CCNP Wireless CUWSS 642-732 Summary Notes 18 : Hardware for the RF Network

Posted on Updated on


Designing the RF network

Define the APs and WLC requirements

AP Density

This depends on:

  • Application requirements
    • Data Networks (web browsing)
      • 15 to 25 users per AP
        • 802.11b users reduce a 802.11g AP throughput dramatically. The 802.11b client still has a maximum data rate of 11 Mb/s per second and a maximum throughput of 7.1 Mb/s.
      • Data requires 15 to 20 % overlap
      • For an application such as bar code reading, the number of users can increase considerably and this may require using IEEE 802.11g to increase data rates.
    • Location based services
      • To avoid co channel interference due to dense deployment, the APs at the edge should be set to monitor mode (only used for location purposes)
      • inter-access point separation of between 40 to 70 feet.
    • Legacy clients may impact the network and should be taken into account
      • Take into consideration protection mechanisms
      • Supported channels
      • Supported encr yptions
  • Number of users
  • Data Rate Supported
    • By increasing the access point count and lowering the power, you can improve throughput for users.

Hardware use case APs

  • 1130APs
    • Used Indoors
    • Has internal antennas
    • Used in schools and healthcare facilities
    • With dual 802.11a and 802.11g radios, the access point provides up to 108 Mb/s of capacity in a single device.
  • 1140APs
    • similar to 1130
    • has 802.11n
  • 1240APs
    • Ruggedized APs
    • Used in warehouses
    • Support 802.11a/b/g
    • External connectors
    • With dual 802.11a and 802.11g radios, the access point provides up to 108 Mb/s of capacity in a single device.
  • 1250APs
    • Ruggedized APs
    • Used in warehouses
    • has 802.11n
    • Supports 1000 Ethernet which was specifically engineered to support the power, throughput, and 802.11n.
    • needs 18.5Ws2014-11-11 17_21_46-CUWSS v1.0 Student Guide_Vol1.pdf - Adobe Reader

Controllers

  • 5500
    • Supports 12 – 500 APs (12,25,50,100,250,500)
    • Max throughput of 8 Gbps
    • Supports up to 7000 clients
    • Up to 3000 RFIDs
    • Supports up to 100 Concurrent AP upgrades and joins
    • Up to 8, 1 Gbps SFPs that are non PoE
    • Supports up to 18000 APs in a mobility domain
    • Only 1 WLC per physical device
    • Consumes 125 W power
    • Flexible AP count and feature upgrade via licencing
    • Encrypted data link between AP and WLC
  • 4400
    • Falvours: 4402 and 4404
    • 4402: Supports 12,25,50, APs and has 2 GB connections
    • 4404: Supports up to 100 APs, 4 GB connections and used in Medium to large office deployments
    • Max throughput of 4 Gbps
    • Supports up to 5000 clients
    • Supports up to 10 Concurrent AP upgrades and joins
    • Up to 4, 1 Gbps SFPs
    • Supports up to 7200 APs in a mobility domain
    • Only 1 WLC per physical device
    • Consumes 47 W power
    • No Flexible AP count and feature upgrade via licencing
    • No Encrypted data link between AP and WLC
    • WiSm (Wireless Intergrated Services Module)
    • Used in 6500 Catalyst and 7800 routers
    • Supports 300 APs
    • Max throughput of 8 Gbps
    • Supports up to 10000 clients
    • Supports up to 20 Concurrent AP upgrades and joins
    • uses cat6K backplane
    • Supports up to 10800 APs in a mobility domain
    • 2 WLC per physical device
    • Consumes 164 W power
    • Flexible AP count and feature upgrade via licencing
    • Encrypted data link between AP and WLC
    • can be clustered to support up to 3600 APs (12 WiSMs)
  • 2100
    • Flavours – 2106 (6 APs) , 2112 (12 APs) and 2125 (25 APs)(21XX indicates the supported APs)
    • 8 ports, 2 of which can provide power to Cisco access points
    • To avoid co-channel interference in dense deployments, some of the APs can be set to monitor mode
    • Locations that deploys 3 or more APs can utilize RRM ( Radio Resource Manager) that is RF manager for the network. It dynamically manages power and channels for APs.
  • Cisco 2500 Series WLAN Controller
    • Ideal for Enterprise branches and Small and medium sized businesses
    • Supports up to 50 APs
    • Supports up to 500 clients
    • Has 4 GB ports (2 are PoE and can be used to power APs)
  • Cisco Catalyst 6500 Wireless Service Module 2 (WiSM2)
    • Supports up to 500 APs (100,300,500)
    • Up to 10000 WLAN Clients
    • Up to 5000 RFIDs
    • Up 2 5 WiSM blades if switch supports other modules, 7 blades if chassis does not support other modules (also forthe Cisco 7600 Series router)
    • Several chassis can be clustered together (up to 36000 APs in one mobility group)
    • Requires a Supervisor 720 module to support WiSM2
  • Cisco Flex 7500 Series Controller
    • Designed specifically for HREAPs
    • Does not support APs in other modes
    • Suppports up to 2000 HREAPs (250,500,1000,2000)
    • Up to 20000 wireless clientsConnects to the wired network through 2 10 GB ports

WCS

  • OS requirements
    • Windows 2003 SP2 or later or Linux Red Hat 5.0.32 bit or later
  • Highend Server
    • Supports up to 3000 LWAP AP, 1250 Autonomous APs and 750 Controllers
    • Requires at least Intel Xeon 3.16 Quad GHz CPU with 8 GB RAM and 200 GB Hard-drive (80 free)
  • Standard Server
    • Supports up to 2000 LWAP AP, 1000 Autonomous APs and 450 Controllers
    • Requires at least Intel Xeon 3.2 GHz CPU with 4 GB RAM and 80 GB Hard-drive (40 free)
  • Low end Server
    • Supports up to 500 AP, 200 Autonomous APs and 125 Controllers
    • Requires at least Intel 3.06 GHz CPU with 2 GB RAM and 40 GB Hard-drive (30 free)
  • Location Based Services
    • WCS requires a licence to enable location based services depending on the number of tracked clients
    • WCS can track but on demand and only one device at a time
    • RequiresMSE (also needs a licence)
      • MSE 3310
        • tracks 2000 devices simulteneously
        • Supports up to 2000 APs in WiPS ( Wireless Intrusion Prevention System)
      • MSE 3355
        • tracks 18000 devices simulteneously
        • Supports up to 2000 APs in WiPS ( Wireless Intrusion Prevention System)
  • WCS Licence
    • BasedonthenumberofdeployedAPsnown to the WCS
      • Single-server  licence (50,100,500 AP units) with a total of up to 3000 APs per server
      • Multiple server licences (1000, 2500, 10000, 50000 with a total of 50000 APs per WCS)
      • Licences can be:
        • Base Licence
          • Location based on client RSSI from the closest AP
        • Plus Licence
          • Provides real location determined from RSSI read from several APs
          • Provides MSE support
          • Provides HA for WCS feature
        • CAS (Context Aware Services)licences ( 3000, 6000, 12000 devices) for location tracking)
        • WiPS Licence (25,100,500, 2000 APs)
      • MSE  can support WiPS and CAS on sma eappliance
    • Specific cleanair licence is not required
    • Each located interferer consumes a standard CAS slot
    • If you plan on running Spectrum intelligence ( Cisco Spectrum Expert) then a Spectrum intelligence licence is required for collecting information on WCS from Spectrum Expert stations)

Wired Connection requirements

1

Post Deployment

A detailed hardware requirement list should have:

Wireless equipment needed

Supporting infrastructure upgrades

  • RF Validation for the installed wireless network
    • Co channel interference and appropriate channel separation
    • Power levels are consistent with site survey
    • If designing for AP failover or designing to RRM
    • RF Coverage (band by band)
  • Roaming audit
    • Airmagnet can be used in active and also using IPERF
  • Wireless Infrastructure
    • If designing especially globally, verify channel allocation is consistent
    • For 5 GHz band, make sure that the clients support all those UNI bands.Verify that RRM is consistent with what was achieved during survey
  • Application testing
    • Validate all layers 1 through 7

References:

  1. CCNP Wireless  (642-732 CUWSS) Quick Reference Guide by Jerome Henry
  2. IPexpert’s CCNP CUWSS Wireless Voice on Demand (642-731)

 

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s