I have a strange issue with spanning-tree on a VSS pair of C4507E+R switches.The ios version is 15.1
the core was configured to be the STP root for any BPDU forwarding.
I noticed that spanning tree was not running for a number of VLANs, in my attempt to "re-enable" spanning tree i issued a no spanning-tree vlan 1-4094 then spanning -enable vlan 1-4094. Now it appears that STP is completely disabled for all VLAN despite the attempt to re-enable.
for example, when I perform a show spanning-tree for VLAN10 I receive the following -
Spanning tree instance(s) for VLAN10 does not exist.
I will add that I am running etherchannel links between the core and the edge switches using mode on.
I have tried deleting the VLAN + SVI on the core and disconnecting all edge switches but no luck.
Can anyone offer any advice/ideas to get spanning-tree working again?
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