12-23-2010 02:11 AM - edited 03-06-2019 02:40 PM
Please help - How many bits are reserved in 802.1q and ISL header for QoS.
Thanks in Advance
-Jigar
12-23-2010 02:16 AM
Hi Jigar,
For 802.1Q, 3 bits are reserved, yielding 8 different CoS classes. For ISL, there appear to be 2 bits reserved for priority purposes, yielding 4 different CoS classes. See the following URL for more info:
http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094665.shtml
Best regards,
Peter
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