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A-to-Z design guide for the all-wireless workplace
1.
#ATM15 | A-to-Z Design
Guide for the All-Wireless Workplace Partha Narasimhan, Michael Wong March 2015 @ArubaNetworks
2.
2 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | #nomorephones
3.
3 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Wireless Devices • Wireless Devices – 802.11n / 802.11ac – Wireless NIC driver updates – Roaming behavior – 11r, 11k, 11v capabilities
4.
4 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Wireless Office Requirements Wireless Office Requirements RF High Availability Broadcast Suppression Visibility Aruba Solution Exchange
5.
5 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | RF Considerations • ARM – Channel / TX Power • ClientMatch – Band-Steering – Spectrum Load-Balancing – Sticky Client Moves – Voice Aware – .11v BSS transition • Data Rates – Remove lower rates • Channel Width – 20 / 40 / 80 / 160 MHz
6.
6 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | ASE RF Solution • Task-Oriented Configuration for RF Optimization
7.
7 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | ASE RF Solution • Generated Configuration can be pasted to controller
8.
8#ATM15 | High Availability
/ Redundancy @ArubaNetworks
9.
9 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Transition Content Controller High Availability • Client State Info is shared by a pair of controller • 2048 APs: under a second Client State Sync • ESSID stays up • AP builds a primary tunnel and a standby tunnel • 512 APs: ~9 sec AP Fast Failover • Ensures that AP always have a controller available • LMS / Backup LMS • 512 APs: ~1min 20 sec VRRP @ArubaNetworks
10.
10 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Transition Content Client State Sync 1. Client successfully authenticates and generates Key and PMK-SA (Role, VLAN) 2. Client info are synced between the controller pair 3. AP standby tunnel becomes active upon controller failure 4. Client is deauth and when it reconnects, it performs a 4-way key exchange • Does not require full authentication to radius servers 5. Controller deployed in Active / Active Model @ArubaNetworks Authentication ServersMaster Local LocalX Active GRE Standby GRE Active / Active Deployment
11.
11 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Generated Configuration from ASE
12.
12#ATM15 | Broadcast /
Multicast Controls @ArubaNetworks
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13 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Wireless Requirements • Design Criteria – Mobility • Mobile device don’t disconnect and do not understand VLANs • User are not physically constraint to space – RF coverage • Boundaries are less obvious – Decisions, Decisions • Single VLAN or VLAN Pool? • How large should the broadcast domain be? • L2 Mobility • IP Mobility – IPv6 Clients
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14 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Broadcast Domain • “Controlling broadcast propagation… is important to reduce the amount of overhead” • Wired Network – Broadcast Control with VLAN segmentation – Physically Constraint (per floor) – Finite number of ports
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15 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Problem: WLAN Broadcast Flow • Unicast frames – Unique for each client • Broadcast / Multicast frames – Clients connecting to same BSS (AP) use the same key – Broadcast / multicast traffic is unnecessary flooded Unicast Frame Broadcast / Multicast Frame VLAN
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16 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Problem: Multiple VLANs • Unicast frames – Unique for each client • Broadcast / Multicast frames – Clients connecting to same BSS (AP) use the same key – Clients can see broadcast / multicast from other VLANs Unicast Frame Broadcast / Multicast Frame VLAN 20 VLAN 10
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17 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Transition Content AOS Broadcast / Multicast Control Broadcast / Multicast Controls Enable IGMP snooping / MLD • Learn IGMP membership • Prune multicast flows if there are no subscribers “broadcast-filter all” • Packets allowed if: •Packets originating from the wired side with destination range of 225.0.0.0-239.255.255.255 •A station has subscribed to a multicast group “broadcast-filter arp” • ARP will be flooded on the wired side and sent as 802.11 unicast frame if there is a match in the user table • DHCP converted to unicast • IPv6 NS is treated in a similar fashion Duplicate Address Detection • Gratuitous ARP • IPv6 DAD If DMO is enabled, multicast packets will be sent as 802.11 unicast @ArubaNetworks
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18 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | ARP Packet Flow Example (with broadcast control) • Unicast frames encrypted with PTK – Unique for each client • Broadcast / Multicast frames are not flooded • ARP packet sent only to matching client entry in user table – ARP packet from Client A is sent to Client B as 802.11 unicast – Client C does not get ARP packet Unicast Frame Broadcast / Multicast Frame ARP VLAN Sta A: Who has IP 10.10.10.1? Sta B: IP 10.10.10.1 Sta C:
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19 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Bonjour and SSDP in the Enterprise Enable Airgroup to handle Zero Configuration Networking Multicast (Bonjour and SSDP) large campus without affecting Wi-Fi performance • Well-known address for mDNS is 224.0.0.251 • Well-known address for SSDP is 239.255.255.250
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20 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | VLAN Pooling • When should VLAN pool be used? – Provide additional address space for non-contiguous • Higher chance if public IP address is being used – All VLANs in the pool should be the same size • Controller will automatically convert IPv6 RAs to unicast – Conversion of RAs to unicast is necessary to prevent client from getting address in wrong IPv6 prefix – Unicast traffic may negatively affect battery life
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21 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Summary • Keep it simple, use a single VLAN – The cost of managing broadcast / multicast domain for multiple VLANs is expensive – Use Airgroup to manage Bonjour (AirPlay) and SSDP (Chromecast / DLNA) behavior – Avoid potential client misbehavior • L2 Domain should match a contiguous RF footprint – With Mobility, devices are not constraint to a physical space
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22 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Things to Keep in Mind • Single VLAN can put additional requirements to uplink router – Router should be able to handle large ARP table • DHCP server scalability / redundancy
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23#ATM15 | Visibility @ArubaNetworks
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24 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Voice / UCC Visibility • Real time correlation between Call Quality and Wi-Fi Quality • Lync SDN 2.1 – additional session info provided
25.
25 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | AppRF
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26 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Aruba Solution Exchange (ASE) • Aruba Solution Exchange (ASE) – https://ase.arubanetworks.com • Benefits – Generate dynamic configuration – Reduce time to make use of configuration – Solution validates user input
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27 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | ASE FAQ • Who can access ASE? – Customer, Partners, Airhead Social Users • Is there a cost? – ASE is free • Documentation – https://ase.arubanetworks.com/docs • How can I get notification when a solution is updated? – Follow the solution!
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28 CONFIDENTIAL ©
Copyright 2015. Aruba Networks, Inc. All rights reserved#ATM15 | Sign up, save $200! arubanetworks.com/atmosphere2016 Give feedback! … Before You Go atmosphere 2016
29.
29#ATM15 | @ArubaNetworks
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THANK YOU 30#ATM15 |
@ArubaNetworks
Notes de l'éditeur
Make networks mobility-defined instead of fixed
Make networks mobility-defined instead of fixed
Make networks mobility-defined instead of fixed
Make networks mobility-defined instead of fixed
Make networks mobility-defined instead of fixed
Make networks mobility-defined instead of fixed
Make networks mobility-defined instead of fixed
Make networks mobility-defined instead of fixed
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