vlan15 interface on the core switch, vlan15 interface address is: 10.15.1.254, the vlan is not enabled DHCP, core switches trunk allows all vlan by vlan,

Core of the next layer to converge switch, convergence switch hit a vlan15, linked to the core switch light trunk opening is allowed to pass all vlan, the gathering switches are connected to the access layer switches mouth of the lower trunk trunk allows all vlan by vlan,

The upper mouth of the access layer switches are connected to the gathering, access layer switches and vlan15, linked to convergence layer switch light trunk opening allows all vlan by vlan,



Is now a problem: the access layer switches on vlan15 into physical front-end ports, so the terminal on the Settings cannot be achieved after IP communications, but the console line connection access layer switches ping this vlan15 interface address: 10.15.1.254 can be ping, telnet10.15.1.254 also successfully log in to the core switch,

summary: core switches and vlan15, interface address for 10.15.1.254, trunk port Settings allow all -- -- -- -- -- - convergence switch (whole trunk mouth, allowing all and hit a vlan15) -- -- -- -- -- - access layer switches (upper trunk allows all vlan by mouth, and create the vlan15, the console line can ping 10.15.1.254, Telnet to succeed the remote to the core switch) but so vlan15's terminal Settings cannot be achieved after IP communications,

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