Dscp/Prec Egress Remarking - Alcatel-Lucent 7450 Quality Of Service Manual

Service Egress QoS Policy
A combination of two access networks can be possible. If PBB encapsulation is used, the
configuration used for DE in SAP and SDP policies applies to both BVID and ITAG DE bits.
When both fields are used the BVID takes precedence.
IEEE 802.1ah Use Case
Figure 17
processing requirements highlighted in the 802.1ad use case apply to the 802.1ah BVID,
format and etype, these being identical with the 802.1ad STAG. In addition the DE bit from
the 802.1ah ITAG header may need to be processed following the same rules as for the related
field in the BVID/STAG: for example, the DE bit from the BVID header represents the QoS
associated with the "Ethernet Tunnel" while the DE bit from the ITAG represent the service
QoS.
CE UNI
PBB PE
In this example, the BVID is not used for a part of the network leaving only I-DEI bit from
the ITAG as the only option for a dedicated DE field. If both are included, then the QoS
information from the BVID is to be used.

DSCP/Prec Egress Remarking

DSCP/prec marking can be performed on egress for all services and with respect to the profile
of the packet.
The following commands can be used to remark the DSCP/prec values at a SAP egress:
204
illustrates an example of a PBB topology where the DE feature can be used. The
Figure 17: DE Aware PBB Topology
PBBN
(CE aware using
B-SAP
802.1 a/b/d &/or
802.1afITAG)
sap-egress <policy-id> create
fc <fc-name> create
dscp {dscp <dscp-name>|
prec {<ip-prec-value>|
7x50 PE1
MPLS
B-VPLS SDP
in-profile {<dscp-name>
out-profile <dscp-name>
[exceed-profile <dscp-name>]}
7x50 PE2
MPLS
SDP B-VPLS I-SAP
Quality of Service Guide
CE