Spanning VLAN en Netgear Switchs across Cisco devices.

[torbianchi]

I have severar Cisco 2960 Switches colapsing to two Cisco 4500 backbone switches distributed in a doeble star configuration. Recently I begun adding S3300 Netgear switches that work better with video traffice and we need to keep same some vlans spanning in different newgear switches. Fron any device connected to one of those netgear switches I can ping devices in other vlans no matter they are on Cisco 4500 backbone switches or even in peripheral Cisco 2960, but we can't ping devices in the same vlan connected in other switch. We can only ping same vlan devices located in the same switch or the ip of the deffault gateway for the vlan that is defined in Cisco 4500 backbone. All trunks making the star are defined as trunks and the STP is defined to make traffic to priorize one of the backbones for all vlans. Have anybody ideas to make devices in same vlan but different switch to see each other?

[schumaku]

Not a lot of information on the network the VLANs.  Suspect we face just a problem with the configuration of the trunk ports connecting the switches. The trunk ports on the S3300 must not configured as stacking ports, the VLANs you need to interconnect must be defined as tagged on the trunk ports.  

[torbianchi]

Thank you for your answer. Each S3300 switch has two trunk ports pointing each Cisco 4500 distribution switch. Each trunk port has only two VLANS, vlan 1 (administration) which is untegged and vlan 112 that is tagged.  Those vlans are defined in distribution switches. Vlan 112 is defined in S3300 as Static.  From ports of each S3300 we can read no only internet but other devices in other vlans; but they can't communicate between devices in vlan 112 located in different switches.