120 CHAPTER 8: VLAN-VPN C ONFIGURATIONYou can execute the vlan-vpn enable or vlan-vpn uplink enable command for a port,but do not execute both of the two commands for a port.When the TPID field is set to the default value (that is, 0x8100), a port can serve as anuplink port no matter whether or not you enable the VLAN-VPN uplink function forthe port. However, if the TPID field is not set to 0x8100, you need to enable theVLAN-VPN uplink function for the port if you want to make the port an uplink port.VLAN-VPNConfigurationExampleThis Section contains a VLAN-VPN configuration example.Network requirements ■ Switch A and Switch C are S5500 series switches. Switch B is a switch comes fromanother vendor, which uses a TPID value of 0x9100.■ Two networks are connected to the Ethernet1/0/1 ports of Switch A and Switch Crespectively.■ Switch B only permits packets of VLAN 10.■ It is desired that packets of VLANs other than VLAN 10 can be exchanged betweenthe networks connected to Switch A and Switch C.Network diagram Figure 31 Network diagram for adjusting TPID valuesDisplay VLAN-VPNconfiguration informationabout all portsdisplay portvlan-vpnYou can execute the display command in anyview.Table 108 Adjust TPID values for VLAN-VPN packets (continued)Operation Command Description
