question : switchport voice vlan untagged
as we know , command:" switchport voice vlan " has four option , untagged is one of them , as shown in the figure bottom . my quesiton is :without any tag, where could the "COS in 802.1p bits" exist ?
the follow figure come from this book :CCNP_SWITCH_642-813_Official_Certification_Guide.pdf
the follow figure come from this book :CCNP_SWITCH_642-813_Official_Certification_Guide.pdf
Comments
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Ryan82
Member Posts: 428
You are right, as I understand it with untagged there is no where to put the cos markings. -
szokp
Banned Posts: 17 ■□□□□□□□□□
according to following figure capture from the same PDF, maybe it is a printing fault?
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networker050184
Mod Posts: 11,962 Mod
Not 802.1q header, no priority bits. Set your DCSP to CoS maps correctly and your trunks will mark off that.An expert is a man who has made all the mistakes which can be made.