Srp Overview
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Transcript of Srp Overview
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1 2000, Cisco Systems, Inc.IEEE SRP Tutorial March 2000
Spatial Reuse Protocol:Spatial Reuse Protocol:A Ring BasedA Ring Based
LAN / MAN / WANLAN / MAN / WANMAC ProtocolMAC Protocol
Mike TakefmanMike Takefman
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2IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
SRP GoalsSRP Goals
Improve economics via layer eliminationand BW multiplication
Provide fast protection and restoration
Enable Plug and Play operation
Support LAN, MAN and WAN applications
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3IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
Dedicated AccessPoP Ring
LeasedLines
Cable DataAccess Ring
Metro AccessRing
Server AccessRing
RegionalTransport
Ring
BackboneRing
RegionalTransport
Ring
HFCHFCHFCHFC
HFCHFC
HFCHFC
SiSi
SRP ApplicationsSRP Applications
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4IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
Accepted transport
architecture
Performance monitoringand self-healing
Expensive andinefficient for packets
Multiple equipment layers
Bandwidth inefficiency
SONET/SDH-BasedSONET/SDH-Based
TDM TransportTDM Transport
ProvisionedConnections
ProvisionedConnections ProtectionProtection
SONET
ADM
SONETSONET
ADMADMSONET
ADM
SONETSONET
ADMADM
SONET
ADM
SONETSONET
ADMADM
WorkingWorkingSONET
ADM
SONETSONET
ADMADM
SONET/SDHRing
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5IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
Runs over dark fiber, SONET, or WDMEnables transport mix and match
Provides efficient evolution path for existing networks
Provides optimized transport for greenfield builds
Transport Flexibility andTransport Flexibility and
EvolutionEvolution
SONETADM
SONETADM
SONETADM
SONETADM
SONETADM
SONETADM
SONETADM
SONETADM
SRPRing
WDM~~~~~~
~~~~~~
Dark Fiber
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6IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
Existing topologiesFDDI ring
Switched FDDI
ATM or Fast Ethernet
Point-to-point POS
Issues
BW limits
Complex load balanceMultiple boxes
Port counts
Previous Intra-POPPrevious Intra-POP
Connectivity OptionsConnectivity Options
SharedFDDI Ring
Internet Backbone
622 Mb/s ATM1 Gbps Ethernet
622-MbpsPOS
155- or 622- Mbps ATM100-Mb Ethernet
Internet Backbone
622-MbpsPOS
155-Mbps POS
Internet Backbone
FDDISwitch
XX XX
Internet Backbone
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7IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
SRP OverviewSRP Overview
Maximize BW efficiency
dual counter rotating ringsdestination stripping
statistical muxing of BFP
Extend IP functionality
over MAN & WAN Minimize provisioning
and configuration
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8IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
SRP OverviewSRP Overview
Multicast support
2 Traffic priorities on ring
High priority traffic has low latency patharound ring
SRP fairness algorithm (SRP-fa) controls
access to ring BW for low priority traffic
8 priority levels for Tx and Rx queueing
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9IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
SRP Cooperates with Layer 3 CoSSRP Cooperates with Layer 3 CoS
to Extend Functionalityto Extend Functionality
Layer 3 provides rich functionality and granular controls
MAC provides speed and simplicity
Enables low delay/jitter for voice and video packets
Layer 3IPLayer 3IP
Layer 2SRP MACLayer 2SRP MAC
Precedence Setting Rate Control
Congestion ControlRED/WRED
Granular SchedulingDRR on Eight Classes
Big Fat Pipes
High-Priority Bypass
Low-Priority Fairness
Precedence Mapping
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10IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
SRP fairness algorithm
Distributed algorithm
Propagates and usesMAC usage info
Source and forward ratecontrols
Rapid adaptation
and convergence
(1)(1)
(4)(4)
(2)(2)
(5)(5)(3)(3)
SRP OverviewSRP Overview
Node 1Node 1
Node 2Node 2
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11IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
SRP OverviewSRP Overview
Scalable: Bit-rate; Circumference of
ring; Up to 128 nodes
Intelligent Protection Switching (IPS)
Survivability in the event of single fiber /node failure, or signal degradation
Media independent protocolInitial implementation uses SONET/SDHframing
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12IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
SRP PacketSRP Packet
SRP is a media independent MAC layer protocol
The initial implementations utilizes ByteSynchronous HDLC within SONET/SDH framing(OC-12c, OC-48c, OC-192c)
Allows transport via: Dark Fiber; SONET/SDH;WDM
TransportTransport
OverheadOverheadPathPath
OverheadOverhead
FFLLAA
GG
MACMAC
HeaderHeaderPayloadPayload
FFLLAA
GG
FFCCSS
PayloadPayload
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13IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
Comparison with DQDBComparison with DQDB
No segmentation and reassembly
complete packets stored and forwarded
Distributed fairness without master nodes
Protection switching without master
High priority traffic for delay sensitiveapplications
No support for isochronous traffic
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14IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
Comparison with FDDIComparison with FDDI
Greater than 2x bandwidth improvement
both rings carry traffic
Destination stripping allows spatial reuse
No token to pass
FDDI-2 supported isochronous traffic &
master node
not generally implemented
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15IEEE SRP Tutorial March 2000 2000, Cisco Systems, Inc.
SummarySummary
Scalable packet ring technology
Bit-rate; Number of Nodes; RingCircumference
High bandwidth efficiency
Cost effectiveness
Distributed fault tolerance
LAN, MAN and WAN applications