3. 3
RPR Introduction
An important trend in networking is the migration of packet-
based technologies from Local Area Networks to Metropolitan
Area Networks (MANs).
The rapidly increasing volume of data traffic in metro networks
is challenging the capacity limits of existing transport
infrastructures based on circuit-oriented technologies like SONET
and ATM.
Packet based transport technology is considered by many to be
the only alternative for scaling metro networks to meet the
demand.
4. 4
RPR Introduction
Packet based ring network for Metropolitan Area
Networks (MANs).
Towards to IEEE Standard, IEEE P802.17Based on Cisco
Spatial Reuse Protocol Support up to 255 station
attachments
Optimized for rings with maximum circumference of
2000 kilometers
5. 5
SONET and Ethernet in Metro Rings
SONET have two types of network:
• Access Network :
•Fully Meshed Network:
9. Resilient Packet Ring –
Emerging Metro Network
Architecture
9
Resilient Packet Ring is an emerging network architecture
and technology designed to meet the requirements of a packet-
based metropolitan area network.
Unlike incumbent architectures based on Ethernet switches or
SONET ADMs(Add-drop muxes), RPR approaches the metro
bottleneck problem with a clean slate.
10. RPR Layer Model
10
•Layer model is consistent with 802 conventions.
• Layer diagram is used to describe the architectural
positioning and relationship of clauses within the
overall RPR MAC.
• The layer diagram is not a functional or block
diagram.
14. 14
Main components of RPR
Traffic classes:
There are three traffic classes in RPR:
class A – designed for high priority traffic, in particular
for flows with low delays and guaranteed link bandwidth
demands (e.g. VoD services)
class B – designed for medium priority traffic, in
particular for packets for which the traffic contract isn’t
possible to be filled (e.g. VoIP)
class C – designed for low priority traffic, in particular
for all best effort traffic (e.g. data transfer)