The basic QoS provisioning concept consists of the following stages:
1. For each port one or more customized flow identification tables (FIT) can be
assigned.
An FIT can be assigned either to an entire physical port, or to a fraction of a
physical port, i.e. to a so-called “virtual port”. Only E-NNI trunk ports can be split
into virtual ports each having an FIT assigned. A virtual port can be defined by
means of a virtual port descriptor (VPD).
In case more than one FIT is assigned, each FIT is related to usually one virtual
port. Each FIT may also be related to several virtual ports, provided they are
identified by the same virtual port descriptor (VPD).
2. The flow identification tables contain the identification criteria for the flows (for
example the values of the C-VID and/or C-UP). Furthermore, the flow
identification tables contain a reference identifying the assigned QoS profile.
Up to 2000 flow identification tables are supported per network element.
3. The QoS profiles contain the provisioning parameters (CIR, PIR, traffic class).
Using this method of QoS provisioning via QoS profiles can be enabled or disabled on
a per-NE basis.
On a per-port basis you can decide to only use default QoS profiles, or to define your
own QoS profiles in order to accomplish flow configuration.
Provisioning defaults
The parameter settings in the default QoS profiles for customer-role and network-role
ports are:
Port role CIR PIR TC
Customer-role MAX MAX 0
Network-role MAX MAX T
The traffic class “T” is the so-called “transparent traffic class”. The p-bits of the
outermost tag (S-UP of the S-tag, or UP of the VLAN tag) remain unchanged, i.e. keep
their value which has been assigned by a data unit anywhere upstream.
Explicit provisioning of the flow identification at network-role ports is only intended in
the case of so called external network-network interfaces (E-NNIs) connecting to the
network of other operators, or to trunking routers, respectively.
Traffic provisioning
Quality of Service provisioning
....................................................................................................................................................................................................................................
365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
8-95
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