Extreme Networks Summit WM User Manual page 160

WM Access Domain Services configuration
Defining a next hop route and OSPF advertisement for a WM-AD
The next hop definition allows the administrator to define a specific host as the target for all non-WM-
AD targeted traffic for users in a WM-AD. The next hop IP identifies the target device to which all WM-
AD (user traffic) will be forwarded to. Next-hop definition supersedes any other possible definition in
the routing table.
If the traffic destination from a wireless device on a WM-AD is outside of the WM-AD, it is forwarded
to the next hop IP address, where this router applies policy and forwards the traffic. This feature applies
to unicast traffic only. In addition, you can also modify the Open Shortest Path First (OSPF) route cost.
OSPF is an interior gateway routing protocol developed for IP networks based on the shortest path first
or link-state algorithm. Using OSPF, a host that obtains a change to a routing table or detects a change
in the network immediately distributes the information to all other hosts in the network so that all will
have the same routing table information. The host using OSPF sends only the part that has changed,
and only when a change has taken place.
To define a next hop route and OSPF advertisement:
1 From the main menu, click WM Access Domain Configuration. The WM Access Domain
Configuration page is displayed.
2 In the left pane WM Access Domains list, click the WM-AD you want to define a next-hop route for.
The Topology tab is displayed.
3 In the Next Hop Address box, type the IP address of the next hop router on the network through
which you wish all traffic on this WM-AD to be directed.
4 In the OSPF Route Cost box, type the OSPF cost of reaching the WM-AD subnet.
The OSPF cost value provides a relative cost indication to allow upstream routers to calculate
whether or not to use the controller as a better fit or lowest cost path to reach devices in a particular
network. The higher the cost, the less likely of the possibility that the controller will be chosen as a
route for traffic, unless that controller is the only possible route for that traffic.
5 To disable OSPF advertisement on this WM-AD, select the disable OSPF Advertisement checkbox.
Defining the IP address for the WM-AD (for the DHCP server on the controller)
Bridged at the AP WM-ADs do not require the definition of a corresponding IP address definition for
the WM-AD since all traffic for users in that WM-AD will be directly bridged by the AP at the local
network point of attachment (VLAN at AP port).
The IP address definition is only required for a routed WM-AD or VLAN bridged WM-AD.
To define the IP address for the WM-AD:
1 From the main menu, click WM Access Domain Configuration. The WM Access Domain
Configuration page is displayed.
2 In the left pane WM Access Domains list, click the WM-AD you want to define the IP address for.
The Topology tab is displayed.
3 In the Gateway box, type the Summit WM Controller's own IP address in that WM-AD.
This IP address is the default gateway for the WM-AD. The Summit WM Controller advertises this
address to the wireless devices when they sign on. For routed WM-ADs, it corresponds to the IP
address that is communicated to MUs (in the WM-AD) as the default gateway for the WM-AD
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Summit WM User Guide, Software Version 5.3