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HWC_AppendixC.fm
DHCP, SLP, and Option 78 reference
C
DHCP, SLP, and Option 78 reference
For the Wireless AP’s process to "discover" the HiPath Wireless Controller, the Controller,
Access Points and Convergence Software system relies on a DHCP server that supports
Option 78 and 79 for Service Location Protocol (SLP). The combination of Dynamic Host
Configuration Protocol (DHCP), Option 78 and 79, and SLP provide a technique that defines
the HiPath Wireless Controller as the only element on the network that the Wireless AP can
communicate with.
Option 78 is a list of IP addresses of Directory Agents, used by Service Agents and Users
Agents.
For the purposes of the Controller, Access Points and Convergence Software system, Option
78 should be set to the IP address of the HiPath Wireless Controller management port. The
HiPath Wireless Controller will run the SLP daemon and act as a directory service.
>
One of the ethernet ports on the HiPath Wireless Controller should be set to allow
management traffic so that SLP messages can arrive on that port.
Option 79 is an identifier that refers to a set of services called a "scope". If a User Agent has
been assigned to a scope, it can only see the services in that scope. This will limit the IP
addresses of Directory Agents available to the User Agent.
Here's how Controller, Access Points and Convergence Software uses these SLP options:
1.
The HiPath Wireless Controller Manager or the Wireless AP Manager use the Service
Agent:
●
to look up the location of the Directory Agent using Option 78 and 79 in the DHCP
server
●
to register with the Directory Agent
2.
The Wireless AP User Agent looks up the location of the Directory Agent using Option 78
and 79 in the DHCP server.
3.
The Wireless AP User Agent contacts the Directory Agent for services of the types
"Chantry".
4.
The Wireless AP attempts to connect with the HiPath Wireless Controller or Wireless AP
Manager.
Now the use of SLP is completed and the Wireless AP and HiPath Wireless Controller will now
communicate using a UDP-based tunneling protocol.
A31003-W1010-A100-1-7619, July 2005
HiPath Wireless Controller, Access Points and Convergence Software V3.0: User Guide
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