Traffic Engineering Beyond MPLS - Apricot Inc

107 Pages·2004·1.71 MB·English

Traffic Engineering Beyond MPLS
Apricot 2004 Tutorial
February 24, 2004
Kuala Lumpur, Malaysia
Arman Maghbouleh John Evans
Cariden Technologies, Inc. Cisco Systems, Inc.
arman @ cariden.com joevans @ cisco.com
(c) cariden technologies, cisco systems
TE Beyond MPLS Tutorial Apricot 2004 1
Carrier IP Backbone Engineering Models
Simple Dynamic Controlled
(cid:127) Emphasis on (cid:127) Emphasis on (cid:127) Emphasis on
Scalability Smart Network Asset Utilization
(cid:127) Low Overhead (cid:127) Service-Aware (cid:127) Optimize Offline
Protocols Protocols
– Static Explicit
– Pure IP – MPLS CSPF MPLS/ATM PVC
– No CoS – Diffserv/–TE
– 50% Upgrade
Simple++
(cid:127) Pure IP for scalability
(cid:127) Capacity Planning/TE for QoS (CoS for insurance)
(cid:127) Metric-Based Offline TE for Control
TE Beyond MPLS Tutorial Apricot 2004 2
Goals
(cid:127) Investigate Assumptions Behind Models
– Dynamic
(cid:127) Internet traffic is highly variable and bursty.
– Simple
(cid:127) Capital expenditures not significant.
– Controlled
(cid:127) Shortest path first protocols do not provide enough
levers of control.
– Simple++
(cid:127) Smart Network Engineering vs. Smart Networks
(cid:127) Demonstrate Simple++
TE Beyond MPLS Tutorial Apricot 2004 3
Summary
(cid:127) Traffic Characteristics
– Long term is smooth and predictable
– Uncorrelated microbursts
– High utilization with little delay at high capacities
– Little need for dynamic routing or queue management
(cid:127) Simple++
– Traffic Matrix (Measure, or Estimate)
– Capacity plan based on failure simulation
– TE without Layer 2 Overlay
(cid:127) Computer-Aided Metric-Based TE ≈ as Efficient of
Theoretical Optimum (though more scalable)
(cid:127) Multiple Routes to High Availability
– Fast Reroute
– Fast Convergence
TE Beyond MPLS Tutorial Apricot 2004 4
MPLS TE Aspects
(cid:127) Covered Here
– Efficient Use of Assets
– QoS
– Fast Reroute
(cid:127) Not Covered Here
(less backbone relevance)
– Admission Control
– Route Pinning
TE Beyond MPLS Tutorial Apricot 2004 5
What is Covered
Core IP / MPLS Network
Low Loss/Latency/Jitter
High
Availability
Diffserv IP Traffic
NSF/
FRR
Engineering SSO
Fast IGP
BGP
Convergence
Ad Hoc
IGP Metric-
Security
Based TE
MPLS TE
TE Beyond MPLS Tutorial Apricot 2004 6
Agenda
I. Traffic Characterization
II. Traffic Matrices
III. TE Introduction
IV. Metric-Based TE
V. Convergence
TE Beyond MPLS Tutorial Apricot 2004 7
Traffic Characterization
I. Traffic Characterization
(cid:127) Long Term
(minutes +)
II. Traffic Matrices
(cid:127) Short Term
(milliseconds)
III. TE Introduction
IV. Metric-Based TE
V. Convergence
TE Beyond MPLS Tutorial Apricot 2004 8
Traffic Characterization
(cid:127) Long-Term
100%
– Measured Traffic
micro-bursts
(cid:127) E.g. P95 (day/week)
– Accommodate failure
failure & growth
and growth
(cid:127) Short-Term
– Critical scale for queuing
– Determine over-
measured traffic
provisioning factor that
will prevent queue
buildup against micro-
bursts
0%
24 hours
TE Beyond MPLS Tutorial Apricot 2004 9
High- vs. Low-Bandwidth Demands
Cleveland -> Denver Washington D.C. -> Copenhagen
Mean=64Kbps, Max=380Kbps Mean=106Mbps, Max=152Mbps
P95=201Kbps, Std. dev.=66Kbps P95=144Mbps, Std. dev=30Mbps
TE Beyond MPLS Tutorial Apricot 2004 10