You use each range slightly differently. The switch is physically limited in the number of VLANs it can support. The hardware also shares this available range with its VSANs.
Table describes the details of the VLAN ranges. Cisco default. You can use this VLAN, but you cannot modify or delete it.
You can create, use, modify, and delete these VLANs. You can create, name, and use these VLANs. You cannot change the following parameters:. You cannot create, delete, or modify any VLANs within the block reserved for internal use. By default, the system allocates VLANs numbered to for internal use.
VLAN is also reserved for internal use by the switch. You cannot use, modify, or delete any of the VLANs in the reserved group. You can display the VLANs that are allocated internally and their associated use. VLANs are numbered from 1 to All configured ports belong to the default VLAN when you first bring up the switch. You create a VLAN by assigning a number to it; you can delete VLANs as well as moving them from the active operational state to the suspended operational state.
All the ports are assigned to VLAN1 by default. Beginning with Cisco release 5. Once a VLAN is created, it is automatically in the active state. The traffic does not flow and the packets are dropped. If you enter a number that is assigned to an internally allocated VLAN, the system returns an error message. A VLAN is a group of end stations with a common set of requirements, independent of physical location. Traffic between VLANs must be routed.
These VLANs are organized into several ranges; you use each range slightly differently. You cannot use an extended range VLAN that has been allocated for internal use. With earlier releases, enter the show vlan internal usage and show cwan vlans commands. The TrBRF can be extended across a network devices interconnected via trunk links. For source routing, the switch appears as a single bridge between the logical rings. You can configure two types of TrCRFs in your network: undistributed and backup.
When you specify the maximum hop count, you limit the maximum number of hops an explorer is allowed to traverse. If a port determines that the explorer frame it is receiving has traversed more than the number of hops specified, it does not forward the frame. The TrCRF determines the number of hops an explorer has traversed by the number of bridge hops in the route information field.
Figure illustrates the backup TrCRF. Tables through show the default configurations for the different VLAN media types. When creating and modifying VLANs in your network, follow these guidelines and restrictions:. You can cause inconsistency in the VLAN database if you manually delete the vlan. Note VLANs support a number of parameters that are not discussed in detail in this section. To display the VLAN configuration, enter the show vlan command. If the switch is in VLAN transparent mode, use the copy running-config startup-config command to save the VLAN configuration to the startup-config file.
After you save the running configuration as the startup configuration, use the show running-config and show startup-config commands to display the VLAN configuration. You can configure extended-range VLANs only in global configuration mode.
You use the interface configuration command mode to define the port membership mode and add and remove ports from a VLAN. The results of these commands are written to the running-config file, and you can display the file by entering the show running-config command. Release By default, the VLAN locking is disabled. The switch supports only IEEE You configure a port to belong to a VLAN by assigning a membership mode that specifies the kind of traffic the port carries and the number of VLANs to which it can belong.
VTP is not required. To participate in VTP, there must be at least one trunk port on the device connected to a trunk port of a second device. IEEE You can also modify the pruning-eligible list to block flooded traffic to VLANs on trunk ports that are included in the list. VTP is recommended but not required. You can have dynamic-access ports and trunk ports on the same device, but you must connect the dynamic-access port to an end station or hub and not to another device.
To participate in VTP, at least one trunk port on the device must be connected to a trunk port of a second device. The vlan. If the VTP mode is transparent, they are also saved in the device running configuration file. You use the interface configuration mode to define the port membership mode and to add and remove ports from VLANs.
The results of these commands are written to the running-configuration file, and you can display the file by entering the show running-config privileged EXEC command. When you save VLAN and VTP information including extended-range VLAN configuration information in the startup configuration file and reboot the device, the device configuration is selected as follows:. Ensure that you delete the vlan. This ensures that the switch reboots correctly on a reset.
Follow these guidelines when creating and modifying normal-range VLANs in your network:. Normal-range VLANs are identified with a number between 1 and The switch supports 64 spanning tree instances. Depending on the topology of the network, this could create a loop in the new VLAN that would not be broken, particularly if there are several adjacent switches that all have run out of spanning-tree instances.
You can prevent this possibility by setting allowed lists on the trunk ports of switches that have used up their allocation of spanning-tree instances. Follow these guidelines when creating extended-range VLANs:. You cannot include extended-range VLANs in the pruning eligible range. You should save this configuration to the startup configuration so that the device boots up in VTP transparent mode.
Otherwise, you lose the extended-range VLAN configuration if the device resets. The switch supports Ethernet interfaces exclusively. You can cause inconsistency in the VLAN database if you attempt to manually delete the vlan. If you want to modify the VLAN configuration, follow the procedures in this section.
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