Rfc 1483; Quality Of Service - Avaya P550R User Manual

Chapter 1

RFC 1483

Quality of Service

1-4
Avaya P550R/P580/P880/P882 Multiservice Switch ATM Uplink Module User Guide, Version 2.0
RFC 1483 defines an encapsulation method for transporting
multiple protocols over the same or different VCs using the ATM
Adaptation Layer 5 (AAL5) protocol. Implementation is limited to
Permanent Virtual Circuits (PVCs). The ATM Uplink module
supports 802.3 Ethernet, as well as a routed Protocol Data Unit
(PDU) for layer 3.
The ATM Uplink module supports up to 128 Virtual Switch Ports
(VSPs) and LECs per module. A VSP is a single port on an ATM
Uplink module within the Avaya P550/P880 switch. It appears as a
switch port to the supervisor module and is bound to a VLAN by the
supervisor. Only one VSP may be bound to a particular VLAN per
ATM Uplink module.
* Notes:
50 Series modules require a license key in order to use RFC
1483. 80 Series modules are preconfigured for RFC1483
support. If you have a 50 Series ATM Uplink module, refer to
the Avaya P550/P880 Switch ATM Uplink Installation Sheet for
more information on the license key.
You can configure a module with both LANE and RFC 1483.
50 Series require you to purchase an RFC 1483 license key
for this feature.
QoS (Quality of Service) is a guarantee of throughput across a
network. It provides multiple "levels of service" based on user
configured parameters.
QoS is implemented in LANE by configuring sets of ATM traffic
parameters (QoS Sets) and associating these parameters with
different Ethernet frame priorities (0 - 7). A Data Direct Virtual
Channel Connection (DDVCC) is set up to a QoS capable LEC for
each QoS Set as needed.
A QoS Set consists of descriptors (PCR, SCR) that define traffic
behavior for a given category (CBR, rtVBR, nrtVBR and UBR). A
QoS Domain is a set of rules for mapping Ethernet frame priorities
to ATM QoS Sets. A QoS Domain also consists of a series of QoS Sets
and their priority mappings.