VLANs are numbered from 1 to 4094 for each VDC. The write-erase procedure does not restore the default reserved VLAN range to 3968 to 4094. To return to the default block of reserved VLANs (3968 to 4094), you must enter the Creating VLANs within this range is not allowed. This requires copy running-config to startup-config before Note: After switch reload, VLANs 2000-2127 will be reserved for internal use. This will delete all configs on vlans 2000-2127. A warning note is displayed as in the following example: switch(config)# system vlan 2000 reserve When you change the range of reserved VLANs, the existing configurations for the new range of VLANs get deleted. Anytime you change the reserved block of VLANs for the device, you must do the following:Įnter the copy running-configuration startup-configuration command You cannot assign a previously created VLAN as part of the 128 range of reserved VLANs. For example, you can change the reserved block of VLANs to be 400 to 528. You can change the block of 128 reserved VLANs to occupy another range of 128 adjacent VLANs. You can display the VLANs that are allocated internally and their associated use.īeginning with Cisco NX-OS Release 5.2(1), the system allocates a block of 128 reserved VLANs (3968 to 4094) for these internal uses. You cannot use, modify, or delete any of the VLANs in the reserved group.
Add vlan to cisco switch software#
The software allocates a group of VLAN numbers for features like multicast and diagnostics, that need to use internal VLANs for their operation. All VDCs inherit the new reserved range of VLANs. When you reserve such a range, it frees up the range of VLANs that were allocated for internal use by default, and all of those VLANs are available for user configuration except for VLAN 4094. You can change the reserved VLANs to any other 128 contiguous VLAN range.
Add vlan to cisco switch series#
You cannot create, delete, or modify any VLANs within the block reserved for internal use.īeginning with Cisco release 5.2(1) for Cisco Nexus 7000 Series devices, VLANs 3968 to 4094 are reserved for internal use in each VDC by default. These 80 VLANs and VLAN 4094 are allocated for internal device use. You cannot change the following parameters: You can create, name, and use these VLANs. You can create, use, modify, and delete these VLANs. You can use this VLAN, but you cannot modify or delete it. This feature must be enabled before you can configure VLAN interfaces.Ĭisco default. See the Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x for complete information on configuring VLAN interfaces, and subinterfaces, as well as assigning IP addresses. Each VLAN requires only one VLAN interface. In order to route traffic between VLANs, you must create and configure a VLAN interface for each VLAN. By default, the VLANs are in the active state and pass traffic.Ī VLAN interface, or switched virtual interface (SVI), is a Layer 3 interface that is created to provide communication between VLANs. Additionally, you can configure VLANs to be in the active state, which is passing traffic, or the suspended state, in which the VLANs are not passing packets. To communicate between VLANs, you must route the traffic.īy default, a newly created VLAN is operational that is, the newly created VLAN is in the no shutdown condition. For example, all the end stations in a particular IP subnet belong to the same VLAN. VLANs are usually associated with IP subnetworks.
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