When I set up a switch topology as below:
I configure the 3 interconnect link to Trunk, and all native vlan is vlan 99, I found on SwA,B,C, STP cann't block native vlan 99, that is, on SwA,B,C, all the vlan 99's STP status is forwarding; So I decide block this with the command " swicth trunk allow vlan ***", my question is: does this method is effective?
when Iãdesign a big campus LAN, how to design native vlan's deployment, such as the following topology?
SwA---SwB Core Layer
SwC---SwD Dist Layer
\ \ /\
\ \/ \
\ / \ \
SwE SwF Access Layer
all interconnect link is trunk, how to design native vlan?