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Community Member

Precision

Hi,

Which are the differences between 802.1 P and 802.1 Q ?

thank you in advance.

2 REPLIES
Gold

Re: Precision

802.1q is the standard defining how to send frames between switches or other devices in multiple VLANs, by tagging the frame containing VLAN and other information about the frame. This is how you build "trunks" between switches. Cisco's ISL is a proprietary protocol that does the same thing.

802.1p is a standard for tagging frames with priority information for QoS, so that switches with multiple output queues can prioritize high-priority frames. It also has a role in multicast registration and filtering, but I don't believe this part is widely implemented.

Community Member

Re: Precision

Thank you very much

P. Martiny

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