IGP%20Data%20Plane%20Convergence%20Benchmarking%20%20draft-ietf-bmwg-igp-dataplane-conv-app-01.txt%20draft-ietf-bmwg-igp-dataplane-conv-term-01.txt%20draft%20-ietf-bmwg-igp-dataplane-conv-meth-01.txt

1
IGP Data Plane Convergence Benchmarking
draft-ietf-bmwg-igp-dataplane-conv-app-01.txt
draft-ietf-bmwg-igp-dataplane-conv-term-01.txt
draft -ietf-bmwg-igp-dataplane-conv-meth-01.txt

• Authors
• Scott Poretsky, Quarry Technologies
• Brent Imhoff, WilTel Communications

58th IETF Meeting Minneapolis
2
Changes for Terminology (01 from 00)New Terms

• Preferred Egress Interface
• Next-Best Egress Interface
• Full Convergence
• Convergence Event
• Convergence Event Instant
• Convergence Recovery Instant
• Restoration Convergence Time
• Packet Sampling Interval

3
Changes for Terminology (01 from 00)Renamed Terms

• Full Convergence Time -gt Rate-Derived Convergence
  Time
• Average Convergence Time -gt Loss-Derived
  Convergence Time
• Route Convergence Event Slope -gt Convergence
  Event Transition
• Route Convergence Recovery Slope -gt Convergence
  Recovery Transition

4
Example Convergence Measurement
Rate-Derived Convergence Time
Packet Sampling Interval
Convergence Event Instant
Convergence Recovery Instant
Convergence Packet Loss
Convergence Recovery Transition
Convergence Event Transition
Convergence Time
5
Changes for Methodology (01 from 00)Test Setup
(section 3)

• Test Topologies (section 3.1)
• Added diagrams for Convergence Due to
• ECMP Member Interface Failure (Figure 3)
• Parallel Link Interface Failure (Figure 4)
• Test Considerations (section 3.2)
• Added recommended Timer values
• Added recommendations for reporting of
  Rate-Derived Convergence Time and Loss-Derived
  Convergence
• Added recommendation for configuration of Packet
  Sampling Interval
• Added recommendation for selection of media
• Reporting Format (section 3.3) - ADDED

6
Changes for Methodology (01 from 00)Test Cases
(section 4)

• Added test cases for
• Convergence Due to ECMP Member Interface Failure
• Convergence Due to Parallel Link Interface
  Failure
• Added steps to every test case to measure
  Restoration Convergence Time
• Restore SONET on Tester's Neighbor Interface
  connected to DUT's Preferred Egress Interface.
• Measure Restoration Convergence Time 2 as DUT
  detects the link up event and converges all IGP
  routes and traffic back to the Preferred Egress
  Interface.
• Reorganized test cases for better flow
• 00 grouped Local Test Cases and Remote Test Cases
  
• 01 groups by Convergence Event

7
Next Steps

• Comments?
• Ready for Last Call for IESG Review?

8
Backup Slides
9
Basic Test Methodology

• Test Procedure
• Offer Load at maximum Forwarding Rate with fixed
  packet size to all destinations in the FIB
• Measure pps received at Tester
• Force a Convergence Event
• Observe loss of traffic forwarding
• Observe recovery to forwarding at line rate
• Calculate Convergence Time

Test Setup
Next-Best Egress Interface
DUT
Preferred Egress Interface
Tester

• Test Configuration
• Tester_1 advertises simulated topology via
  routing protocol(s)
• Tester_2 sends traffic to DUT to all destinations
  in FIB
• DUT has two paths (via Link 1 and Link 2) to
  reach destinations
• DUT by default prefers lower cost path via Link 1
• Convergence Event reroutes traffic to Link 2

NOTE Different test cases Described in draft.
10
Test Cases

• 4.1 Convergence Due to Link Failure
• 4.1.1 Convergence Due to Local Interface
  Failure
• 4.1.2 Convergence Due to Neighbor Interface
  Failure
• 4.1.3 Convergence Due to Remote Interface
  Failure
• 4.2 Convergence Due to PPP Session Failure
• 4.3 Convergence Due to IGP Adjacency Failure
• 4.4 Convergence Due to Route Withdrawal
• 4.5 Convergence Due to Cost Change
• 4.6 Convergence Due to ECMP Member Interface
  Failure
• 4.7 Convergence Due to Parallel Link Interface
  Failure

11
Reporting Format

• Parameter Units
• IGP (ISIS or OSPF)
• Interface Type (GigE, POS, ATM, etc.)
• Packet Size bytes
• IGP Routes number of IGP routes
• Packet Sampling Interval seconds or
  milliseconds
• IGP Timer Values
• SONET Failure Indication Delay seconds or
  milliseconds
• IGP Hello Timer seconds or milliseconds
• IGP Dead-Interval seconds or milliseconds
• LSA Generation Delay seconds or
  milliseconds
• LSA Flood Packet Pacing seconds or
  milliseconds
• LSA Retransmission Packet Pacing seconds or
  milliseconds
• SPF Delay seconds or milliseconds
• Benchmarks
• Rate-Derived Convergence Time seconds or
  milliseconds
• Loss-Derived Convergence Time seconds or
  milliseconds
• Restoration Convergence Time seconds or
  milliseconds

12
Convergence Benchmarks

• Rate-Derived Convergence Time Time to converge
  100 of the traffic to all routes in FIB after a
  Convergence Event
• Loss-Derived Convergence Time (Number of
  Packets Lost)/(Offered Packet Load per Second)
• Use of Benchmarks
• Rate-Derived Convergence Time is preferred
  benchmark when Packet Sampling Interval lt100msec
• Loss-Derived Convergence Time is preferred
  benchmark when Packet Sampling Interval gt100msec
• Both Loss-Derived Convergence Time and
  Rate-Derived Convergence Time should be reported