800-3899
interface port-channel1
description sl-csw01
switchport mode trunk
switchport access vlan 3
switchport trunk native vlan 2
switchport trunk allowed vlan 4-3967,4048-4093
spanning-tree cost 1
interface Ethernet1/1
description sl-csw01-te4/2
switchport mode trunk
switchport access vlan 3
switchport trunk native vlan 2
switchport trunk allowed vlan 4-3967,4048-4093
channel-group 1 mode active
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spanning-tree mode mst) enables the multiple spanning tree config mode. This basically enables spanning tree - (
spanning-tree port type edge bpduguard default) enables bpdu guard as a default on all edge ports. - (
spanning-tree loopguard default) enables loopguard as a default on all point-to-point links (not edge points).
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spanning-tree mst configuration) start of mst config mode. - (
spanning-tree cost) set the weight of the link for spanning tree. Higher value is a higher cost, and less desirable.
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