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Technical Description
Untagged &
Trusted =SPcP
Trusted =CPcP
Trusted = Ipv4
Trusted = Ipv6
Trusted =MPLS
Figure 7
Priority Tagging Flowchart
On a trusted port, the EXP/DSCP priority information in the MPLS/IP header or
PCP bits in the Ethernet header is used to establish an internal priority. The
internal priority is used for further priority handling but does not alter or add any
priority in the frame. The internal priority translation is done according to a
mapping table customized by the operator.
6.1.4
Congestion Handling
In a multi service network there is a need to differentiate the processing of the
different flows in the congestion points. Typically a voice flow would require
low latency/jitter and thus higher priority than a best effort data flow with no
latency requirements.
18
Incoming
DA match
No
S -Tag
Yes
(outer tag)
No
Yes
No
Yes
No
No
No
Yes
No
Yes
No
Map to default priority
Yes
Yes
C-Tag
Yes
(outer tag)
Ipv 4
(0, 1 or 2
Yes
tags)
Ipv6
(0, 1 or 2
Yes
tags)
No
No
MPLS
(0, 1 or 2
tags)
No
1/221 02-CSH 109 172/1-V1 Uen E | 2012-11-07
Map to highest
priority
Map to
Priority
Acording to rule
Yes
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