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Cisco 7921-7925 Deployment Guide v2

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					WINSTM: Wireless Interoperability & Network Solutions
                  Cisco 7921-7925
             Deployment Guide 1.1




                                   MERUNETWORKS.COM
                                                                               Cisco 7921-7925 Deployment Guide




Executive Summary....................................................................... 1
Required Hardware and Software ..................................................... 1
Dashboard Summary View (Quick reference guide) .............................. 2
Network Configuration ................................................................... 3
Cisco Wireless VoIP Phone Configuration .......................................... 4
 Configure Cisco 7921/7925 Wireless Phones .................................................. 4
 7921/7925 Buttons and Keys....................................................................... 4
 Access the Phone Setup............................................................................ 7
 Configure a Profile Name ........................................................................... 8
 Configure the Phone’s IP Settings ............................................................... 9
 Configure a WLAN for the Phone ................................................................10
Configure the Meru System ........................................................... 11
 Configure a VLAN ...................................................................................11
 Configure a Security Profile.......................................................................12
 Configure an ESS Profile ..........................................................................14
 Configure a QoS Rule ..............................................................................16
Deployment Guidelines ................................................................ 19
Post Configuration and Deployment................................................ 19
 Connection to the Wireless LAN .................................................................19
 Registration with Cisco Call Manager ..........................................................19
 Making Calls ..........................................................................................19
 Monitoring MOS for Debug........................................................................20
Recommendations ...................................................................... 20
 Recommended Settings for Cisco 7921/7925 Phones ......................................20
 Recommended Settings for Meru Controller..................................................21
 Meru Feature Recommendations ................................................................21
References ................................................................................ 21




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Executive Summary
The Cisco Wireless IP Phone provides effective mobile communication within an enterprise by extending
advanced voice and unified communications capabilities across the enterprise through Cisco Unified
Communication Manager. When deployed with Meru Networks’ Wireless LAN, it enables users to stay in touch
while roaming seamlessly throughout their facility—even in environments covering millions of square feet, multiple
buildings, and environmentally challenging structures.

This guide outlines the necessary configuration steps to configure the Meru Networks WLAN controller and
access points along with the Cisco 7921 and Cisco 7925 phones. This guide also provides voice deployment
guidelines for mixed 802.11 a/b/g/n Meru Networks infrastructure deployments.




Required Hardware and Software
Meru Networks Products
    • Controllers: MC1000, MC1500, MC3000, MC4100, MC5000
    • System Director Software: 4.0-106 and later

Cisco Products
    • Cisco 7921: 1.3.3
    • Cisco 7925: 1.3.3 and 1.3.4
    • Cisco Unified Communication Manager (Call Manager): 7.1




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Dashboard Summary View (Quick reference guide)


                                            Cisco
                          HW          7921/7925
                          FW          1.3.3, 1.3.4
                          Call
                          Manager     7.1

                                            Meru
                          SW          SD 4.0-105 and later

                                         AP200                             AP300
                               VC                NVC                 VC              NVC

 QoS
 Auto                       No                  No                  No               No
 Manual                   DSCP cs7            DSCP cs7            DSCP cs7         DSCP cs7

 Power Save
 WMM-PS (uAPSD)                Yes               Yes                Yes               Yes
 PS-Poll                       Yes               Yes                No                Yes

 ESS
 DTIM                           2                    2                2                2
 Base Rate
 Lowest recommended       11/12Mbps          11/12Mbps            11/12Mbps       11/12Mbps
 Silent Client Polling     Enabled            Enabled              Enabled         Enabled




 Battery Life
 Talk Time                     3h                    -               3h                3h
 Talk Time (Power Save)        7h                    -               7h                7h

                          Ready to deploy (works with defaults)
                          Can be deployed (if defaults changed)
                          Do not deploy




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Network Configuration
The network diagram in Figure 1 depicts the typical components in a Cisco wireless VoIP and Meru Networks
WLAN system deployment. For a typical enterprise deployment, we recommend configuring one ESSID for the
Cisco wireless VoIP phones on a voice VLAN.

Notes: In this diagram, the Cisco Catalyst 3750 series is the Ethernet switch. The MC3000 controller is in the
same VLAN as the Cisco Call Manager.




                     Figure 1: Typical Meru/Cisco Wireless VoIP Network Topology Diagram



The network diagram shown above is a good illustration of the how the Cisco wireless VoIP phones are set up to
interoperate with the Meru Networks infrastructure.




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Cisco Wireless VoIP Phone Configuration
The Cisco wireless VoIP system configuration consists of two portions: the Cisco Call Manager configuration and
Cisco 7921/7925 phone configuration. It is assumed that the Cisco Call Manager is already configured, set up and
running. Configuration settings for Cisco Call Manager is beyond the scope if this document. Please refer to Cisco
documentation for any Call Manager configurations.

In the next section, configuration recommendations are described for Cisco Wireless VoIP phones 7921 and
7925. The 7921 and 7925 are essentially the same wireless phones from a WLAN perspective. They share most
of the same hardware except that the 7925 supports Bluetooth 2.0, features an internal antennas and is a little bit
more ruggedized for industrial applications.

Configure Cisco 7921/7925 Wireless Phones
The Cisco 7921/7925 phones are capable of operating in both 2.4 GHz and 5 GHz bands. This allows the phones
to be deployed in a wide range of channels. The Cisco 7921/7925 uses Skinny Client Configuration Protocol (or
SCCP) which is proprietary to Cisco. The following sections describe a step-by-step configuration of the Cisco
7921/7925 phones.


 Note: The Cisco 7921 and 7925 uses the same display and has the same GUI interface to access and configure the
 phones. The setting that is used to access 7921 also applies to 7925.




7921/7925 Buttons and Keys
The figures below illustrate both the 7921 and 7925 phones. This will help in identifying the buttons used to
configure the phones




                   Figure 2: Cisco 7921                                Figure 3: Cisco 7925




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Access the Phone Setup
Use the Navigation button to access the Settings in the 7921/7925 phones. A screenshot of the Settings menu is
shown below




                              Figure 4. Screenshot - Accessing Phone Settings




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Configure a Profile Name

The steps below describe how to configure a Network profile name:
   1. Access Settings menu
   2. Select Network Profiles
   3. Select one of the four available profiles
   4. Select Change (By default the settings are locked. Enter *, *, # sequentially to unlock all
   5. settings.)
   6. From within the selected network profile select Profile Name
   7. Enter the profile name
   8. From the Options button select Save. (Shown in the image below)
   9. Enable the Network profile by highlighting it and pressing the Select button. (The profile is
      selected/enabled when a check appears next to it.)




                           Figure 5. Screenshot – Entering Profile Name on Handset




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Configure the Phone’s IP Settings
The following steps are used to configure the phoneʼs IP settings.

 Note: Care should be taken while configuring the IP Settings, as an IP mismatch will cause issues with the phones
 being unable to connect to the Cisco Call Manager.



          1. Access Settings menu.
          2. Select Network Profiles.
          3. Select one of the four available profiles.
          4. Select Change (By default the settings are locked. Enter *, *, # sequentially to unlock all settings.)
          5. From within the selected network profile select Network Configuration.
          6. Configure DHCP as on or off from within this menu.
          7. If DHCP is off, configure a host IP address, subnet mask and default router from within this menu.
          8. Configure the host IP address by selecting the IP Address option and entering an IP address.
          9. Before exiting the IP address menu press the Options button and select Validate.
          10. Configure the subnet mask address by selecting the Subnet Mask option and entering a valid
              subnet mask.
          11. Before exiting the Subnet Mask menu press the Options button and select Validate.
          12. Configure a default router by selecting the Default Router 1 option and entering the IP address of
              the default router.
          13. Before exiting the Default Router menu press the Options button and select Validate.
          14. Set the Alternate TFTP to Yes (The TFTP server is the Cisco Call Manager)
          15. Configure the TFTP Server 1 to the address of the Cisco Call Manager. (Shown in the image
              below.)
          16. Before exiting the TFTP Server menu press the Options button and select Validate.
          17. Press the Save button to save your configuration changes and to return to the main Settings menu.




                           Figure 5. Screenshot – Entering Configuration on Handset




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Configure a WLAN for the Phone
Follow these steps to configure a WLAN profile name:
         1. Access the Settings menu.
         2. Select Network Profiles.
         3. Select one of the four profiles that was created earlier
         4. Select Change (You are notified that the settings are locked. Enter *, *, # sequentially to unlock all
            settings.)
         5. From within the selected network profile select WLAN Configuration.
         6. From within the WLAN Configuration select SSID.
         7. Enter the SSID name.
         8. Save the setting and exit the menu using the Options button.
         9. From within the WLAN Configuration, select Call Power Save Mode.


   Note: When U-APSD/PS-Poll is selected, please make sure that the U-APDSD feature is enabled in the ESS Profiles


         10. Select None or U-APSD/PS-Poll.
         11. Save the setting and Exit the menu.
         12. From within the WLAN Configuration select Security Mode.
         13. Select Auto (AKM) WPA2PSK security. There are other options that can be selected according to
             the deployment requirements
         14. Save the setting and Exit the menu.
         15. From within the WLAN Configuration select Pre-shared Key.
         16. Enter the pre-shared key. Pre-shared key should match the one that is set in the Infrastructure.
         17. Save the setting and Exit the menu using the Options button.

The phone is now ready and configured. It should now be able to connect/authenticate to a WLAN and register
with the Cisco Call Manager.




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Configure the Meru System
The following sections describe how to configure the Meru system for a basic deployment. Refer to the System
Director User Guide and Command Reference Guide for further information.

Cisco Wireless LAN VoIP phones can be deployed in a Meru Networks WLAN infrastructure where the access
points are deployed within a subnet or across multiple layer 3 subnets. When deploying the system, you should
determine which types of devices will require access and the mechanism of authentication/encryption that they
support. During configuration of the Meru Networks system, different parameters are configured as described in
the following sections:

•   Configure VLAN for Cisco phones
•   Configure a Security Profile
•   Configure an ESS Profile
•   Configure a QoS Rule


Note: The configuration segments documented can be entered from the CLI or GUI. Refer to the System
Director user guide and command reference for further clarification.
.

Configure a VLAN
It is recommended to separate the voice and data traffic onto different VLAN’s. Below is an example configuration
for a Cisco phones-only VLAN. VLANs for other devices should be configured to provide the necessary
separation
      MC1000# configure terminal
      MC1000(config)#vlan Cisco_Voice tag 117
      MC1000(config-vlan)# interface FastEthernet controller 1
      MC1000(config-vlan)# ip address 172.26.96.2 255.255.240.0
      MC1000(config-vlan)# ip default-gateway 172.26.96.1
      MC1000(config-vlan)# ip dhcp-server 0.0.0.0
      MC1000(config-vlan)# ip dhcp-passthrough
      MC1000(config-vlan)# no ip dhcp-override
      MC1000(config-vlan)# exit
      MC1000(config)# exit




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The screen shot to configure the VLAN using the GUI is shown below. One can access the VLAN creation under
the configuration menu

Configuration >Wired>VLAN>Add tab




                          Figure 7. Screenshot – Configuring the VLAN on Meru Controller


Configure a Security Profile
                                                        TM
A Meru/Cisco deployment leveraging the Meru Virtual Cell (V-cell) technology allows for the deployment of any of the below
security mechanisms without any roaming or handoff penalty.
    • Open
    • WEP (64 or 128)
    • WPAPSK/ WPA-PEAP
    • WPA2PSK / WPA2-PEAP
    • LEAP




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The security profile configured in this example is WPA2PSK. This can be changed using either the CLI or GUI.
Configure the security profile using the CLI as shown below:
MC1000# configure terminal
MC1000(config)# security-profile wpa2-psk
MC1000(config-security)# allowed-l2-modes wpa2-psk
MC1000(config-security)# encryption-modes ccmp
MC1000(config-security)# psk key meru2002
MC1000(config-security)# exit
MC1000(config)# exit


To configure the security profile using the GUI, select the Configuration option of the controller main page then
select the Profile option under Security. Under the Profile option, the Add button at the bottom will create a new
profile.
Configuration > Security > Profile > Add tab




                                Figure 8. Configuring Security on Meru Controller
In the above screen, the L2 Mode allowed is set to WPA2PSK and Data Encrypt is set to AES-CCMP. The Pre-
Shared Key field has been completed with the same key programmed into the Cisco phones.




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Configure an ESS Profile
Once the security profile is configured, configure the ESSID. The ESS Profile can be configured using the CLI or
the GUI.
Configure the ESS Profile using CLI as shown below:
       MC1000# configure terminal
       MC1000(config)# essid Cisco
       MC1000(config-essid)# security-profile wpa2-psk
       MC1000(config-essid)# multicast-enable
       MC1000(config-essid)# dataplane tunneled
       MC1000(config-essid)# ssid demo4
       MC1000(config-essid)# tunnel-type configured-vlan-only
       MC1000(config-essid)# vlan name Cisco_Voice
       MC1000(config-essid)# ap-discovery join-ess
       MC1000(config-essid)# beacon dtim-period 2
       MC1000(config-essid)# beacon period 100
       MC1000(config-essid)# wmm-support
       MC1000(config-essid)# apsd-support
       MC1000(config-essid)# exit
       MC1000(config)# exit
      MC1000#




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The ESS Profile can also be configured using the GUI. Select the Configuration option of the controller main
page, then select the ESS option under Wireless. Under the ESS option, the Add button at the bottom will create
a new profile.

 Note: For Cisco 7921/7925 phones, it is recommended to set the DTIM Period to 2. It is highly recommended to enable
 UAPSD for the ESS Profile supporting Cisco Phones. This improves talk time and WMM improves voice quality



Configuration > Security > ESS > Add tab




                           Figure 9. Screenshot – Configuring ESS on Meru Controller




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Configure a QoS Rule
When Cisco 7921/7925 phones are operating in the Meru Networks infrastructure, it is recommended to add
subnet-based QoS in order to get a good voice quality.

Note: The 7921/7925 handsets will tag data frames as Expedited Forwarding (EF) by default. The binary
value of EF is 101110 (46 decimal). Meru system looks at ToS values, which are the three leftmost bits.
Therefore, our system sees the frames tagged as 101 or 5 decimal. This results in those frames hitting the
AC_VI queue, which leads to suboptimal voice quality. With custom QoS rules for the 7921g handset, like
the ones provided here, you ensure that voice frames hit AC_VO of the AP300.


The QoS rule can be configured using either the GUI or CLI.
The CLI method to configure the rule is shown below. Two different QoS rules are required. One to match the
source IP based for the subnet and the other for the destination IP for the subnet.

      MC1000(config)# qosrule 1001 netprotocol 17 qosprotocol other
      MC1000(config-qosrule)#   netprotocol-match on
      MC1000(config-qosrule)#   dstip 172.26.16.0
      MC1000(config-qosrule)#   dstmask 255.255.240.0
      MC1000(config-qosrule)#   dst-ip match on
      MC1000(config-qosrule)#   action forward
      MC1000(config-qosrule)#   droppolicy head
      MC1000(config-qosrule)#   priority 0
      MC1000(config-qosrule)#   dscp cs7
      MC1000(config-qosrule)#   exit
      MC1000(config)# qosrule 1002 netprotocol 17 qosprotocol other
      MC1000(config-qosrule)#   netprotocol-match on
      MC1000(config-qosrule)#   srcip 172.26.16.0
      MC1000(config-qosrule)#   srcmask 255.255.240.0
      MC1000(config-qosrule)#   src-ip match on
      MC1000(config-qosrule)#   action forward
      MC1000(config-qosrule)#   droppolicy head
      MC1000(config-qosrule)#   priority 0
      MC1000(config-qosrule)#   dscp cs7
      MC1000(config-qosrule)#   exit
      MC1000(config)#




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                                                                                       Cisco 7921-7925 Deployment Guide


The QoS rule can also be configured using the GUI. This screen can be seen by selecting the Configuration
option of the controller main page, then selecting the System Settings option under QoS. Under the ESS option,
the Add button at the bottom will create a new profile. The screenshot below shows all QoS rules available on the
Meru system by default. QoS rules 1001 and 1002 are used for in this example to prioritize Cisco phone packets.

 Note: For Cisco 7921/7925 phones, the Voice packets go out as UDP packets (Net Protocol 17), so it is recommended
 to prioritize just the UDP packets to go into the higher priority queue


Configuration > QOS > System Settings > QOS and Firewall tab > Add Button.




                 Figure 10. Screenshot – Configuring QoS Rule (Destination) on Meru Controller




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                                                            Cisco 7921-7925 Deployment Guide




Figure 11. Screenshot – Configuring QoS Rule (Source) on Meru Controller




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Deployment Guidelines
                                        TM
The Meru Networks Air Traffic Control system supports two modes of deployment: Virtual Cell and non-Virtual
Cell. In Virtual Cell, all of the access points on the same channel will utilize a single BSSID. This allows the
system to perform client handoffs between access points without the client devices needing to perform 802.11 re-
association or 802.1X re-authentication procedures to the new access point. In non-Vcell mode, all of the access
points are in one channel, but broadcast their own BSSID.

For a typical deployment, Meru Networks recommends configuring one ESSID for the voice devices on a voice
VLAN.

For tablet and laptop PC’s, another ESSID should be configured utilizing strong authentication/encryption such as
WPA interfacing to a RADIUS server and this traffic should be separated onto a secure VLAN.

If guest access is desired, then another ESSID should be configured utilizing captive portal service for web-based
authentication. This traffic should be placed on a VLAN that terminates outside the infrastructure firewall.

The Cisco 7921/7925 phones are recommended to be deployed in a Meru Networks WLAN system with
AP200/AP300 access points with Virtual Cell enabled. It is recommended that the Cisco phones be deployed in
the 5 GHz band. One method to achieve this is to use band steering (available in Meru System Director 4.0 and
above.)



Post Configuration and Deployment
Once all the settings in both the Meru infrastructure and Cisco phones are configured and ready for deployment,
the phone should now be able to connect/authenticate to a WLAN and register with the Cisco Call Manager. The
following topics will indicate the proper functioning of the Cisco wireless phones in the Meru Networks
infrastructure.

Connection to the Wireless LAN
There is a WLAN connection indicator in the upper left hand corner of the phones main screen (next to the battery
icon). The connection indicator is an antenna icon. It is solid green with green signal strength indicators next to it if
the phone is associated to a WLAN.

Registration with Cisco Call Manager
Shortly after the phone associates to a WLAN, it attempts to register with Cisco Call Manager. Once registration
is successful, the main screen of the phone displays the handset’s extension number, date and time, as well as
“Cisco Unified CME”.

Making Calls
To make a call, enter the extension of the handset you are trying to reach and then press the green
Answer/Send button.




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Monitoring MOS for Debug
One of the more useful features of the 7921G/7925 phones is their ability to calculate and display an estimated
MOS for over the air traffic. This can be used as a good test/debug tool.
To access the Call Statistics screen follow the steps below.
        1. From the main menu, click the tool box icon to access the Settings menu.
        2. From inside the Settings menu select Status.
        3. From the Status menu, select Call Statistics.
        4. Once the statistics are shown, scroll down to see the estimated MOS.




                              Figure 12. Screenshot – Viewing MOS Score on Handset


 Note: Typically any MOS or Mean Opinion Score over 4.0 is considered to be toll quality



Recommendations
Recommended Settings for Cisco 7921/7925 Phones


 Sl.No                   Items                               Recommendations



 1.      Security                                 WPA2PSK



 2.      IP Settings                              DHCP



 3.      UAPSD                                    Enable


                                                   ‘5.0’ GHz band is preferred
 4.      Band




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Recommended Settings for Meru Controller


     Sl.No                      Items                                      Recommendations



                                                             a. Virtual Cell Mode: Virtual Port mode (Default)
 1.          ESSID:                                          b. Beacon interval = 100ms
                                                             c. Recommended DTIM value = 2
                                                             d. Channel – 1, 6, 11 – Virtual Port.
                                                             e. SSID Broadcast = ON
                                                             f. UAPSD – ON.
                                                             g. Multicast: ON



 2.          Security Profile                                WPA2PSK



 3.          VLAN                                            Separate VLAN for Voice and Data



 4.          Load Balancing                                  If required to load balance the clients across
                                                             channels.



Meru Feature Recommendations

1. Virtual Cell (Default): For Cisco 7921/7925 phone deployments, Meru APs should be configured in V-cell
mode. The Meru V-cell technology allows for zero-handoff as the handsets roam through the wireless coverage
area. This dramatically helps improve the quality and consistency of client roam times and thus along with the bi-
directional QoS provides a toll-quality call experience regardless of the handset’s security context. To maintain
the benefits of V-cell and to maximize call quality, it is recommended to use Virtual Cell.

2. VLAN Support: It is recommended to separate the voice and data traffic onto different VLAN’s.

3. Silent client polling is enabled by default in the system for the AP300 access point in 3.6.1 builds (ON or OFF
in the ESSID has no effect on the AP300). Silent client polling ensures that the client sends ACK frames for NULL
or QoS NULL frames sent post TIM bit indication in the beacon. Meru system uses the ACK packets received
from station by default to fill in RSSI values into frame reports sent to the controller; as a result, these frame
reports will enable roaming, even for silent clients.


References
1.    Cisco Unified IP Phone 7925G (SCCP) for Cisco Unified Communications Manager Express 7.0
2.    Cisco Unified Wireless IP Phone 7921G Guide for Cisco Unified Call Manager 4.1, 4.2, 5.0 and Later
3.    Cisco Unified Communications Manager documentation
4.    Meru System Director Users Guide




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