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differance between primary and secondary Private VLAN???

how to differentiate primary and secondary private VLAN??? what is the benifit ????

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Re: differance between primary and secondary Private VLAN???

When a packet is transmitted out of a PVLAN host or trunk port, the packet logically belongs to the primary VLAN .A packet received on a PVLAN host port belongs to the secondary VLAN. A packet received on a PVLAN trunk port belongs to the secondary VLAN, if the packet is tagged with a secondary VLAN or the packet is untagged and the port's native VLAN is a secondary VLAN. For informations, refer,

http://www.cisco.com/en/US/products/hw/switches/ps4324/products_configuration_guide_chapter09186a008011c8d2.html#1121802

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