Cisco Cisco Aironet 1600i Access Point Manual Técnica
devices used in this document started with a cleared (default) configuration. If your network is live, make sure
that you understand the potential impact of any command.
that you understand the potential impact of any command.
Background Information
A WGB can provide a wireless infrastructure connection for Ethernet−enabled devices. Devices that do not
have a wireless client adapter in order to connect to the wireless network can be connected to the WGB
through the Ethernet port. The WGB connects up to eight Ethernet−enabled devices to a Wireless LAN
(WLAN). The WGB associates to the root AP through the wireless interface. In this way, wired clients obtain
access to the wireless network. A WGB can associate to:
have a wireless client adapter in order to connect to the wireless network can be connected to the WGB
through the Ethernet port. The WGB connects up to eight Ethernet−enabled devices to a Wireless LAN
(WLAN). The WGB associates to the root AP through the wireless interface. In this way, wired clients obtain
access to the wireless network. A WGB can associate to:
An AP
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A bridge (in AP mode)
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A controller through a lightweight AP
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An AP in repeater mode (if the repeater is associated with a root AP)
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In WGB mode, the unit associates to another AP as a client. The unit provides a network connection for the
devices that are connected to its Ethernet port. Some of the typical usage scenarios for a WGB are:
devices that are connected to its Ethernet port. Some of the typical usage scenarios for a WGB are:
A single printer connected to WGB
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A network extension for multiple devices that are physically separated from the main network
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In the manufacturing sector where it is not feasible to deploy wires and there is a requirement for less
roaming and high reliability
roaming and high reliability
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On vehicles such as buses and trains in order to provide uplink access
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The WGB associates to an AP on the network. An AP in WGB mode can associate only to an Aironet AP or
bridge (in AP mode). The AP to which a WGB associates can treat the WGB as an infrastructure device or as
a simple client device. By default, APs and bridges treat WGBs as client devices. For increased reliability,
you can configure APs and bridges to treat WGBs, not as client devices, but as infrastructure devices, like
APs or bridges. When these devices treat a WGB as an infrastructure device, the AP reliably delivers
multicast packets, which include Address Resolution Protocol (ARP) packets, to the WGB. In order to
configure APs and bridges to treat WGBs as infrastructure devices, perform one of these two options on your
root AP:
bridge (in AP mode). The AP to which a WGB associates can treat the WGB as an infrastructure device or as
a simple client device. By default, APs and bridges treat WGBs as client devices. For increased reliability,
you can configure APs and bridges to treat WGBs, not as client devices, but as infrastructure devices, like
APs or bridges. When these devices treat a WGB as an infrastructure device, the AP reliably delivers
multicast packets, which include Address Resolution Protocol (ARP) packets, to the WGB. In order to
configure APs and bridges to treat WGBs as infrastructure devices, perform one of these two options on your
root AP:
CLI − Issue the infrastructure−client configuration command under the radio interface on the AP.
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GUI − Navigate to Network > Network Interface > Choose the correct interface > Settings and
enable reliable multicast.
enable reliable multicast.
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If you configure APs and bridges in order to treat a WGB as a client device, you allow more WGBs to
associate to the same AP or to associate with the use of a Service Set Identifier (SSID) that is not an
infrastructure SSID. The performance cost of reliable multicast delivery − in which the duplication of each
multicast packet is sent to each WGB − limits the number of infrastructure devices (which includes WGBs)
that can associate to an AP or bridge. In order to increase the number of WGBs that can associate to the AP
beyond 20, the AP must reduce the delivery reliability of multicast packets to WGBs. With reduced reliability,
the AP cannot confirm whether multicast packets reach the intended WGB. So WGBs at the edge of the AP
coverage area can lose IP connectivity.
associate to the same AP or to associate with the use of a Service Set Identifier (SSID) that is not an
infrastructure SSID. The performance cost of reliable multicast delivery − in which the duplication of each
multicast packet is sent to each WGB − limits the number of infrastructure devices (which includes WGBs)
that can associate to an AP or bridge. In order to increase the number of WGBs that can associate to the AP
beyond 20, the AP must reduce the delivery reliability of multicast packets to WGBs. With reduced reliability,
the AP cannot confirm whether multicast packets reach the intended WGB. So WGBs at the edge of the AP
coverage area can lose IP connectivity.