Optimizing wlan operations peter lane
Upcoming SlideShare
Loading in...5
×

Like this? Share it with your network

Share
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
2,068
On Slideshare
1,906
From Embeds
162
Number of Embeds
2

Actions

Shares
Downloads
193
Comments
0
Likes
0

Embeds 162

http://community.arubanetworks.com 158
http://www.airheads.eu 4

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 1 #airheadsconf#airheadsconf Optimizing WLANs Peter Lane March 14, 2013
  • 2. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 2 #airheadsconf Inventory your network Monitor the health of your network Alert on critical issues Optimize RF Optimize Applications Agenda
  • 3. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 3 #airheadsconf •  Voice/video optimization •  High Density/Large Public Venue •  Outdoor •  Advanced RF troubleshooting Topics not covered
  • 4. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 4 #airheadsconf •  APs –  Single radio or dual radio –  a/b/g, 2 stream 11n, 3 stream 11n •  Switches –  AP uplink speed –  Switch uplink speed •  Applications –  Voice –  Video –  Cloud based (Salesforce, Box, Hulu, YouTube, etc.) –  Gaming –  File sharing Routinely Inventory your network
  • 5. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 5 #airheadsconf •  Clients –  Types –  Densities –  Locations •  Physical locations –  Odd construction materials –  Old buildings –  Sources of Interference Routinely Inventory your network
  • 6. 6 6 CONFIDENTIAL © Copyright 2012. Aruba Networks, Inc. All rights reserved ArubaOS Dashboard - Performance Noise Floor Channel Utilization Interference SNR
  • 7. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 7 #airheadsconf AOS RF Dashboard – Security
  • 8. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 8 #airheadsconf AOS RF Dashboard – WLAN
  • 9. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 9 #airheadsconf AOS RF Dashboard – Access Points
  • 10. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 10 #airheadsconf AirWave – AP Monitoring
  • 11. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 11 #airheadsconf Radio Details
  • 12. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 12 #airheadsconf AppRF AirWave Screenshots
  • 13. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 13 #airheadsconf •  Prioritize cloud based Applications –  Create a stateful firewall destination –  Add a policy using that destination to prioritize –  Pause ARM scanning for extremely latency sensitive or UDP heavy applications (not common) Controller ACLs and policy updates
  • 14. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 14 #airheadsconf •  Limit the bandwidth per user/role •  Limit the bandwidth used per VAP. Bandwidth contracts and Traffic shaping
  • 15. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 15 #airheadsconf#airheadsconf Use Reports to identify trends over time
  • 16. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 16 #airheadsconf RF Health
  • 17. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 17 #airheadsconf Rogue Client Connections •  Don’t get blamed for other networks performance •  Identify clients that are misconfigured •  Identify underserved locations
  • 18. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 18 #airheadsconf Capacity planning
  • 19. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 19 #airheadsconf#airheadsconf Use alerts to reduce work and gain visibility
  • 20. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 20 #airheadsconf Channel Utilization •  Why is the Radio low on air time? –  Special event –  Other APs down –  Change in user behavior –  Lots of multicast •  Frequent occurrence? –  Add APs –  Upgrade APs –  Implement bandwidth contracts –  AirGroup
  • 21. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 21 #airheadsconf •  >-85 is a concern –  Look at the SNR of associated clients to determine impact •  Look at nearby APs –  Is it an area wide problem or restricted to a single AP? Noise Floor monitoring
  • 22. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 22 #airheadsconf Radius Auth Issues •  Find Auth issues before clients report them –  Restrict to Device or user –  Tweak levels for your environment –  Verify RADIUS server performance and config if problems are seen
  • 23. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 23 #airheadsconf IDS Events can cause client disruption •  Some attacks simply disrupt the network –  Very rare –  Not an issue if only seen once –  Repeated detections imply someone is causing network problems –  Don’t waste time looking for other problems when this one is purposely created
  • 24. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 24 #airheadsconf Interface Usage Monitoring •  A saturated uplink leads to slow wireless performance
  • 25. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 25 #airheadsconf Device Event Monitoring •  Catchall Alert –  Temp –  Fan speed –  Crash –  Etc.
  • 26. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 26 #airheadsconf •  Sticky clients –  Station handoff assist –  Lower TX power levels •  Interference –  Non-wifi interference immunity (use with caution) –  Channel Reuse and Cell size reduction –  Lower TX power levels –  ARM channel changes –  Replace microwaves •  Old clients –  Match AP min/max TX power to +- 3 db of client Common Problems
  • 27. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 27 #airheadsconf Standard recommendations from VRD Feature Setting Profile ARM Assignment Single band (default) Multiband (for single-radio APs) ARM Client-Aware ARM Enabled ARM Voice-Aware Scanning Enabled ARM Video-Aware Scanning Enabled ARM Load-Aware Scanning 10 Mb/s (default) ARM Power-Save-Aware Scanning Disabled ARM Rogue-Aware Scanning Disabled except for high security environments ARM Band Steering Enabled, prefer 5 GHz (default) VAP Adjusting Receive Sensitivity Disabled Radio Station Handoff Assist Disabled RF Optimization Intelligent Rate Adaptation Always on, not configurable N/A Fair Access Enabled Radio
  • 28. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 28 #airheadsconf Deployment specific settings from the VRD Feature Sparse AP with Data Only Dense AP with Data Only When Enabling Video When Enabling Voice Spectrum Load Balancing Disabled Enabled Enabled Disabled Mode-Aware ARM Disabled Disabled Disabled Enable only to solve client issues Local Probe Request Threshold Disabled Enabled (value = 25 dB) Enabled (value = 25 dB) Enabled (value = 25 dB) Dynamic Multicast Optimization Disabled Disabled Enabled – higher of 40 or 3 x number of VLANs Disabled
  • 29. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 29 #airheadsconf •  Know your network –  How is it used –  Where is it used •  Monitor the health of your network –  RF health of the APs –  Client health –  Authentication issues •  Alert on critical issues –  Leverage tools to get notified about issues Keep Optimizing
  • 30. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 30 #airheadsconf#airheadsconf Thank You
  • 31. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 31 #airheadsconf#airheadsconf31
  • 32. 32 32 CONFIDENTIAL © Copyright 2012. Aruba Networks, Inc. All rights reserved Essential Elements of Healthy RF Signal Strength Good Noise Floor Channel Utilization Client NIC Low Interference
  • 33. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 33 #airheadsconf •  AP Characteristics –  Number and type of Radios (a/b/g/n) –  Max Tx Power –  Receive Sensitivity –  Number of Spatial Streams –  Antenna – Internal/External –  Antenna Pattern –  Number of clients supported What Affects Signal Strength? APs are not created equal Choose the right AP for the occasion
  • 34. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 34 #airheadsconf AP-135 Antenna Pattern
  • 35. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 35 #airheadsconf AP-93 Antenna Pattern
  • 36. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 36 #airheadsconf AP Radiated Power (EIRP) What Affects Signal Strength? = Radio Transmit Power (dBm) + Transmit Antenna Gain (dBi) •  AP Regulatory Domain •  Country Code •  Radio Band (2.4GHz/5GHz) •  Channel (different channel has different allowed Max EIRP) Antenna is PASSIVE – Does Not ADD energy Higher Gain just means energy more focused Not always a good thing
  • 37. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 37 #airheadsconf •  Attenuation (Path Loss) –  Distance from AP/Line-of-sight –  Building materials (walls, windows, partitions) –  Furniture –  People What Affects Signal Strength? Client Received Power (dBm) = Radiated Power/EIRP (dBm) - Path Loss (dB) + Receiver Antenna Gain (dBi)
  • 38. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 38 #airheadsconf Attenuation of Common Building Material 2.4GHz 5.0GHz Fabric, blinds, ceiling tiles ~1dB ~1.5dB Interior drywall 3-4 dB 3-5 dB Cubicle wall 2-5 dB 4-9 dB Wood door (Hollow – Solid) 3-4 dB 6-7 dB Brick/Concrete wall 6-18 dB 10-30 dB Glass/Window (not tinted) 2-3 dB 6-8 dB Double-pane coated glass 13 dB 20 dB Steel/Fire exit door 13-19 dB 25-32 dB
  • 39. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 39 #airheadsconf •  Disable Bcast if possible •  AirGroup when possible –  Management frames –  Lowest data rates –  Large subnets bring in large bcast domains •  SSID profile –  Bcast/mcast on the SSID •  Set to ARP Broadcast Optimization
  • 40. CONFIDENTIAL © Copyright 2013. Aruba Networks, Inc. All rights reserved 40 #airheadsconf •  Watch out for DHCP lease issues •  Short leases recommended depending on usage –  30-60 min for guest networks –  6 to 8 hours for .1x DHCP