One of our user not able to connect to network and when I see the log the following message displayed. As far as I know that we can run maximum of 64 spanning tree instances. Hence do you any solution to avoid this problem. Please advice?.
Please provide good solution and documentation where I can find more information on the same.
%SPANTREE_VLAN_SW-2-MAX_INSTANCE: Platform limit of 64 STP instances exceeded. No instance created for VLAN918 (port Fa0/12).
you know after we reboot that switch after couple of minutes, user were able to connect and get the IP for his machine but our client is looking for perminant solution...So please adivce
Your inputs will be highly appreciated.
The error message is self-explanatory:
The switch supports per-VLAN spanning-tree plus (PVST+) and rapid PVST+ with a maximum of 64 spanning-tree instances. One spanning-tree instance is allowed per VLAN. See the "Normal-Range VLAN Configuration Guidelines" section for more information about the number of spanning-tree instances and the number of VLANs. The switch supports IEEE 802.1Q trunking for sending VLAN traffic over Ethernet ports.
Simple way to deal with this s by cleariing the unused VLAN's on that Trunk (port fa0/12)
Please rate all posts.
Thank you very much for feedback..
1st that Fa 0/12 interface is connected to end user not to the switch.
2nd we are not running VTP in our network.
Please provide me solution for this issue...
The following information have been requested to you.
Also, you know Cisco TAC Engineer recomended that if upgrade the switch software then we will able to have 250 STP instance and provded me the following links. Please need your valuable inputs.
Enhanced software image (EI) support 250 VLANs.
stdsa#show vtp status
VTP Version : 2
Configuration Revision : 7
Maximum VLANs supported locally : 250
Number of existing VLANs : 106
VTP Operating Mode : Server
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xEC 0xFB 0x9D 0x49 0x84 0x8D 0x3B 0x8A
Configuration last modified by 172.27.91.3 at 10-28-93 04:28:41
Local updater ID is 172.27.91.3 on interface Vl1 (lowest numbered VLAN interface found)
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/3, Fa0/4, Fa0/5, Fa0/6, Fa0/7, Fa0/8, Fa0/9
Fa0/10, Fa0/11, Fa0/16, Fa0/17, Fa0/18, Fa0/19
Fa0/20, Fa0/21, Fa0/22, Fa0/23, Fa0/24
916 VLAN0916 active
917 VLAN0917 active
918 VLAN0918 active Fa0/12
919 VLAN0919 active Fa0/13
920 VLAN0920 active Fa0/14
921 VLAN0921 active Fa0/15
922 VLAN0922 active
923 VLAN0923 active
924 VLAN0924 active
925 VLAN0925 active
926 VLAN0926 active
927 VLAN0927 active
928 VLAN0928 active
929 VLAN0929 active
930 VLAN0930 active
931 VLAN0931 active
stdsa#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/1 on 802.1q trunking 1
Fa0/2 on 802.1q trunking 1
Gi0/1 on 802.1q trunking 1
Gi0/2 desirable 802.1q trunking 1
Port Vlans allowed on trunk
Port Vlans allowed and active in management domain
Port Vlans in spanning tree forwarding state and not pruned
Yes, that's because the current IOS is limited to 64 vlan intances. You currently have 106 vlans which exceeds the limitation. You either remove the rest of the vlans that exceeds the 64 limitation or upgrade to the TAC recommended IOS.
Please rate all posts.
No, you have to remove vlan from the database. Clearing the vlan from the trunk will not do it.
You have gone BEYOND the 64 vlan instances on this box.