Switching

[Manish0404]

Hi 

Please explain difference between extended vlan and standard vlan.

[Charles Hill]

Difference is the vlan range.  Extended vlans are used just like standard vlans, just a different range.

standard vlans are 1 - 1005

and 

extended vlans are 1006 - 4096

standard vlans are stored in the vlan.dat file while extended vlans are stored in the running config.

see link below for more info on extended vlans.

http://www.cisco.com/c/en/us/td/docs/ios/12_4t/12_4t15/ht_xvlan.html

Hope this helps

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Thanks

[Peter Paluch]

Hi Manish and Charles,

Just to add to Charles's answer, Cisco implemented VLANs in their normal range (1-1005) in times when there was no official open standard on what the VLANs are and how they carried across trunks. Also, the VTP protocol was designed with this range of VLANs in mind.

When the IEEE 802.1Q standard was developed, it defined VLAN IDs in the range of 0-4095, with VLAN IDs 0 and 4095 being reserved. Clearly, this range of VLANs exceeded the range of VLANs formerly supported by Cisco switches and by VTP. As a result, Cisco declared the 802.1Q VLANs outside its former range of 1-1005 as extended range VLANs. However, obviously for backward compatibility with older switches, Cisco did not update VTP to support the extended range VLANs (only when VTPv3 came out, it supported the entire range of all VLANs), and they kept the distinction between the original VLAN ID range they supported (1-1005), and the extended range that came in with 802.1Q (1006-4094). And so it remains up to this day.

Best regards,
Peter