L2 Discovery; Ip Address Of Ap Configured In The Switch; Ip Address Of Switch Configured In The Ap - D-Link DWS-4026 User Manual

Software User Manual
12/10/09
The AP and the switch that should manage the AP cannot be separated by a Network Address Translation
(NAT) device. The AP and switch exchange each other's IP addresses in the payload of the discovery and
other messages. These addresses are then used for the subsequent communication between the switch
and the AP. As those addresses do not undergo translation, the switch and AP will fail to communicate.
However, the switch and the AP will have no such communication issues for remote sites or branch offices
that are connected by Virtual Private Network (VPN). VPN functionality is already commonly found on
firewalls. This issue can be resolved by setting up VPN access between the networks that use NAT.

L2 Discovery

When the AP and Unified Switch are directly connected or in the same layer 2 broadcast domain and use the default VLAN
settings, the Unified Switch automatically discovers the AP through its broadcast of a L2 discovery message. The L2
discovery works automatically when the devices are directly connected or connected by using a layer 2 bridge.
For more information about L2 Discovery, see

IP Address of AP Configured in the Switch

If APs are in a different broadcast domain than the Unified Switch or use different management VLANs, You can add the IP
addresses of the APs to the L3 Discovery list on the switch. The Unified Switch sends UDP discovery messages to the IP
addresses in its list. When the AP receives the messages and decides that it can connect to the switch, it initiates an SSL
TCP connection to the switch.
For more information about configuring the IP address of the AP in the switch, see

IP Address of Switch Configured in the AP

You can connect to the access point in Standalone mode and statically configure the IP addresses or DNS name of up to
four switches that are allowed to manage the AP.
The AP sends a UDP discovery message to the first IP address configured in its list. When the switch receives the message,
it verifies that the vendor ID on the AP is valid, there is no existing SSL TCP connection to the access point, and the
maximum number of managed APs has not been reached. If all these conditions are met then the switch sends an invitation
message to the AP to start the SSL TCP connection.
If the AP does not receive an invitation from the first Unified Switch configured in its list, it sends a UDP discovery message
to the second Unified Switch configured in the list five seconds after sending the message to the first Unified Switch.
When an IP address of a Unified Switch is configured on the AP, the AP only associates with that switch even if other
switches discover the AP by using other mechanisms.
For this method to work, the AP must be able to find a route to the Unified Switch.
To use the access point Web interface to configure the switch IP address information, use a Web browser to log onto the
AP and go to the Managed Access Point page. Enter the information into the available fields and click Update.
To use the CLI to configure the switch IP address information in the AP, use the following procedures:
1 Use a serial or Telnet connection to log on to the access point.
2 Use the
set managed-ap switch-address-<1–4>
Document 34CSFP6XXUWS-SWUM100-D7
"L2/VLAN Discovery" on page
to enter the IP address of up to four switches that are
D-Link Unified Access System
416.
"L3/IP Discovery" on page
D-Link Unified Access System Components
415.
Page 407