ProSoft Technology RLXIB-IHA-A - Manual (Page 52)

Radio Configuration / Diagnostic Utility RLXIB-IHA ♦ 802.11a
User Manual RadioLinx® 802.11a Industrial Hotspot
Page 52 of 123 ProSoft Technology, Inc.
July 25, 2013
RLXIB-IHA radios support IGMP v1 and v2. The default operation of the RLXIB-
IHA radios is to have IGMP functionality enabled, although the user can disable
IGMP entirely. Additionally, the user can specify settings associated with IGMP
filtering and snooping. Unknown multicast addresses can be sent to all ports
(flood) or to none (filtered) by changing the IGMP Multicast Filtering option. The
user can specify whether the radio will generate IGMP queries, and configure the
query interval time.
By RFC specification, only one device on a network should generate IGMP
queries. As such, RLXIB-IHA radios will only send a query if another device has
not sent a query within its Query Interval setting, even if Query Generation is
enabled.
Field Description
IGMP Multicast Filtering Disabling filtering will cause the radio flood multicast packets to all
ports.
Default Propagation
Action Determines how to handle multicast addresses that are not in the
radio’s address table.
IGMP Query Generation Enables or disables query generation from this radio.
IGMP Query Interval Number of seconds between queries (if not pre-emptied by another
devices queries).
Multicast State Count Number of queries generated before a device is removed from the
multicast group on this radio if no response is received.
Save Saves your changes and updates the radio configuration.
Cancel Discards your changes without updating the radio configuration.
4.2.3 Rapid Spanning Tree Functionality
The software’s built-in Rapid Spanning Tree (RSTP) functionality enables you to
set up full redundancy between radios or other devices. Spanning Tree shuts off
ports as necessary to prevent loops. If loops are created in an Ethernet network,
packets can be circulated endlessly, consuming all the bandwidth and making
the network unusable.
RSTP allows users to create truly redundant connections between any two points
in the network. The radios detect the redundant paths and keep one connection
alive for communications. If the primary connection fails for any reason, the
secondary connection is quickly transitioned to a state to forward packets,
allowing the network to adapt itself to handle problems without customer
intervention.
RSTP uses active communications between network devices to propagate
changes in the network and to cause transitions to occur much more quickly.
Because RSTP is an IEEE standard, IH radios work in conjunction with wired
Ethernet switches to form a redundant network.