Configuring WSS System Parameters 203Nortel WLAN—Management Software 2300 Series Reference Guide• Uplink fast convergence—Uplink fast convergence enables a WSS that has redundant links to the network core toimmediately change the state of a backup link to forwarding if the primary link to the root fails. Uplink fastconvergence bypasses the listening and learning states to immediately enter the forwarding state.To enable fast convergence features:1 Access the VLAN table:a Select the Configuration tool bar option.b In the Organizer panel, click the plus sign next to the WSS.c Click the plus sign next to System.d Select VLANs.2 To switch to an alternate port if the root port fails, select Enable Uplink Fast.3 To enable the backbone fast convergence feature, select Enable Backbone Fast.4 Click Save.Changing VLAN IGMP SettingsInternet Group Management Protocol (IGMP) snooping controls multicast traffic on an WSS by forwarding packets fora multicast group only on the ports that are connected to members of the group. IGMP is especially useful for WLANsbecause bandwidth is relatively constrained. The WSS listens for multicast packets and maintains a table of multicastgroups, as well as their sources and receivers, based on the traffic. IGMP snooping is enabled by default.You can configure IGMP snooping parameters and enable or disable the feature on an individual VLAN basis.The current software version supports IGMP versions 1 and 2.To configure IGMP snooping:1 Access the VLAN table:a Select the Configuration tool bar option.b In the Organizer panel, click the plus sign next to the WSS.c Click the plus sign next to System.d Select VLANs.2 In the Content panel, select the VLAN.3 In the Task List panel, select IGMP.4 To enable IGMP snooping, select Enable. To disable IGMP snooping, clear Enable. By default, IGMPsnooping is enabled.5 In the Version list, select Version 1 or Version 2 of IGMP.Note. The uplink fast convergence feature is applicable to bridges that areacting as access switches to the network core (distribution layer) but are not in thecore themselves. Do not enable the feature on WSS switches that are in thenetwork core.
