%SPANTREE_VLAN_SW-2-MAX_INSTANCE: Platform limit of 64 STP instances

[azmath.hk]

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?.

Device:-

2950G Switch

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).

[azmath.hk]

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.

REgards,

Khan.

[azmath.hk]

Pls help me out

[Roberto Salazar]

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.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12122ea7/scg/swvlan.htm#

Simple way to deal with this s by cleariing the unused VLAN's on that Trunk (port fa0/12)

Please rate all posts.

[azmath.hk]

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...

[azmath.hk]

Please provide me that command how to clear STP instances in swtich...

[Roberto Salazar]

post your show int trunk, show vlan and show vtp stat.

[azmath.hk]

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.

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/2950_wc/scg/scg_vlan.htm#xtocid224831

####

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)

stdsa#show vlan

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

Fa0/1 1-4094

Fa0/2 1-4094

Gi0/1 1-4094

Gi0/2 1-4094

Port Vlans allowed and active in management domain

Fa0/1 1,100,200,500-501,505,801-846,901-950

Fa0/2 1,100,200,500-501,505,801-846,901-950

Gi0/1 1,100,200,500-501,505,801-846,901-950

Gi0/2 1,100,200,500-501,505,801-846,901-950

Port Vlans in spanning tree forwarding state and not pruned

Fa0/1 1,100,200,500-501,505,801-846,901-950

Fa0/2 1,100,200,500-501,505,801-846,901-950

Gi0/1 1,100,200,500-501,505,801-846,901-950

Gi0/2 1,100,200,500-501,505,801-846,901-950

[Roberto Salazar]

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.

[azmath.hk]

Please provide me the command to clear the trunk port for unused vlans...

[Roberto Salazar]

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.