- 2950 SI: Maximum 64 STP instances, Maximum 128 VLANs.
- 2950 EI: Maximum 64 STP instances, Maximum 250 VLANS.
- 3550, 3560, 3750: Maximum 128 STP instances, Maximum 1005 VLANs.
If the number of STP instances exceeds, then you'll get
an error like this:
SPANTREE_VLAN_SW-2-MAX_INSTANCE: Platform limit of 64 STP
instances exceeded. No instance created for VLANxxx
Workarounds:
- Delete some VLANs.
- Set the switch to VTP mode transparent mode and manually prune VLANs off the trunk links so it doesn't know about the extra VLANs.
Solutions:
- Use MST instead of PVST.
- Upgrade the switch J
Commands:
show vlan sum
show spanning-tree summary
show log
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