Dell Force10 E1200i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 1022
Change the Default VLAN ID, Set the Null VLAN as the Default VLAN
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www.dell.com | support.dell.com To configure a port so that it has a native VLAN: Step 1 2 3 4 Task Command Command Mode Remove any Layer 2 or Layer 3 configurations from the interface. INTERFACE If the port has any configurations on it when you enter the command portmode hybrid, FTOS rejects the configuration, citing the following message: % Error: Port is in Layer-2 mode . Configure the interface for hybrid mode. portmode hybrid INTERFACE Configure the interface for switchport mode. switchport INTERFACE Add the interface as a member of one or more VLANs. [tagged | untagged] VLAN INTERFACE Change the Default VLAN ID By default, VLAN 1 is the Default VLAN. You can make another VLAN the default (which then enables you to configure VLAN 1). Task Make a VLAN other than VLAN 1 the default VLAN. Command Syntax default vlan-id Command Mode CONFIGURATION Set the Null VLAN as the Default VLAN In a Carrier Ethernet for Metro Service environment, service providers who perform frequent reconfigurations for customers with changing requirements occasionally enable multiple interfaces, each connected to a different customer, before the interfaces are fully configured. This presents a vulnerability because both interfaces are initially placed in the native VLAN, VLAN 1, and for that period customers are able to access each other's networks. FTOS has a Null VLAN to eliminate this vulnerability. When you enable the Null VLAN, all ports are placed into by it default, so that even if you activate the physical ports of multiple customers, no traffic is allowed to traverse the links until each port is place in another VLAN. Task Command Syntax Disable the default VLAN, so that all ports belong to the Null VLAN until configured as a member of another VLAN. default-vlan disable Default: the default VLAN is enabled (no default-vlan disable). Command Mode CONFIGURATION 1022 | VLAN
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