WESM zl Management and Configuration Guide WT.01.28 and greater

9-17
Fast Layer 2 Roaming and Layer 3 Mobility
Configuring Layer 3 Mobility
2. Specify a valid IP address on this Wireless Edge Services zl Module. You have
two options:
• Select Use Default Management Interface to use the address on the man-
agement VLAN.
• Select Use this Local Address and manually enter an IP address.
3. Optionally, change the value in the Roam Interval field.
4. A station that roams at Layer 3 must maintain its association with its HM. The
roam interval specifies how long the Wireless Edge Services zl Module stores a
station’s association after it loses contact with the station—giving the station’s
traffic time to tunnel back to it after a Layer 3 roam.
The roam interval is added to the station timeout for the WLAN in question. If
you have set this value low and if your Ethernet network is somewhat congested,
you might need to increase the roam interval.
You can set the interval from between 1 and 300 seconds. The default setting is
5 seconds.
5. The section at the bottom on the screen displays all WLANs on this module.
Check the boxes for the WLANs on which you want to enable Layer 3 mobility.
Enabled WLANs are displayed in boldface.
You can use the All WLANs On and All WLANs Off buttons to quickly select and
deselect WLANs.
You might see the screen shown in Figure 9-6 when you attempt to check a
WLAN’s box.
Figure 9-6. Dynamic VLAN Error
Dynamic VLAN assignment is incompatible with Layer 3 mobility. If the
WLAN requires Layer 3 mobility, you must access the WLAN’s Edit screen and
uncheck the Dynamic Assignment box. (See “Setting Basic Configuration
Options: SSID and VLAN Interface” on page 4-30 of Chapter 4: “Wireless Local
Area Networks (WLANs).”)
6. Click the Apply button.