cisco 7920

http://www.cisco.com/en/US/products/hw/phones/ps379/products_implementation_design_guide_chapter09186a00802a036a.html#wp1043132

Recommended Environment for the Cisco 7920 Wireless IP Phone

Radio Resource Management under Unified Wireless Networks - Cisco Systems

Radio Resource Management under Unified Wireless Networks - Cisco Systems

RRM supports a Maximum of 20 controllers and 1000 APs per RF group.

Radio Resource Management under Unified Wireless Networks - Cisco Systems

Radio Resource Management under Unified Wireless Networks - Cisco Systems

RRM supports a Maximum of 20 controllers and 1000 APs per RF group.

Wireless LAN Controller (WLC) Configuration Best Practices - Cisco Systems

Wireless LAN Controller (WLC) Configuration Best Practices - Cisco Systems

Wireless LAN Security White Paper [Wireless Network Security] - Cisco Systems

Wireless LAN Security White Paper [Wireless Network Security] - Cisco Systems

SSID is used as a logical separator for WLANs.

The authentication process:

1) Client probes on every channel (probe request frame)
2) Access point in range respond with a probe response frame.
3) The client decides which AP is the best for access and sends an authentication request
4) The AP will send an authentication reply
5) After successful authentication, the client will send an association request frame to the access point.
6) The AP will then send an association response
7) The client is now able to pass traffic to the Access Point

Probe Request: Client sends probe request frames on each channel and listens for a response.

Open Authentication: AP will grant any request for authentication.

Shared Key Authentication: Require a static WEP key.

Shared Key Process:
1) The client sends authentication request
2) Access point responds with challenge text
3) Client uses local key to decrypt and reply's with authentication request
4) If AP can decrypt authentication request and retrieve the original text it will respond with a authentication response

MAC Address Authentication = MAC Filtering

MGCP on routers

MGCP on routers -

MGCP for routers works much like a SCCP phone registration. Keep alives are sent all host. If the primary is available the then this is the host that will be registered to. Registration request are sent to this host.

I have seen where this process will hang. From a show ccm the back up will show registered even though the primary is available. No MGCP did not have effect only a reload of the router resolved.

Critical configs for the registration process:

ccm-manager fallback-mgcp - necessary for SRST/H.323
ccm-manager redundant-host X.X.X.X - Backup server
ccm-manager mgcp
ccm-manager config server X.X.X.X - Note this location for tftp download (config)
ccm-manager config - MGCP download configuration