Alcatel-Lucent 1643 AMS User's Operation Manual page 441

Traffic provisioning
Default user priority
A default user priority can be configured for each customer-role port. Possible values
are 0 (lowest priority) { 7 (highest priority) in steps of 1. The default setting is 0.
Provisioning of the default user priority does not apply to network-role ports.
The default user priority is treated differently depending on the tagging mode:
• LAN-VPN (M-LAN) mode
Incoming frames without a user priority encoding (untagged frames) are treated as
if they had the default user priority.
• IEEE 802.1Q VLAN tagging mode and provider bridge mode
Incoming frames without a user priority encoding (untagged frames) get a default
user priority assigned. This C-UP may be further on equal to a user priority given
by one of the provisioned flow descriptors. The subsequent traffic class assignment
for this flow, however, will overwrite this C-UP bits again.
Traffic classes
At each ingress port, the traffic class (TC) for each frame is determined. At
customer-role ports, this is done via the flow identification and the related provisioned
traffic class. At network-role ports, the traffic class is directly derived from the p-bits
of the outermost VLAN tag.
Depending on the operation mode, these traffic classes exist:
Provider bridge mode and IEEE
802.1Q VLAN tagging mode
with encoding of the dropping
precedence
IEEE 802.1Q VLAN tagging
mode without encoding of the
dropping precedence
Notes:
1. The support of dropping precedence encoding and evaluation can be enabled or disabled
per virtual switch by means of the QoS_osub configuration parameter (QoS_osub =
enabled/disabled). All virtual switches belonging to the same TransLAN
be provisioned equally for their TPID and this QoS_osub configuration parameter.
These tables show the traffic class encoding in the user priority bits:
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365-312-807R7.2
Issue 4, May 2007
The traffic class is encoded in the user priority bits
using p2 and p1. Thus, four traffic classes are
defined: 0, 1, 2, 3.
The traffic class is encoded in the user priority bits
using p2, p1, and p0. Thus, eight traffic classes are
defined: 0, 0-, 1, 1-, 2, 2-, 3, 3-. The "n" traffic
classes differ from the "n-" traffic classes in the
value of the p0 bit.
Alcatel-Lucent - Proprietary
See notice on first page
Classification, queueing, and scheduling
®
network must
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