Has anyone encountered issues with creating a vlan or trunking between 6509 and 3750? When we enable the vlan 143 (don't know why this vlan number) or enable trunking to include vlan 143, the 6509 starts dropping other vlans and goes into the spanning tree loop.
sh ver for 6509
Cisco Internetwork Operating System Software
IOS (tm) MSFC2 Software (C6MSFC2-JK2SV-M), Version 12.1(11b)E11, EARLY DEPLOYMENT RELEASE SOFTWARE (fc2)
"Cat3570 supports 128 spanning-tree instances. If a switch has more active VLANs than supported spanning-tree instances, spanning tree can be enabled on 128 VLANs and is disabled on the remaining VLANs. If you have already used all available spanning-tree instances on a switch, adding another VLAN anywhere in the VTP domain creates a VLAN on that switch that is not running spanning-tree. If you have the default allowed list on the trunk ports of that switch (which is to allow all VLANs), the new VLAN is carried on all trunk ports. Depending on the topology of the network, this could create a loop in the new VLAN that would not be broken, particularly if there are several adjacent switches that all have run out of spanning-tree instances. You can prevent this possibility by setting allowed lists on the trunk ports of switches that have used up their allocation of spanning-tree instances. "
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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