Last Updated on August 1, 2021 by Admin
Which are valid configurable VLAN ID numbers for 802.1Q networks?
IEEE 802.1Q supports configuring VLAN IDs 1 through 4094.
The 802.1Q standard specifies support for a maximum of 4,094 VLANs. (IDs 0 and 4095 are reserved.) Therefore, ID values of 1-4094 are assignable. In contrast, the valid range of configurable ISL VLANs is 1-1001. The following is a summary of VLAN IDs:
- 0 and 4095: Reserved
- 1: Cisco default management
- 2-1001: Available for Ethernet VLANs
- 1002-1005: Defaults for FDDI and Token Ring VLANs
- 1006-4094: Extended range available for Ethernet VLANs (802.1Q only)
Recognizing the differences between supported VLAN ID ranges highlights several issues in constructing a network of both ISL and 802.1Q VLAN networks. Ethernet VLAN IDs above the supported ISL range must be mapped to IDs within the range supported by ISL. Among other limitations, you are limited to eight mappings. This process of mapping 802.1Q to ISL VLAN IDs will further restrict and define which IDs are available to be used.
Layer 2 Technologies
Configure and verify VLANs