General Options; Summit Wm Access Point Discovery Mechanism - Extreme Networks Summit WM Technical Reference Manual

General options

Line 1 designates this DHCP server as authoritative in case another DHCP server answers requests.
Line 2 sets options for Dynamic DNS. This option turns off DNS updates based upon DHCP mappings.
There are other options that allow DHCP to update a DNS server to reflect the addresses handed out by
the DHCP server. See the man page for dhcpd.conf for more information on support for this option.
Line 3 defines the format for DHCP option 151 as we want to use it. The phones being used on one of
the wireless networks in this example require this option to find their voice gateway. Since the Summit
WM Controller does not allow for custom options this is the perfect place to insert this option.
Scope 10.0.0.0/24 (lines 4-8)
This scope is primarily defined to allow APs deployed in the same subnet to acquire an IP address. Also
defined in this subnet is the option slp-directory-agent – this is option number 78 and allows the APs to
find the Summit WM Controller by Service Location Protocol. It also allows a multiple Summit WM
Controller setup that includes availability and mobility.
Notice that the static addresses in the topology use host addresses whose last octet is less than 50. The
definition in the file specifically will address APs only from address 50-254 within this subnet. Thus, the
static addresses used by the infrastructure elements are protected from use by the DHCP-enabled APs.
Scope 172.16.1.0/24 (lines 9-18)
This scope is defined to address wireless handsets. Notice the use of option 151 (now called 'svp' within
the scope). Delivery of this option would be impossible from the Summit WM Controller itself but it can
be delivered through DHCP relay. The other options are self-explanatory.
Scope 172.16.2.0/24 (line 19-27)
This scope is defined to address general wireless devices using a separate SSID on the same system that
the voice clients are deployed on. The options within this scope are very simple – see the dhcpd.conf
and dhcpd-options man pages within Linux to review the variety of options that are available to be
handed out to DHCP clients within your network.

Summit WM Access Point Discovery mechanism

The following outlines an advanced version of our Summit WM Access Point discovery mechanism.
Note that this document only applies to the mechanism for discovering the IP address or addresses of
the Summit WM Controller or set of Summit WM Controllers that may provide service to a particular
Wireless AP. It does not include a description of or make any assumptions about the mechanism to
"connect" to a Summit WM Controller or of any failover scenarios for Summit WM Controller
connection.
25
Summit WM Technical Reference Guide, Software Version 5.1