IP/MPLS Network Planning, Design, Simulation, Audit and Management
Transcript of IP/MPLS Network Planning, Design, Simulation, Audit and Management
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IP/MPLS Network Planning, Design,
Simulation, Audit and Management
Dave Wang, WANDL
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WANDL Overview
• Founded in 1986• Headquarters in Piscataway, New Jersey• Products: NPAT, IP/MPLSView,VPNView• Locations
– Domestic• New Jersey, Washington D.C., Illinois, California
– International• United Kingdom, Belgium, Italy, Taiwan, China
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WANDL Software Solutions
WANDL Network Planning Design & Optimisation
WANDL IP/MPLS Network Audit & Management
Voice
TDM
Access
ATM/FR
IP/MPLS
NPAT
Transport
Live Network Management
IP/MPLSView
VPNView
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WANDL Core Capabilities
• Routing Analysis– Path Tracing
• Design– Greenfield and Diversity
• Failure Simulation• Capacity Planning• Optimization
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DesignBackbone Design
Access Design
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Simulation
• Perform exhaustive failure simulation in script mode• Verify detailed simulation results via simulation report• Verify peak utilization for links under failure simulation
to resize network (if necessary)
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Capacity Planning
• Make recommendations on network expansion – forecasted network demands
• Determine where capacity is needed• Determine trunks that can be pruned• Tune link routing metrics• Import NetFlow end-to-end traffic data
– NetFlow v9, Arbor, cflowd, Crannog• Guessing traffic matrix
– if only interface traffic is available
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Design Automation
• Basic or Diversity Design• Path Computation• Diverse Path Computation• Network Grooming• Fast Reroute Path Computation• LSP Tunnel Sizing• Metric Balancing
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Proactive Service Audit
• Majority outages caused by human error• Info in router configuration files• Integrity Checks (IC) based on Config files
– Detect human errors– Detect operational errors
• Intelligent IC based on routing simulation– Routing anomalies– Security and ACL reachability– Network element failures
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IP/MPLS Management Features
– Integrated FCAPS– Provisioning support
• Generate VRF Configlets• Generate TE/FRR Configlets
– Multivendor support
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WANDL IP/MPLSView
IP/MPLS Core Platform (Routing, Design, Outage Simulation) IP/MPLS Core Platform (Routing, Design, Outage Simulation)
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Service Provider Challenges
• Multivendor• Multilayer• Multiprotocol• Multiservice
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Multivendor Challenges
• Hardware Vendor
• Hardware Vendor NMS– 5620 SAM, IPSC, iManager, JUNOscope
• Many Service Management vendors– HP, IBM, Lucent, Oracle, …
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Multivendor Challenges
• Language problems• Defaults• Inter-Op• Versions/Features• 3rd party NMS
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Language Problems
• ATM example: PVC– Alcatel means 5620– Cisco and Lucent means SPVC– Marconi means Permanently nailed
• Issues for human operators – to deal with different terminology
• Issues for modeling software (WANDL) – deal with differences automatically
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Language Problems
• Config files– Output of “show config”– IOS, IOX, JUNOS, …
• Can be very similar (Command Line Interface)• Can be very different (languages)
– Interfaces– Protocols– Routing, routing, routing, …
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Language Problems
• Same meaning– MPLS Traffic Engineering Tunnel– Label Switched Path
• Same meaning– Affinity/Mask– Admin Group
• Different meaning: MPLS Fast Reroute– Path protection– Link / Node protection
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Defaults
• 1000 means 1 MB or 1 Kb ?– Alcatel-Lucent, Cisco, Juniper, etc. different
conventions• MPLS-TE priority
– Conventions and defaults on priority and hold settings for LSP
– Different vendor implementations• OSPF reference bandwidth
– 100,000,000 is no longer adequate
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Inter-Op
• MPLS TE multiple color constraints– And ? Or ?– Different vendor interpretations on logic
• Naming Convention– Must name as Tunnelxxx or Tunnelx/y/z– Can be arbitrary
• Features and implementation details can be different– DS-TE RDM, MAM, etc.
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WANDL – 5620 SAM Integration
• Collect configuration and tunnel information from the 5620 SAM
• Offline design/analysis and upload changes to the live network– Service activation through SAM XML over
SOAP– Upload changed information to the SAM
• Bandwidth changes• Path (dynamic/explicit) and FRR properties• LSP definitions
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Multilayer Challenges• Shared Risk Link Groups (SRLG)
– IP/ATM over TDM– ATM/TDM over IP– IP over Optical/DWDM
• Common failure points with multiple layers– Conduit failure>multiple fibre
cuts>wavelengths failed>LSP paths down• LSP backup paths may share common
failure points with primary path
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Multilayer Challenges
• MPLS itself is a multilayer technology– Layer 3 : IP – Layer 2 : MPLS-TE
• Interaction between IGP and MPLS-TE– AutoRoute Announce
• Participate in topology state flooding or not– No AA
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Multiprotocol Challenges
• IGP : OSPF, ISIS, static– OSPF areas– ISIS level1/level2
• BGP : iBGP, eBGP, mBGP– route reflectors, confederation– Carrier Supporting Carrier (CSC)
• MPLS : LDP, RSVP– LDP– RSVP, CSPF
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MPLS Service Applications
• MPLS VPN – Layer 3 RFC2547-bis VPN
• Replacing ATM/FR services– Layer 2, PW, VPLS, CCC
• MPLS TE/FRR– Voice, Video, NGN
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Multiservice Challenges
• Voice– MPLS TE/FRR ?
• Data– Diversity
• Video– P2MP-TE ?
• CoS, QoS
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Multiservice Challenges
• Single or separate networks?– Internet– MPLS VPN– NGN
• Large service provider – may have separate network for each
• Small service provider – may merge all into a single network
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Summary
• In moving toward and IP/MPLS backbone, service providers are facing new and unexpected challenges including multiple vendor environments, multiple layer topologies, and multiple applications and services.
• Network management requires a high-level of visibility into the network in order to accurately model the various layers and interdependencies.
• The observed trend is toward consolidation of OSS tools to simplify data consistency across multiple sources, as well as tool management. Fewer tools that can address a broader scope.– WANDL's IP/MPLSView platform addresses fault-management,
configuration and performance in the FCAPS framework.
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NetworkNetworkVisualizationVisualization
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Access Homing Design
Input Output
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Wireless backhaul Design
The highlighted links are less than 3.91 miles.
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P2MP Hub selection
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9000 locations
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BackboneBackboneTopologyTopology
VisualizationVisualization
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Mesh Topology
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IP/MPLS Backbone
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Multi-vendor network
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Routers: 402 Cisco + JuniperInterfaces: 902 OC192 + OC48AS Nodes: 1103 PeeringAS Links: 2650
MPLS+BGP Network Scalability
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Network statistics Routers: 3114 CiscoInterfaces: 4912 ATM, OCxBGP speakers: 391
Two Levels of RR
Route Reflector Hierarchy
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Routers: 77 CiscoInterfaces: 158 OC3 + T3VPNs: 255
iBGP RR for VPN
# PE = 52
OSPF +MPLS VPN Network
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Routers: 1570 CiscoInterfaces: 4,230 STM1, ATM156M# VPN: 4,2431,862 BGP Neighbors
iBGP RR for VPN
ISIS + VPN Network
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Routers: 159 Cisco, Juniper, UnisphereInterfaces: 354 OC192/48/12/3, ET.,
MPLS Map with VT
Multi-vendor MPLS Network
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Routers: 143 CiscoInterfaces: 358 OC3 + T3OSPF Areas: 19
OSPF Area Scalability
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A Big OSPF Network
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Another View
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Topology: Advanced Protocol Filtering
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MPLS VPNMPLS VPN
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MPLS VPN
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Route Target Relationship View
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Questions