Cisco Cisco Aironet 350 Wireless Bridge Manual Técnica
Connectivity ProblemsAP to Wired LAN
This document presents this topic on AP−to−wired LAN connectivity problems first because of the hierarchy
of the network. Often, RF connectivity between the AP and the client can indeed be fine, but in reality, traffic
flows from the client, through the AP, and out to the rest of the network. If there is a problem between the AP
and the rest of the LAN, the problem can go unrecognized until clients try to pass traffic through the AP, and
not just to the AP.
of the network. Often, RF connectivity between the AP and the client can indeed be fine, but in reality, traffic
flows from the client, through the AP, and out to the rest of the network. If there is a problem between the AP
and the rest of the LAN, the problem can go unrecognized until clients try to pass traffic through the AP, and
not just to the AP.
Filters
If there are any filters that are configured on either the Ethernet side or the radio side of the AP, disable them
temporarily, until you resolve the connectivity issue. This disablement helps to determine if the filters
contribute to the problem. You can disable filters from the interfaces while the filters remain a part of the
configuration. If the filters are long or complex, reenable them in phases in order to isolate the condition that
causes the problem. For information about how to enable filters in APs, refer to the Configuring Filters
section of Cisco IOS Software Configuration Guide for Cisco Aironet Access Points.
temporarily, until you resolve the connectivity issue. This disablement helps to determine if the filters
contribute to the problem. You can disable filters from the interfaces while the filters remain a part of the
configuration. If the filters are long or complex, reenable them in phases in order to isolate the condition that
causes the problem. For information about how to enable filters in APs, refer to the Configuring Filters
section of Cisco IOS Software Configuration Guide for Cisco Aironet Access Points.
IP Addressing
Although IP addressing is a basic issue, the subject requires comment. If the AP or wireless clients are
statically addressed, be sure that the static address is indeed in the same network as the rest of the LAN. The
AP communicates with rest of the network through the IP address assigned to the BVI interface. You must be
sure that the IP address is numbered similarly and has the same subnet mask. The AP is not a router and does
not perform any routing functions. Therefore, never consider the AP the default gateway of a network. Do not
configure the IP address of the AP on any device as the default gateway of that device.
statically addressed, be sure that the static address is indeed in the same network as the rest of the LAN. The
AP communicates with rest of the network through the IP address assigned to the BVI interface. You must be
sure that the IP address is numbered similarly and has the same subnet mask. The AP is not a router and does
not perform any routing functions. Therefore, never consider the AP the default gateway of a network. Do not
configure the IP address of the AP on any device as the default gateway of that device.
In most cases, the AP and clients obtain the IP address through DHCP. If the AP is configured to recieve the
IP address through DHCP but does not receive a valid response from the DHCP server, the AP does this:
IP address through DHCP but does not receive a valid response from the DHCP server, the AP does this:
Uses a default address of 10.0.0.1
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Reuses the last address that the DHCP server assigned the AP
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Thoroughly investigate a failure to receive a dynamic address. Be sure to check:
That the DHCP server service runs
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That the DHCP scope has not been exhausted
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That other wired clients on the same segment can be successfully addressed dynamically
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The characteristics and configuration of the port on the hub or switch to which the AP is connected
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The cabling between the AP and the switch
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The configuration of the Ethernet interface on the AP
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The Ethernet statistics on the transmit and receive sides of both of these:
The AP
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The port on the hub or switch to which the AP connects
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Note: See the Statistical Analysis section of this document for information on how to analyze the
Ethernet statistics.
Ethernet statistics.
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Root Versus Repeater Configuration
In the context of IEEE 802.11 networking and APs, as well as the relevant subset standards, a root device is
one that is physically connected to the wired LAN. If an AP is configured to be a repeater, the Ethernet
interface on that AP is disabled. This is by design and functions in accordance with standards. If inline power
is used, the power connections of the Ethernet interface are not disabled. You can see the status of the
one that is physically connected to the wired LAN. If an AP is configured to be a repeater, the Ethernet
interface on that AP is disabled. This is by design and functions in accordance with standards. If inline power
is used, the power connections of the Ethernet interface are not disabled. You can see the status of the